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Vendor Name : CPP-Institute
Exam Code : PCAP-31-02
Exam Name : PCAP Certified Associate in Python Programming
Questions and Answers : 40 Q & A
Updated On : April 18, 2019
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PCAP-31-02 PCAP Certified Associate in Python Programming

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PCAP-31-02 exam Dumps Source : PCAP Certified Associate in Python Programming

Test Code : PCAP-31-02
Test Name : PCAP Certified Associate in Python Programming
Vendor Name : CPP-Institute
Q&A : 40 Real Questions

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Middletown, Conn.—Middlesex community school is completely happy to announce that the fitness counsel administration certificate application has been authorized through the professional certificates Approval program (PCAP) Council of the American fitness tips management affiliation (AHIMA) as of January 2018. The PCAP approval identifies scientific coding schooling classes which have been evaluated through a peer overview manner against national minimum specifications for entry-stage coding authorities. This approval procedure enables educational associations to be acknowledged as offering an authorised coding certificate software. Middlesex is the handiest neighborhood school in Connecticut with this distinction.

"On the counsel of our advisory board, we developed the coding-intensive fitness information management certificates to handle the unmet demand for coding specialists in Connecticut," explained Jill Flanigan, coordinator of the program at Middlesex. "AHIMA PCAP approval of our certificate creates new opportunities for skilled certification for our college students so that you can open up these career alternatives to them. The approval puts us in a more robust place to serve both our college students and the employers in our neighborhood."

fitness care corporations depend on correct and expert coding professionals because it impacts revenues and fitness consequences. This designation assures them that certificate holders of the Middlesex group school HIM certificate coding program possess the necessary job abilities to acquire success in entry-degree coding positions. students are guided through a 30-credit score finished coding curriculum proposing them with instruction in ICD-10-CM/PCS coding and CPT coding and compensation methodologies.

college students who comprehensive PCAP-authorised courses are eligible for the CCA (certified Coding associate), the CCS (certified Coding professional), and CCS-P (certified Coding specialist—surgeon's workplace) examinations. These credentials set them apart with abilities that employers are trying to find, leading to accelerated earnings and career enhancement.

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fitted with 18.5 and 15 in. LCDs, respectively, models ASTUT-1811S-computer and ASTUT-1511S-notebook utilize dual-core 1.86 GHz Intel® Atom™ processor D2550 in fanless enclosure with 4 GB DDR3 reminiscence and PCI enlargement slot. gadgets have vandal-proof projected capacitive touchscreen with three mm glass that helps multi-touch operation and offers light transmission rating up to ninety%. further facets consist of 2.5 in. HDD bay and a pair of remoted RS-232/422/485 selectable serial ports.

original Press free up: IBASE Unveils New ASTUT All-in-one Panel notebook sequence

Taipei, Taiwan, - IBASE technology Inc. (TASDAQ: 8050), an international-main manufacturer of industrial motherboards and embedded methods, unveils the new panel computing device collection - ASTUT, comprising all-in-one panel PCs with 18.5” (ASTUT-1811S-laptop) or 15” (ASTUT-1511S-laptop) lcd screen. the new collection makes use of the dual-core 1.86GHz Intel® Atom™ Processor D2550 in a fanless enclosure it really is geared up with a PCI growth slot to deliver high-computing and respectable efficiency.

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ASTUT-1811S-computing device/ASTUT-1511S-computing device aspects:

• 18.5”(16:9)/15”(four:3) industrial-grade liquid crystal display panel

• Aluminum front bezel, IP65 rated

• Vandal-proof projected capacitive touch screen

• twin-Core Intel® Atom™ Processor D2550

• 4GB DDR3 memory

• with ease available 2.5” HDD bay

• CFast slot as second storage

• 12V~36V DC vast-latitude vigor input

• One PCI expansion slot

About IBASE technology

established in 2000, IBASE expertise (TASDAQ: 8050) is an ISO 9001, ISO 13485 and ISO 14001 licensed company that specializes within the design and manufacturing of business notebook items. IBASE gives OEM/ODM capabilities tailoring products to clients' necessities. current product choices from IBASE consist of single board computers, Mini-ITX boards, Disk-dimension SBC, COM specific CPU modules, embedded programs, panel computers and community equipment for various functions in the automation, digital signage, gaming, entertainment, scientific, armed forces and networking markets. IBASE is committed to offering inventive, purposeful and reliable solutions for an ever-evolving industrial computing landscape. For more assistance, please consult with www.ibase.com.tw.

IBASE is an affiliate member of the Intel® information superhighway of issues options Alliance. From modular add-ons to market-capable programs, Intel and the 250+ global member corporations of the Intel® web of issues options Alliance supply scalable, interoperable solutions that speed up deployment of clever contraptions and conclusion-to-conclusion analytics. shut collaboration with Intel and each different enables Alliance contributors to innovate with the latest applied sciences, helping developers carry first-in-market solutions. be trained extra at: intel.com/IoTSolutionsAlliance.

Contact assistance:

IBASE know-how Inc.

11F, No. three-1, Yuan Qu St., Nankang, Taipei, Taiwan, R.O.C. (Nankang software Park)

Tel: 886-2-26557588     Fax: 886-2-26557388

electronic mail: income@ibase.com.tw

www.ibase.com.tw

Intel and Intel Atom are emblems of Intel agency within the united states and different nations.

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Media Contact:

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Sulley: Fuzzing Framework | killexams.com real questions and Pass4sure dumps

This chapter is from the book 

Sulley is a fuzzer development and fuzz testing framework consisting of multiple extensible components. Sulley (in our humble opinion) exceeds the capabilities of most previously published fuzzing technologies, both commercial and those in the public domain. The goal of the framework is to simplify not only data representation, but data transmission and target monitoring as well. Sulley is affectionately named after the creature from Monsters, Inc.26 because, well, he is fuzzy. You can download the latest version of Sulley from http://www.fuzzing.org/sulley.

Modern-day fuzzers are, for the most part, solely focused on data generation. Sulley not only has impressive data generation, but has taken this a step further and includes many other important aspects a modern fuzzer should provide. Sulley watches the network and methodically maintains records. Sulley instruments and monitors the health of the target, and is capable of reverting to a good state using multiple methods. Sulley detects, tracks, and categorizes detected faults. Sulley can fuzz in parallel, significantly increasing test speed. Sulley can automatically determine what unique sequence of test cases triggers faults. Sulley does all this and more, automatically, and without attendance. Overall usage of Sulley breaks down to the following:

  • Data representation: This is the first step in using any fuzzer. Run your target and tickle some interfaces while snagging the packets. Break down the protocol into individual requests and represent them as blocks in Sulley.
  • Session: Link your developed requests together to form a session, attach the various available Sulley monitoring agents (socket, debugger, etc.), and commence fuzzing.
  • Postmortem: Review the generated data and monitored results. Replay individual test cases.
  • Once you have downloaded the latest Sulley package from http://www.fuzzing.org, unpack it to a directory of your choosing. The directory structure is relatively complex, so let's take a look at how everything is organized.

