339 lines
14 KiB
Plaintext
339 lines
14 KiB
Plaintext
Using the Opcode Database CLI (msfopcode)
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The 3.0 version of the Metasploit Framework comes with a command line
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interface to the Metasploit Opcode Database. This can be used instead
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of the web-based wizard to easily search for portable opcode
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addresses. The interface is provided through the msfopcode command
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which is found in the root directory of the installation. This
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interface is merely a front-end to a the
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Rex::Exploitation::OpcodeDb::Client class interface that interfaces
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with a HTTP-based XML protocol running on the Metasploit.com
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web-server.
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The interface itself provides a simplified interface to some of the
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different aspects of the opcode database. When running the command
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with no arguments, the following output is shown:
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$ ./msfopcode
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Usage: msfopcode command
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SUPPORTED COMMANDS
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stats Display database statistics
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locales Display supported locales
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metatypes Display supported opcode meta types (Ex: jmp reg)
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groups Display supported opcode groups (Ex: esp => eip)
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types Display supported opcode types (Ex: jmp esp)
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platforms Display supported platforms
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modules Display information about specific modules
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search Search for opcodes given a set of criteria
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The purpose of the stats command is to show the current database
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statistics, such as the number of opcodes and modules currently
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indexed by the database and the last time the database was updated.
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The output to this command looks something like this:
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$ ./msfopcode stats
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Last Updated : Sat Sep 03 01:32:00 CDT 2005
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Number of Opcodes : 12177419
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Number of Opcode Types : 320
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Number of Platforms : 14
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Number of Architectures : 1
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Number of Modules : 17683
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Number of Module Segments: 71457
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Number of Module Imports : 2065492
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Number of Module Exports : 927637
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The locales command lists the locales that are currently supported by
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the database. In the future, more locales will be indexed to provided
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a more complete view of opcode portability.
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$ ./msfopcode locales
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English
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French
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The metatypes command lists the opcode meta types currently supported
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by the database. An opcode meta type is defined as a general
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categorization of opcodes based on the action they perform, such as
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jumping to a register, performing a pop/pop/ret, and so on. The meta
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type helps categorize different specific types of opcodes.
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$ ./msfopcode metatypes
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pop/pop/ret
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jmp reg
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call reg
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jmp [reg + offset]
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call [reg + offset]
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popad/ret
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popaw/ret
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push reg/ret
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The groups command lists the opcode groups currently supported by the
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database. The distinction between and opcode group and an opcode meta
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type is that an opcode group associates opcodes based on the specific
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action they perform, such as transitioning the instruction pointer to
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the current value of a specific register, like esp.
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$ ./msfopcode groups
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eax => eip
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ebx => eip
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ecx => eip
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edx => eip
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edi => eip
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esi => eip
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ebp => eip
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esp => eip
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[esp + 8] => eip
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[reg + offset] => eip
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[esp + 0x10] => eip
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[esp + 0x20] => eip
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[reg] => eip
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The types command lists all of the various specific opcode types
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supported by the database. An opcode type is an instance of a specific
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opcode or opcodes that form one logical instruction block, such as a
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jmp esp. Opcode types are grouped together through the use of opcode
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groups and meta types. A sampling of the output is shown below:
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$ ./msfopcode types
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jmp esp
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call esp
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push esp, ret
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jmp ebp
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call ebp
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push ebp, ret
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jmp eax
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...
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The platforms command lists the currently supported operating system
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versions broken down by major version and service pack. At this point,
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the database supports Windows NT SP3 through Windows 2003 Server SP1.
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The database does not take into account hot fixes. Optionally,
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platforms can be filtered by specifying the -p option with an argument
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that includes a text portion of the operating system name or version
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to filter. For instance, specifying -p 2000 will return only Windows
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2000 versions.
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$ ./msfopcode platforms
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Windows NT 4.0.3.0 SP3 (IA32)
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Windows NT 4.0.4.0 SP4 (IA32)
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Windows NT 4.0.5.0 SP5 (IA32)
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Windows NT 4.0.6.0 SP6 (IA32)
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Windows 2000 5.0.0.0 SP0 (IA32)
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Windows 2000 5.0.1.0 SP1 (IA32)
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Windows 2000 5.0.2.0 SP2 (IA32)
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Windows 2000 5.0.3.0 SP3 (IA32)
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Windows 2000 5.0.4.0 SP4 (IA32)
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Windows XP 5.1.0.0 SP0 (IA32)
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Windows XP 5.1.1.0 SP1 (IA32)
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Windows XP 5.1.2.0 SP2 (IA32)
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Windows 2003 Server 5.2.0.0 SP0 (IA32)
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Windows 2003 Server 5.2.1.0 SP1 (IA32)
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One of the major features of the opcode database is that it indexes
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detailed information about modules. For instance, the opcode database
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currently contains information about imports, exports, segments, and
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specific module attributes for every imported module in the database.
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This makes it possible to cross reference different modules and do all
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sorts of fun things. To extract information about modules, the modules
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command can be used. The usage for this command is shown below:
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$ ./msfopcode modules -h
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Usage: msfopcode modules
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OPTIONS:
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-E Include module export information
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-I Include module import information
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-S Include module segment information
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-d Display detailed output
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-h Help banner
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-l A comma separated list of locales to filter (Ex: English)
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-m A comma separated list of module names to filter (Ex: kernel32.dll,use
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r32.dll)
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-p A comma separated list of operating system names to filter (Ex: 2000,X
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P)
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-x Dump the raw XML response
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The explanation in the usage for each option is fairly self
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explanatory, but the basic idea is that it's possible to search the
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database for modules with the ability to filter based on file name,
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locale, and operating system version. For the results that are
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returned, information about the module imports, exports, segments, and
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detailed information can be displayed. For example, to see all of the
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versions of kernel32.dll currently indexed in the database, the
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following command would be run:
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$ ./msfopcode modules -m kernel32.dll
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Matching Modules
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================
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Name Base Address Size Version Timestamp
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Locale
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---- ------------ ---- ------- ---------
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------
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kernel32.dll 0x77e70000 790528 5.0.2191.1 Tue Dec 14 17:20:09 CST 1999 French
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kernel32.dll 0x77e40000 1056768 5.2.3790.1830031 Thu Mar 24 20:30:42 CST 2005 English
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kernel32.dll 0x77e40000 999424 5.2.3790.3 Tue Mar 25 03:42:44 CST 2003 English
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kernel32.dll 0x77f00000 385024 4.0.0.0 Fri Apr 25 15:33:31 CDT 1997 English
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kernel32.dll 0x77ef0000 421888 4.0.0.0 Mon Mar 29 18:10:58 CST 1999 English
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kernel32.dll 0x77f00000 385024 4.0.0.0 Sun Feb 28 17:49:07 CST 1999 English
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kernel32.dll 0x77f00000 385024 4.0.0.0 Tue Jul 20 18:19:59 CDT 1999 English
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kernel32.dll 0x77e80000 745472 5.0.2191.1 Wed Dec 01 01:37:24 CST 1999 English
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kernel32.dll 0x77e80000 741376 5.0.2195.1600 Fri Jun 09 21:03:14 CDT 2000 English
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kernel32.dll