    Sulley Directory Structure

    There is some rhyme and reason to the Sulley directory structure. Maintaining the directory structure will ensure that everything remains organized while you expand the fuzzer with Legos, requests, and utilities. The following hierarchy outlines what you will need to know about the directory structure:

  • archived_fuzzies: This is a free-form directory, organized by fuzz target name, to store archived fuzzers and data generated from fuzz sessions.
  • trend_server_protect_5168: This retired fuzz is referenced during the step-by-step walk-through later in this document.
  • trillian_jabber: Another retired fuzz referenced from the documentation.
  • audits: Recorded PCAPs, crash bins, code coverage, and analysis graphs for active fuzz sessions should be saved to this directory. Once retired, recorded data should be moved to archived_fuzzies.
  • docs: This is documentation and generated Epydoc API references.
  • requests: Library of Sulley requests. Each target should get its own file, which can be used to store multiple requests.
  • __REQUESTS__.html: This file contains the descriptions for stored request categories and lists individual types. Maintain alphabetical order.
  • http.py: Various Web server fuzzing requests.
  • trend.py: Contains the requests associated with the complete fuzz walkthrough discussed later in this document.
  • sulley: The fuzzer framework. Unless you want to extend the framework, you shouldn't need to touch these files.
  • legos: User-defined complex primitives.
  • ber.py: ASN.1/BER primitives.
  • dcerpc.py: Microsoft RPC NDR primitives.
  • misc.py: Various uncategorized complex primitives such as e-mail addresses and hostnames.
  • xdr.py: XDR types.
  • pgraph: Python graph abstraction library. Utilized in building sessions.
  • utils: Various helper routines.
  • dcerpc.py: Microsoft RPC helper routines such as for binding to an interface and generating a request.
  • misc.py: Various uncategorized routines such as CRC-16 and UUID manipulation routines.
  • scada.py: SCADA-specific helper routines including a DNP3 block encoder.
  • __init__.py: The various s_ aliases that are used in creating requests are defined here.
  • blocks.py: Blocks and block helpers are defined here.
  • pedrpc.py: This file defines client and server classes that are used by Sulley for communications between the various agents and the main fuzzer.
  • primitives.py: The various fuzzer primitives including static, random, strings, and integers are defined here.
  • sessions.py: Functionality for building and executing a session.
  • sex.py: Sulley's custom exception handling class.
  • unit_tests: Sulley's unit testing harness.
  • utils: Various stand-alone utilities.
  • crashbin_explorer.py: Command-line utility for exploring the results stored in serialized crash bin files.
  • pcap_cleaner.py: Command-line utility for cleaning out a PCAP directory of all entries not associated with a fault.
  • network_monitor.py: PedRPC-driven network monitoring agent.
  • process_monitor.py: PedRPC-driven debugger-based target monitoring agent.
  • unit_test.py: Sulley's unit testing harness.
  • vmcontrol.py: PedRPC-driven VMWare controlling agent.
  • Now that the directory structure is a bit more familiar, let's take a look at how Sulley handles data representation. This is the first step in constructing a fuzzer.

    Data Representation

    Aitel had it right with SPIKE: We've taken a good look at every fuzzer we can get our hands on and the block-based approach to protocol representation stands above the others, combining both simplicity and the flexibility to represent most protocols. Sulley utilizes a block-based approach to generate individual requests, which are then later tied together to form a session. To begin, initialize with a new name for your request:

    s_initialize("new request")

    Now you start adding primitives, blocks, and nested blocks to the request. Each primitive can be individually rendered and mutated. Rendering a primitive returns its contents in raw data format. Mutating a primitive transforms its internal contents. The concepts of rendering and mutating are abstracted from fuzzer developers for the most part, so don't worry about it. Know, however, that each mutatable primitive accepts a default value that is restored when the fuzzable values are exhausted.

    Static and Random Primitives

    Let's begin with the simplest primitive, s_static(), which adds a static unmutating value of arbitrary length to the request. There are various aliases sprinkled throughout Sulley for your convenience, s_dunno(), s_raw(), and s_unknown() are aliases of s_static():

    # these are all equivalent: s_static("pedram\x00was\x01here\x02") s_raw("pedram\x00was\x01here\x02") s_dunno("pedram\x00was\x01here\x02") s_unknown("pedram\x00was\x01here\x02")

    Primitives, blocks, and so on all take an optional name keyword argument. Specifying a name allows you to access the named item directly from the request via request.names["name"] instead of having to walk the block structure to reach the desired element. Related to the previous, but not equivalent, is the s_binary() primitive, which accepts binary data represented in multiple formats. SPIKE users will recognize this API, as its functionality is (or rather should be) equivalent to what you are already familiar with:

    # yeah, it can handle all these formats. s_binary("0xde 0xad be ef \xca fe 00 01 02 0xba0xdd f0 0d")

    Most of Sulley's primitives are driven by fuzz heuristics and therefore have a limited number of mutations. An exception to this is the s_random() primitive, which can be utilized to generate random data of varying lengths. This primitive takes two mandatory arguments, 'min_length' and 'max_length', specifying the minimum and maximum length of random data to generate on each iteration, respectively. This primitive also accepts the following optional keyword arguments:

  • num_mutations (integer, default=25): Number of mutations to make before reverting to default.
  • fuzzable (boolean, default=True): Enable or disable fuzzing of this primitive.
  • name (string, default=None): As with all Sulley objects, specifying a name gives you direct access to this primitive throughout the request.
  • The num_mutations keyword argument specifies how many times this primitive should be rerendered before it is considered exhausted. To fill a static sized field with random data, set the values for 'min_length' and 'max_length' to be the same.

    Integers

    Binary and ASCII protocols alike have various-sized integers sprinkled all throughout them, for instance the Content-Length field in HTTP. Like most fuzzing frameworks, a portion of Sulley is dedicated to representing these types:

  • one byte: s_byte(), s_char()
  • two bytes: s_word(), s_short()
  • four bytes: s_dword(), s_long(), s_int()
  • eight bytes: s_qword(), s_double()
  • The integer types each accept at least a single parameter, the default integer value. Additionally the following optional keyword arguments can be specified:

  • endian (character, default='<'): Endianess of the bit field. Specify < for little endian and > for big endian.
  • format (string, default="binary"): Output format, "binary" or "ascii," controls the format in which the integer primitives render. For example, the value 100 is rendered as "100" in ASCII and "\x64" in binary.
  • signed (boolean, default=False): Make size signed versus unsigned, applicable only when format="ascii".
  • full_range (boolean, default=False): If enabled, this primitive mutates through all possible values (more on this later).
  • fuzzable (boolean, default=True): Enable or disable fuzzing of this primitive.
  • name (string, default=None): As with all Sulley objects specifying a name gives you direct access to this primitive throughout the request.
  • The full_range modifier is of particular interest among these. Consider you want to fuzz a DWORD value; that's 4,294,967,295 total possible values. At a rate of 10 test cases per second, it would take 13 years to finish fuzzing this single primitive! To reduce this vast input space, Sulley defaults to trying only "smart" values. This includes the plus and minus 10 border cases around 0, the maximum integer value (MAX_VAL), MAX_VAL divided by 2, MAX_VAL divided by 3, MAX_VAL divided by 4, MAX_VAL divided by 8, MAX_VAL divided by 16, and MAX_VAL divided by 32. Exhausting this reduced input space of 141 test cases requires only seconds.

    Strings and Delimiters

    Strings can be found everywhere. E-mail addresses, hostnames, usernames, passwords, and more are all examples of string components you will no doubt come across when fuzzing. Sulley provides the s_string() primitive for representing these fields. The primitive takes a single mandatory argument specifying the default, valid value for the primitive. The following additional keyword arguments can be specified:

  • size (integer, default=-1). Static size for this string. For dynamic sizing, leave this as -1.
  • padding (character, default='\x00'). If an explicit size is specified and the generated string is smaller than that size, use this value to pad the field up to size.
  • encoding (string, default="ascii"). Encoding to use for string. Valid options include whatever the Python str.encode() routine can accept. For Microsoft Unicode strings, specify "utf_16_le".
  • fuzzable (boolean, default=True). Enable or disable fuzzing of this primitive.
  • name (string, default=None). As with all Sulley objects, specifying a name gives you direct access to this primitive throughout the request.
  • Strings are frequently parsed into subfields through the use of delimiters. The space character, for example, is used as a delimiter in the HTTP request GET /index.html HTTP/1.0. The front slash (/) and dot (.) characters in that same request are also delimiters. When defining a protocol in Sulley, be sure to represent delimiters using the s_delim() primitive. As with other primitives, the first argument is mandatory and used to specify the default value. Also as with other primitives, s_delim() accepts the optional 'fuzzable' and 'name' keyword arguments. Delimiter mutations include repetition, substitution, and exclusion. As a complete example, consider the following sequence of primitives for fuzzing the HTML body tag.

    # fuzzes the string: <BODY bgcolor="black"> s_delim("<") s_string("BODY") s_delim(" ") s_string("bgcolor") s_delim("=") s_delim("\"") s_string("black") s_delim("\"") s_delim(">") Blocks

    Having mastered primitives, let's next take a look at how they can be organized and nested within blocks. New blocks are defined and opened with s_block_start() and closed with s_block_end(). Each block must be given a name, specified as the first argument to s_block_start(). This routine also accepts the following optional keyword arguments:

  • group (string, default=None). Name of group to associate this block with (more on this later).
  • encoder (function pointer, default=None). Pointer to a function to pass rendered data to prior to returning it.
  • dep (string, default=None). Optional primitive whose specific value on which this block is dependent.
  • dep_value (mixed, default=None). Value that field dep must contain for block to be rendered.
  • dep_values (list of mixed types, default=[]). Values that field dep can contain for block to be rendered.
  • dep_compare (string, default="=="). Comparison method to apply to dependency. Valid options include: ==, !=, >, >=, <, and <=.
  • Grouping, encoding, and dependencies are powerful features not seen in most other frameworks and they deserve further dissection.

    Groups

    Grouping allows you to tie a block to a group primitive to specify that the block should cycle through all possible mutations for each value within the group. The group primitive is useful, for example, for representing a list of valid opcodes or verbs with similar argument structures. The primitive s_group() defines a group and accepts two mandatory arguments. The first specifies the name of the group and the second specifies the list of possible raw values to iterate through. As a simple example, consider the following complete Sulley request designed to fuzz a Web server:

    # import all of Sulley's functionality. from sulley import * # this request is for fuzzing: {GET,HEAD,POST,TRACE} /index.html HTTP/1.1 # define a new block named "HTTP BASIC". s_initialize("HTTP BASIC") # define a group primitive listing the various HTTP verbs we wish to fuzz. s_group("verbs", values=["GET", "HEAD", "POST", "TRACE"]) # define a new block named "body" and associate with the above group. if s_block_start("body", group="verbs"): # break the remainder of the HTTP request into individual primitives. s_delim(" ") s_delim("/") s_string("index.html") s_delim(" ") s_string("HTTP") s_delim("/") s_string("1") s_delim(".") s_string("1") # end the request with the mandatory static sequence. s_static("\r\n\r\n") # close the open block, the name argument is optional here. s_block_end("body")

    The script begins by importing all of Sulley's components. Next a new request is initialized and given the name HTTP BASIC. This name can later be referenced for accessing this request directly. Next, a group is defined with the name verbs and the possible string values GET, HEAD, POST, and TRACE. A new block is started with the name body and tied to the previously defined group primitive through the optional group keyword argument. Note that s_block_start() always returns True, which allows you to optionally "tab out" its contained primitives using a simple if clause. Also note that the name argument to s_block_end() is optional. These framework design decisions were made purely for aesthetic purposes. A series of basic delimiter and string primitives are then defined within the confinements of the body block and the block is closed. When this defined request is loaded into a Sulley session, the fuzzer will generate and transmit all possible values for the block body, once for each verb defined in the group.

    Encoders

    Encoders are a simple, yet powerful block modifier. A function can be specified and attached to a block to modify the rendered contents of that block prior to return and transmission over the wire. This is best explained with a real-world example. The DcsProcessor.exe daemon from Trend Micro Control Manager listens on TCP port 20901 and expects to receive data formatted with a proprietary XOR encoding routine. Through reverse engineering of the decoder, the following XOR encoding routine was developed:

    def trend_xor_encode (str): key = 0xA8534344 ret = "" # pad to 4 byte boundary. pad = 4 - (len(str) % 4) if pad == 4: pad = 0 str += "\x00" * pad while str: dword = struct.unpack("<L", str[:4])[0] str = str[4:] dword ^= key ret += struct.pack("<L", dword) key = dword return ret

    Sulley encoders take a single parameter, the data to encode, and return the encoded data. This defined encoder can now be attached to a block containing fuzzable primitives, allowing the fuzzer developer to continue as if this little hurdle never existed.

    Dependencies

    Dependencies allow you to apply a conditional to the rendering of an entire block. This is accomplished by first linking a block to a primitive on which it will be dependent using the optional dep keyword parameter. When the time comes for Sulley to render the dependent block, it will check the value of the linked primitive and behave accordingly. A dependent value can be specified with the dep_value keyword parameter. Alternatively, a list of dependent values can be specified with the dep_values keyword parameter.

    Finally, the actual conditional comparison can be modified through the dep_compare keyword parameter. For example, consider a situation where depending on the value of an integer, different data is expected:

    s_short("opcode", full_range=True) # opcode 10 expects an authentication sequence. if s_block_start("auth", dep="opcode", dep_value=10): s_string("USER") s_delim(" ") s_string("pedram") s_static("\r\n") s_string("PASS") s_delim(" ") s_delim("fuzzywuzzy") s_block_end() # opcodes 15 and 16 expect a single string hostname. if s_block_start("hostname", dep="opcode", dep_values=[15, 16]): s_string("pedram.openrce.org") s_block_end() # the rest of the opcodes take a string prefixed with two underscores. if s_block_start("something", dep="opcode", dep_values=[10, 15, 16], dep_compare="!="): s_static("__") s_string("some string") s_block_end()

    Block dependencies can be chained together in any number of ways, allowing for powerful (and unfortunately complex) combinations.

    Block Helpers

    An important aspect of data generation that you must become familiar with to effectively utilize Sulley is the block helper. This category includes sizers, checksums, and repeaters.

    Sizers

    SPIKE users will be familiar with the s_sizer() (or s_size()) block helper. This helper takes the block name to measure the size of as the first parameter and accepts the following additional keyword arguments:

  • length (integer, default=4). Length of size field.
  • endian (character, default='<'). Endianess of the bit field. Specify '<' for little endian and '>' for big endian.
  • format (string, default="binary"). Output format, "binary" or "ascii", controls the format in which the integer primitives render.
  • inclusive (boolean, default=False). Should the sizer count its own length?
  • signed (boolean, default=False). Make size signed versus unsigned, applicable only when format="ascii".
  • fuzzable (boolean, default=False). Enable or disable fuzzing of this primitive.
  • name (string, default=None). As with all Sulley objects, specifying a name gives you direct access to this primitive throughout the request.
  • Sizers are a crucial component in data generation that allow for the representation of complex protocols such as XDR notation, ASN.1, and so on. Sulley will dynamically calculate the length of the associated block when rendering the sizer. By default, Sulley will not fuzz size fields. In many cases this is the desired behavior; in the event it isn't, however, enable the fuzzable flag.

    Checksums

    Similar to sizers, the s_checksum() helper takes the block name to calculate the checksum of as the first parameter. The following optional keyword arguments can also be specified:

  • algorithm (string or function pointer, default="crc32"). Checksum algorithm to apply to target block (crc32, adler32, md5, sha1).
  • endian (character, default='<'). Endianess of the bit field. Specify '<' for little endian and '>' for big endian.
  • length (integer, default=0). Length of checksum, leave as 0 to autocalculate.
  • name (string, default=None). As with all Sulley objects, specifying a name gives you direct access to this primitive throughout the request.
  • The algorithm argument can be one of crc32, adler32, md5, or sha1. Alternatively, you can specify a function pointer for this parameter to apply a custom checksum algorithm.

    Repeaters

    The s_repeat() (or s_repeater()) helper is used for replicating a block a variable number of times. This is useful, for example, when testing for overflows during the parsing of tables with multiple elements. This helper takes three mandatory arguments: the name of the block to be repeated, the minimum number of repetitions, and the maximum number of repetitions. Additionally, the following optional keyword arguments are available:

  • step (integer, default=1). Step count between min and max reps.
  • fuzzable (boolean, default=False). Enable or disable fuzzing of this primitive.
  • name (string, default=None). As with all Sulley objects, specifying a name gives you direct access to this primitive throughout the request.
  • Consider the following example that ties all three of the introduced helpers together. We are fuzzing a portion of a protocol that contains a table of strings. Each entry in the table consists of a two-byte string type field, a two-byte length field, a string field, and finally a CRC-32 checksum field that is calculated over the string field. We don't know what the valid values for the type field are, so we'll fuzz that with random data. Here is what this portion of the protocol might look like in Sulley:

    # table entry: [type][len][string][checksum] if s_block_start("table entry"): # we don't know what the valid types are, so we'll fill this in with random data. s_random("\x00\x00", 2, 2) # next, we insert a sizer of length 2 for the string field to follow. s_size("string field", length=2) # block helpers only apply to blocks, so encapsulate the string primitive in one. if s_block_start("string field"): # the default string will simply be a short sequence of Cs. s_string("C" * 10) s_block_end() # append the CRC-32 checksum of the string to the table entry. s_checksum("string field") s_block_end() # repeat the table entry from 100 to 1,000 reps stepping 50 elements on each iteration. s_repeat("table entry", min_reps=100, max_reps=1000, step=50)

    This Sulley script will fuzz not only table entry parsing, but might discover a fault in the processing of overly long tables.

    Legos

    Sulley utilizes legos for representing user-defined components such as e-mail addresses, hostnames, and protocol primitives used in Microsoft RPC, XDR, ASN.1, and others. In ASN.1 / BER strings are represented as the sequence [0x04][0x84][dword length][string]. When fuzzing an ASN.1-based protocol, including the length and type prefixes in front of every string can become cumbersome. Instead we can define a lego and reference it:

    s_lego("ber_string", "anonymous")

    Every lego follows a similar format with the exception of the optional options keyword argument, which is specific to individual legos. As a simple example, consider the definition of the tag lego, helpful when fuzzing XMLish protocols:

    class tag (blocks.block): def __init__ (self, name, request, value, options={}): blocks.block.__init__(self, name, request, None, None, None, None) self.value = value self.options = options if not self.value: raise sex.error("MISSING LEGO.tag DEFAULT VALUE") # # [delim][string][delim] self.push(primitives.delim("<")) self.push(primitives.string(self.value)) self.push(primitives.delim(">"))

    This example lego simply accepts the desired tag as a string and encapsulates it within the appropriate delimiters. It does so by extending the block class and manually adding the tag delimiters and user-supplied string to the block via self.push().

    Here is another example that produces a simple lego for representing ASN.1/ BER27 integers in Sulley. The lowest common denominator was chosen to represent all integers as four-byte integers that follow the form: [0x02][0x04][dword], where 0x02 specifies integer type, 0x04 specifies the integer is four bytes long, and the dword represents the actual integer we are passing. Here is what the definition looks like from sulley\legos\ber.py:

    class integer (blocks.block): def __init__ (self, name, request, value, options={}): blocks.block.__init__(self, name, request, None, None, None, None) self.value = value self.options = options if not self.value: raise sex.error("MISSING LEGO.ber_integer DEFAULT VALUE") self.push(primitives.dword(self.value, endian=">")) def render (self): # let the parent do the initial render. blocks.block.render(self) self.rendered = "\x02\x04" + self.rendered return self.rendered

    Similar to the previous example, the supplied integer is added to the block stack with self.push(). Unlike the previous example, the render() routine is overloaded to prefix the rendered contents with the static sequence \x02\x04 to satisfy the integer representation requirements previously described. Sulley grows with the creation of every new fuzzer. Developed blocks and requests expand the request library and can be easily referenced and used in the construction of future fuzzers. Now it's time to take a look at building a session.

    Session

    Once you have defined a number of requests it's time to tie them together in a session. One of the major benefits of Sulley over other fuzzing frameworks is its capability of fuzzing deep within a protocol. This is accomplished by linking requests together in a graph. In the following example, a sequence of requests are tied together and the pgraph library, which the session and request classes extend from, is leveraged to render the graph in uDraw format as shown in Figure 21.2:

    from sulley import * s_initialize("helo") s_static("helo") s_initialize("ehlo") s_static("ehlo") s_initialize("mail from") s_static("mail from") s_initialize("rcpt to") s_static("rcpt to") s_initialize("data") s_static("data") sess = sessions.session() sess.connect(s_get("helo")) sess.connect(s_get("ehlo")) sess.connect(s_get("helo"), s_get("mail from")) sess.connect(s_get("ehlo"), s_get("mail from")) sess.connect(s_get("mail from"), s_get("rcpt to")) sess.connect(s_get("rcpt to"), s_get("data")) fh = open("session_test.udg", "w+") fh.write(sess.render_graph_udraw()) fh.close()

    When it comes time to fuzz, Sulley walks the graph structure, starting with the root node and fuzzing each component along the way. In this example it begins with the helo request. Once complete, Sulley will begin fuzzing the mail from request. It does so by prefixing each test case with a valid helo request. Next, Sulley moves on to fuzzing the rcpt to request. Again, this is accomplished by prefixing each test case with a valid helo and mail from request. The process continues through data and then restarts down the ehlo path. The ability to break a protocol into individual requests and fuzz all possible paths through the constructed protocol graph is powerful. Consider, for example, an issue disclosed against Ipswitch Collaboration Suite in September 2006.28 The software fault in this case was a stack overflow during the parsing of long strings contained within the characters @ and :. What makes this case interesting is that this vulnerability is only exposed over the EHLO route and not the HELO route. If our fuzzer is unable to walk all possible protocol paths, then issues such as this might be missed.

    When instantiating a session, the following optional keyword arguments can be specified:

  • session_filename (string, default=None). Filename to which to serialize persistent data. Specifying a filename allows you to stop and resume the fuzzer.
  • skip (integer, default=0). Number of test cases to skip.
  • sleep_time (float, default=1.0). Time to sleep in between transmission of test cases.
  • log_level (integer, default=2). Set the log level; a higher number indicates more log messages.
  • proto (string, default="tcp"). Communication protocol.
  • timeout (float, default=5.0). Seconds to wait for a send() or recv() to return prior to timing out.
  • Another advanced feature that Sulley introduces is the ability to register callbacks on every edge defined within the protocol graph structure. This allows us to register a function to call between node transmissions to implement functionality such as challenge response systems. The callback method must follow this prototype:

    def callback(node, edge, last_recv, sock)

    Here, node is the node about to be sent, edge is the last edge along the current fuzz path to node, last_recv contains the data returned from the last socket transmission, and sock is the live socket. A callback is also useful in situations where, for example, the size of the next pack is specified in the first packet. As another example, if you need to fill in the dynamic IP address of the target, register a callback that snags the IP from sock.getpeername()[0]. Edge callbacks can also be registered through the optional keyword argument callback to the session.connect() method.

    Targets and Agents

    The next step is to define targets, link them with agents, and add the targets to the session. In the following example, we instantiate a new target that is running inside a VMWare virtual machine and link it to three agents:

    target = sessions.target("10.0.0.1", 5168) target.netmon = pedrpc.client("10.0.0.1", 26001) target.procmon = pedrpc.client("10.0.0.1", 26002) target.vmcontrol = pedrpc.client("127.0.0.1", 26003) target.procmon_options = { "proc_name" : "SpntSvc.exe", "stop_commands" : ['net stop "trend serverprotect"'], "start_commands" : ['net start "trend serverprotect"'], } sess.add_target(target) sess.fuzz()

    The instantiated target is bound on TCP port 5168 on the host 10.0.0.1. A network monitor agent is running on the target system, listening by default on port 26001. The network monitor will record all socket communications to individual PCAP files labeled by test case number. The process monitor agent is also running on the target system, listening by default on port 26002. This agent accepts additional arguments specifying the process name to attach to, the command to stop the target process, and the command to start the target process. Finally the VMWare control agent is running on the local system, listening by default on port 26003. The target is added to the session and fuzzing begins. Sulley is capable of fuzzing multiple targets, each with a unique set of linked agents. This allows you to save time by splitting the total test space across the various targets.

    Let's take a closer look at each individual agent's functionality.

    Agent: Network Monitor (network_monitor.py)

    The network monitor agent is responsible for monitoring network communications and logging them to PCAP files on disk. The agent is hard-coded to bind to TCP port 26001 and accepts connections from the Sulley session over the PedRPC custom binary protocol. Prior to transmitting a test case to the target, Sulley contacts this agent and requests that it begin recording network traffic. Once the test case has been successfully transmitted, Sulley again contacts this agent, requesting it to flush recorded traffic to a PCAP file on disk. The PCAP files are named by test case number for easy retrieval. This agent does not have to be launched on the same system as the target software. It must, however, have visibility into sent and received network traffic. This agent accepts the following command-line arguments:

    ERR> USAGE: network_monitor.py <-d|—device DEVICE #> device to sniff on (see list below) [-f|—filter PCAP FILTER] BPF filter string [-p|—log_path PATH] log directory to store pcaps to [-l|—log_level LEVEL] log level (default 1), increase for more verbosity Network Device List: [0] \Device\NPF_GenericDialupAdapter [1] {2D938150-427D-445F-93D6-A913B4EA20C0} 192.168.181.1 [2] {9AF9AAEC-C362-4642-9A3F-0768CDA60942} 0.0.0.0 [3] {9ADCDA98-A452-4956-9408-0968ACC1F482} 192.168.81.193 ... Agent: Process Monitor (process_monitor.py)

    The process monitor agent is responsible for detecting faults that might occur in the target process during fuzz testing. The agent is hard-coded to bind to TCP port 26002 and accepts connections from the Sulley session over the PedRPC custom binary protocol. After successfully transmitting each individual test case to the target, Sulley contacts this agent to determine if a fault was triggered. If so, high-level information regarding the nature of the fault is transmitted back to the Sulley session for display through the internal Web server (more on this later). Triggered faults are also logged in a serialized "crash bin" for postmortem analysis. This functionality is explored in further detail later. This agent accepts the following command-line arguments:

    ERR> USAGE: process_monitor.py <-c|—crash_bin FILENAME> filename to serialize crash bin class to [-p|—proc_name NAME] process name to search for and attach to [-i|—ignore_pid PID] ignore this PID when searching for the target process [-l|—log_level LEVEL] log level (default 1), increase for more verbosity Agent: VMWare Control (vmcontrol.py)

    The VMWare control agent is hard-coded to bind to TCP port 26003 and accepts connections from the Sulley session over the PedRPC custom binary protocol. This agent exposes an API for interacting with a virtual machine image, including the ability to start, stop, suspend, or reset the image as well as take, delete, and restore snapshots. In the event that a fault has been detected or the target cannot be reached, Sulley can contact this agent and revert the virtual machine to a known good state. The test sequence honing tool will rely heavily on this agent to accomplish its task of identifying the exact sequence of test cases that trigger any given complex fault. This agent accepts the following command-line arguments:

    ERR> USAGE: vmcontrol.py <-x|—vmx FILENAME> path to VMX to control <-r|—vmrun FILENAME> path to vmrun.exe [-s|—snapshot NAME> set the snapshot name [-l|—log_level LEVEL] log level (default 1), increase for more verbosity Web Monitoring Interface

    The Sulley session class has a built-in minimal Web server that is hard-coded to bind to port 26000. Once the fuzz() method of the session class is called, the Web server thread spins off and the progress of the fuzzer including intermediary results can be seen. An example screen shot is shown in Figure 21.3.

    The fuzzer can be paused and resumed by clicking the appropriate buttons. A synopsis of each detected fault is displayed as a list with the offending test case number listed in the first column. Clicking the test case number loads a detailed crash dump at the time of the fault. This information is of course also available in the crash bin file and accessible programmatically. Once the session is complete, it's time to enter the postmortem phase and analyze the results.

    Postmortem

    Once a Sulley fuzz session is complete, it is time to review the results and enter the postmortem phase. The session's built-in Web server will provide you with early indications on potentially uncovered issues, but this is the time you will actually separate out the results. A couple of utilities exist to help you along in this process. The first is the crashbin_explorer.py utility, which accepts the following command-line arguments:

    $ ./utils/crashbin_explorer.py USAGE: crashbin_explorer.py <xxx.crashbin> [-t|—test #] dump the crash synopsis for a specific test case number [-g|—graph name] generate a graph of all crash paths, save to 'name'.udg

    We can use this utility, for example, to view every location at which a fault was detected and furthermore list the individual test case numbers that triggered a fault at that address. The following results are from a real-world audit against the Trillian Jabber protocol parser:

    $ ./utils/crashbin_explorer.py audits/trillian_jabber.crashbin [3] ntdll.dll:7c910f29 mov ecx,[ecx] from thread 664 caused access violation 1415, 1416, 1417, [2] ntdll.dll:7c910e03 mov [edx],eax from thread 664 caused access violation 3780, 9215, [24] rendezvous.dll:4900c4f1 rep movsd from thread 664 caused access violation 1418, 1419, 1420, 1421, 1422, 1423, 1424, 1425, 3443, 3781, 3782, 3783, 3784, 3785, 3786, 3787, 9216, 9217, 9218, 9219, 9220, 9221, 9222, 9223, [1] ntdll.dll:7c911639 mov cl,[eax+0x5] from thread 664 caused access violation 3442,

    None of these listed fault points might stand out as an obviously exploitable issue. We can drill further down into the specifics of an individual fault by specifying a test case number with the -t command-line switch. Let's take a look at test case number 1416:

    $ ./utils/crashbin_explorer.py audits/trillian_jabber.crashbin -t 1416 ntdll.dll:7c910f29 mov ecx,[ecx] from thread 664 caused access violation when attempting to read from 0x263b7467 CONTEXT DUMP EIP: 7c910f29 mov ecx,[ecx] EAX: 039a0318 ( 60424984) -> gt;&gt;&gt;...&gt;&gt;&gt;&gt;&gt;(heap) EBX: 02f40000 ( 49545216) -> PP@ (heap) ECX: 263b7467 ( 641430631) -> N/A EDX: 263b7467 ( 641430631) -> N/A EDI: 0399fed0 ( 60423888) -> #e<root><message>&gt;&gt;&gt;...&gt;&gt;&amp; (heap) ESI: 039a0310 ( 60424976) -> gt;&gt;&gt;...&gt;&gt;&gt;&gt;&gt;(heap) EBP: 03989c38 ( 60333112) -> \|gt;&t]IP"Ix;IXIox@ @x@PP8|p|Hg9I P (stack) ESP: 03989c2c ( 60333100) -> \|gt;&t]IP"Ix;IXIox@ @x@PP8|p|Hg9I (stack) +00: 02f40000 ( 49545216) -> PP@ (heap) +04: 0399fed0 ( 60423888) -> #e<root><message>&gt;&gt;&gt;...&gt;&&gt;& (heap) +08: 00000000 ( 0) -> N/A +0c: 03989d0c ( 60333324) -> Hg9I Pt]I@"ImI,IIpHsoIPnIX{ (stack) +10: 7c910d5c (2089880924) -> N/A +14: 02f40000 ( 49545216) -> PP@ (heap) disasm around: 0x7c910f18 jnz 0x7c910fb0 0x7c910f1e mov ecx,[esi+0xc] 0x7c910f21 lea eax,[esi+0x8] 0x7c910f24 mov edx,[eax] 0x7c910f26 mov [ebp+0xc],ecx 0x7c910f29 mov ecx,[ecx] 0x7c910f2b cmp ecx,[edx+0x4] 0x7c910f2e mov [ebp+0x14],edx 0x7c910f31 jnz 0x7c911f21 stack unwind: ntdll.dll:7c910d5c rendezvous.dll:49023967 rendezvous.dll:4900c56d kernel32.dll:7c80b50b SEH unwind: 03989d38 -> ntdll.dll:7c90ee18 0398ffdc -> rendezvous.dll:49025d74 ffffffff -> kernel32.dll:7c8399f3

    Again, nothing too obvious might stand out, but we know that we are influencing this specific access violation as the register being invalidly dereferenced, ECX, contains the ASCII string: "&;tg". String expansion issue perhaps? We can view the crash locations graphically, which adds an extra dimension displaying the known execution paths using the -g command-line switch. The following generated graph (Figure 21.4) is again from a real-world audit against the Trillian Jabber parser:

    We can see that although we've uncovered four different crash locations, the source of the issue appears to be the same. Further research reveals that this is indeed correct. The specific flaw exists in the Rendezvous/Extensible Messaging and Presence Protocol (XMPP) messaging subsystem. Trillian locates nearby users through the _presence mDNS (multicast DNS) service on UDP port 5353. Once a user is registered through mDNS, messaging is accomplished via XMPP over TCP port 5298. Within plugins\rendezvous.dll, the following logic is applied to received messages:

    4900C470 str_len: 4900C470 mov cl, [eax] ; *eax = message+1 4900C472 inc eax 4900C473 test cl, cl 4900C475 jnz short str_len 4900C477 sub eax, edx 4900C479 add eax, 128 ; strlen(message+1) + 128 4900C47E push eax 4900C47F call _malloc

    The string length of the supplied message is calculated and a heap buffer in the amount of length + 128 is allocated to store a copy of the message, which is then passed through expatxml.xmlComposeString(), a function called with the following prototype:

    plugin_send(MYGUID, "xmlComposeString", struct xml_string_t *); struct xml_string_t { unsigned int struct_size; char *string_buffer; struct xml_tree_t *xml_tree; };

    The xmlComposeString() routine calls through to expatxml.19002420(), which, among other things, HTML encodes the characters &, >, and < as &, >, and <, respectively. This behavior can be seen in the following disassembly snippet:

    19002492 push 0 19002494 push 0 19002496 push offset str_Amp ; "&amp" 1900249B push offset ampersand ; "&" 190024A0 push eax 190024A1 call sub_190023A0 190024A6 push 0 190024A8 push 0 190024AA push offset str_Lt ; "&lt" 190024AF push offset less_than ; "<" 190024B4 push eax 190024B5 call sub_190023A0 190024BA push 190024BC push 190024BE push offset str_Gt ; "&gt" 190024C3 push offset greater_than ; ">" 190024C8 push eax 190024C9 call sub_190023A0

    As the originally calculated string length does not account for this string expansion, the following subsequent in-line memory copy operation within rendezvous.dll can trigger an exploitable memory corruption:

    4900C4EC mov ecx, eax 4900C4EE shr ecx, 2 4900C4F1 rep movsd 4900C4F3 mov ecx, eax 4900C4F5 and ecx, 3 4900C4F8 rep movsb

    Each of the faults detected by Sulley were in response to this logic error. Tracking fault locations and paths allowed us to quickly postulate that a single source was responsible. A final step we might wish to take is to remove all PCAP files that do not contain information regarding a fault. The pcap_cleaner.py utility was written for exactly this task:

    $ ./utils/pcap_cleaner.py USAGE: pcap_cleaner.py <xxx.crashbin> <path to pcaps>

    This utility will open the specified crash bin file, read in the list of test case numbers that triggered a fault, and erase all other PCAP files from the specified directory. To better understand how everything ties together, from start to finish, we will walk through a complete real-world example audit.

    A Complete Walkthrough

    This example touches on many intermediate to advanced Sulley concepts and should hopefully solidify your understanding of the framework. Many details regarding the specifics of the target are skipped in this walkthrough, as the main purpose of this section is to demonstrate the usage of a number of advanced Sulley features. The chosen target is Trend Micro Server Protect, specifically a Microsoft DCE/RPC endpoint on TCP port 5168 bound to by the service SpntSvc.exe. The RPC endpoint is exposed from TmRpcSrv.dll with the following Interface Definition Language (IDL) stub information:

    // opcode: 0x00, address: 0x65741030 // uuid: 25288888-bd5b-11d1-9d53-0080c83a5c2c // version: 1.0 error_status_t rpc_opnum_0 ( [in] handle_t arg_1, // not sent on wire [in] long trend_req_num, [in][size_is(arg_4)] byte some_string[], [in] long arg_4, [out][size_is(arg_6)] byte arg_5[], // not sent on wire [in] long arg_6 );

    Neither of the parameters arg_1 and arg_6 is actually transmitted across the wire. This is an important fact to consider later when we write the actual fuzz requests. Further examination reveals that the parameter trend_req_num has special meaning. The upper and lower halves of this parameter control a pair of jump tables that expose a plethora of reachable subroutines through this single RPC function. Reverse engineering the jump tables reveals the following combinations:

  • When the value for the upper half is 0x0001, 1 through 21 are valid lower half values.
  • When the value for the upper half is 0x0002, 1 through 18 are valid lower half values.
  • When the value for the upper half is 0x0003, 1 through 84 are valid lower half values.
  • When the value for the upper half is 0x0005, 1 through 24 are valid lower half values.
  • When the value for the upper half is 0x000A, 1 through 48 are valid lower half values.
  • When the value for the upper half is 0x001F, 1 through 24 are valid lower half values.
  • We must next create a custom encoder routine that will be responsible for encapsulating defined blocks as a valid DCE/RPC request. There is only a single function number, so this is simple. We define a basic wrapper around utisl.dcerpc.request(), which hard-codes the opcode parameter to zero:

    # dce rpc request encoder used for trend server protect 5168 RPC service. # opnum is always zero. def rpc_request_encoder (data): return utils.dcerpc.request(0, data) Building the Requests

    Armed with this information and our encoder we can begin to define our Sulley requests. We create a file requests\trend.py to contain all our Trend-related request and helper definitions and begin coding. This is an excellent example of how building a fuzzer request within a language (as opposed to a custom language) is beneficial as we take advantage of some Python looping to automatically generate a separate request for each valid upper value from trend_req_num:

    for op, submax in [(0x1, 22), (0x2, 19), (0x3, 85), (0x5, 25), (0xa, 49), (0x1f, 25)]: s_initialize("5168: op-%x" % op) if s_block_start("everything", encoder=rpc_request_encoder): # [in] long trend_req_num, s_group("subs", values=map(chr, range(1, submax))) s_static("\x00") # subs is actually a little endian word s_static(struct.pack("<H", op)) # opcode # [in][size_is(arg_4)] byte some_string[], s_size("some_string") if s_block_start("some_string", group="subs"): s_static("A" * 0x5000, name="arg3") s_block_end() # [in] long arg_4, s_size("some_string") # [in] long arg_6 s_static(struct.pack("<L", 0x5000)) # output buffer size s_block_end()

    Within each generated request a new block is initialized and passed to our previously defined custom encoder. Next, the s_group() primitive is used to define a sequence named subs that represents the lower half value of trend_req_num we saw earlier. The upper half word value is next added to the request stream as a static value. We will not be fuzzing the trend_req_num as we have reverse engineered its valid values; had we not, we could enable fuzzing for these fields as well. Next, the NDR size prefix for some_string is added to the request. We could optionally use the Sulley DCE/RPC NDR lego primitives here, but because the RPC request is so simple we decide to represent the NDR format manually. Next, the some_string value is added to the request. The string value is encapsulated in a block so that its length can be measured. In this case we use a static-sized string of the character A (roughly 20k worth). Normally we would insert an s_string() primitive here, but because we know Trend will crash with any long string, we reduce the test set by utilizing a static value. The length of the string is appended to the request again to fulfill the size_is requirement for arg_4. Finally, we specify an arbitrary static size for the output buffer size and close the block. Our requests are now ready and we can move on to creating a session.

    Creating the Session

    We create a new file in the top-level Sulley folder named fuzz_trend_server_protect_5168.py for our session. This file has since been moved to the archived_fuzzies folder because it has completed its life. First things first, we import Sulley and the created Trend requests from the request library:

    from sulley import * from requests import trend

    Next, we are going to define a presend function that is responsible for establishing the DCE/RPC connection prior to the transmission of any individual test case. The presend routine accepts a single parameter, the socket on which to transmit data. This is a simple routine to write thanks to the availability of utils.dcerpc.bind(), a Sulley utility routine:

    def rpc_bind (sock): bind = utils.dcerpc.bind("25288888-bd5b-11d1-9d53-0080c83a5c2c", "1.0") sock.send(bind) utils.dcerpc.bind_ack(sock.recv(1000))

    Now it's time to initiate the session and define a target. We'll fuzz a single target, an installation of Trend Server Protect housed inside a VMWare virtual machine with the address 10.0.0.1. We'll follow the framework guidelines by saving the serialized session information to the audits directory. Finally, we register a network monitor, process monitor, and virtual machine control agent with the defined target:

    sess = sessions.session(session_filename="audits/trend_server_protect_5168.session") target = sessions.target("10.0.0.1", 5168) target.netmon = pedrpc.client("10.0.0.1", 26001) target.procmon = pedrpc.client("10.0.0.1", 26002) target.vmcontrol = pedrpc.client("127.0.0.1", 26003)

    Because a VMWare control agent is present, Sulley will default to reverting to a known good snapshot whenever a fault is detected or the target is unable to be reached. If a VMWare control agent is not available but a process monitor agent is, then Sulley attempts to restart the target process to resume fuzzing. This is accomplished by specifying the stop_commands and start_commands options to the process monitor agent:

    target.procmon_options = { "proc_name" : "SpntSvc.exe", "stop_commands" : ['net stop "trend serverprotect"'], "start_commands" : ['net start "trend serverprotect"'], }

    The proc_name parameter is mandatory whenever you use the process monitor agent; it specifies what process name to which the debugger should attach and in which to look for faults. If neither a VMWare control agent nor a process monitor agent is available, then Sulley has no choice but to simply provide the target time to recover in the event a data transmission is unsuccessful.

    Next, we instruct the target to start by calling the VMWare control agents restart_target() routine. Once running, the target is added to the session, the presend routine is defined, and each of the defined requests is connected to the root fuzzing node. Finally, fuzzing commences with a call to the session classes' fuzz() routine.

    # start up the target. target.vmcontrol.restart_target() print "virtual machine up and running" sess.add_target(target) sess.pre_send = rpc_bind sess.connect(s_get("5168: op-1")) sess.connect(s_get("5168: op-2")) sess.connect(s_get("5168: op-3")) sess.connect(s_get("5168: op-5")) sess.connect(s_get("5168: op-a")) sess.connect(s_get("5168: op-1f")) sess.fuzz() Setting Up the Environment

    The final step before launching the fuzz session is to set up the environment. We do so by bringing up the target virtual machine image and launching the network and process monitor agents directly within the test image with the following command-line parameters:

    network_monitor.py -d 1 -f "src or dst port 5168" -p audits\trend_server_protect_5168 process_monitor.py -c audits\trend_server_protect_5168.crashbin -p SpntSvc.exe

    Both agents are executed from a mapped share that corresponds with the Sulley top-level directory from which the session script is running. A Berkeley Packet Filter (BPF) filter string is passed to the network monitor to ensure that only the packets we are interested in are recorded. A directory within the audits folder is also chosen where the network monitor will create PCAPs for every test case. With both agents and the target process running, a live snapshot is made as named sulley ready and waiting.

    Next, we shut down VMWare and launch the VMWare control agent on the host system (the fuzzing system). This agent requires the path to the vmrun.exe executable, the path to the actual image to control, and finally the name of the snapshot to revert to in the event of a fault discovery of data transmission failure:

    vmcontrol.py -r "c:\\VMware\vmrun.exe" -x "v:\vmfarm\Trend\win_2000_pro.vmx" —snapshot "sulley ready and waiting" Ready, Set, Action! And Postmortem

    Finally, we are ready. Simply launch fuzz_trend_server_protect_5168.py, connect a Web browser to http://127.0.0.1:26000 to monitor the fuzzer progress, sit back, watch, and enjoy.

    When the fuzzer completes running through its list of 221 test cases, we discover that 19 of them triggered faults. Using the crashbin_explorer.py utility we can explore the faults categorized by exception address:

    $ ./utils/crashbin_explorer.py audits/trend_server_protect_5168.crashbin [6] [INVALID]:41414141 Unable to disassemble at 41414141 from thread 568 caused access violation 42, 109, 156, 164, 170, 198, [3] LogMaster.dll:63272106 push ebx from thread 568 caused access violation 53, 56, 151, [1] ntdll.dll:77fbb267 push dword [ebp+0xc] from thread 568 caused access violation 195, [1] Eng50.dll:6118954e rep movsd from thread 568 caused access violation 181, [1] ntdll.dll:77facbbd push edi from thread 568 caused access violation 118, [1] Eng50.dll:61187671 cmp word [eax],0x3b from thread 568 caused access violation 116, [1] [INVALID]:0058002e Unable to disassemble at 0058002e from thread 568 caused access violation 70, [2] Eng50.dll:611896d1 rep movsd from thread 568 caused access violation 152, 182, [1] StRpcSrv.dll:6567603c push esi from thread 568 caused access violation 106, [1] KERNEL32.dll:7c57993a cmp ax,[edi] from thread 568 caused access violation 165, [1] Eng50.dll:61182415 mov edx,[edi+0x20c] from thread 568 caused access violation 50,

    Some of these are clearly exploitable issues, for example, the test cases that resulted with an EIP of 0x41414141. Test case 70 seems to have stumbled on a possible code execution issue as well, a Unicode overflow (actually this can be a straight overflow with a bit more research). The crash bin explorer utility can generate a graph view of the detected faults as well, drawing paths based on observed stack backtraces. This can help pinpoint the root cause of certain issues. The utility accepts the following command-line arguments:

    $ ./utils/crashbin_explorer.py USAGE: crashbin_explorer.py <xxx.crashbin> [-t|—test #] dump the crash synopsis for a specific test case number [-g|—graph name] generate a graph of all crash paths, save to 'name'.udg

    We can, for example, further examine the CPU state at the time of the fault detected in response to test case 70:

    $ ./utils/crashbin_explorer.py audits/trend_server_protect_5168.crashbin -t 70 [INVALID]:0058002e Unable to disassemble at 0058002e from thread 568 caused access violation when attempting to read from 0x0058002e CONTEXT DUMP EIP: 0058002e Unable to disassemble at 0058002e EAX: 00000001 ( 1) -> N/A EBX: 0259e118 ( 39444760) -> A..... AAAAA (stack) ECX: 00000000 ( 0) -> N/A EDX: ffffffff (4294967295) -> N/A EDI: 00000000 ( 0) -> N/A ESI: 0259e33e ( 39445310) -> A..... AAAAA (stack) EBP: 00000000 ( 0) -> N/A ESP: 0259d594 ( 39441812) -> LA.XLT.......MPT.MSG.OFT.PPS.RT (stack) +00: 0041004c ( 4259916) -> N/A +04: 0058002e ( 5767214) -> N/A +08: 0054004c ( 5505100) -> N/A +0c: 0056002e ( 5636142) -> N/A +10: 00530042 ( 5439554) -> N/A +14: 004a002e ( 4849710) -> N/A disasm around: 0x0058002e Unable to disassemble SEH unwind: 0259fc58 -> StRpcSrv.dll:656784e3 0259fd70 -> TmRpcSrv.dll:65741820 0259fda8 -> TmRpcSrv.dll:65741820 0259ffdc -> RPCRT4.dll:77d87000 ffffffff -> KERNEL32.dll:7c5c216c

    You can see here that the stack has been blown away by what appears to be a Unicode string of file extensions. You can pull up the archived PCAP file for the given test case as well. Figure 21.5 shows an excerpt of a screen shot from Wireshark examining the contents of one of the captured PCAP files.

    A final step we might wish to take is to remove all PCAP files that do not contain information regarding a fault. The pcap_cleaner.py utility was written for exactly this task:

    $ ./utils/pcap_cleaner.py USAGE: pcap_cleaner.py <xxx.crashbin> <path to pcaps>

    This utility will open the specified crash bin file, read in the list of test case numbers that triggered a fault, and erase all other PCAP files from the specified directory. The discovered code execution vulnerabilities in this fuzz were all reported to Trend and have resulted in the following advisories:

  • TSRT-07-01: Trend Micro ServerProtect StCommon.dll Stack Overflow Vulnerabilities
  • TSRT-07-02: Trend Micro ServerProtect eng50.dll Stack Overflow Vulnerabilities
  • This is not to say that all possible vulnerabilities have been exhausted in this interface. In fact, this was the most rudimentary fuzzing possible of this interface. A secondary fuzz that actually uses the s_string() primitive as opposed to simply a long string can now be beneficial.


    Greening Cloud-Enabled Big Data Storage Forensics: Syncany as a Case Study | killexams.com real questions and Pass4sure dumps

    11

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    TARP: Ticket-based address resolution protocol | killexams.com real questions and Pass4sure dumps

    SSH provides secure login, file transfer, X11, and TCP/IP connections over an untrusted network. It uses cryptographic authentication, automatic session encryption, and integrity protection for transferred data. RSA is used for key exchange and authentication, and symmetric algorithms (e.g., IDEA or threekey triple-DES) for encrypting transferred data. SSH is intended as a replacement for the existing rsh, rlogin, rcp, rdist, and telnet protocols. SSH is currently (March 1996) being used at thousands of sites in at least 50 countries. Its users include top universities, research laboratories, many major corporations, and numerous smaller companies and individuals. The SSH protocol can also be used as a generic transport layer encryption mechanism, providing both host authentication and user authentication, together with privacy and integrity protection. 1 Introduction The Internet has become the most economical means for communication between two remote sites. Its uses include comm...



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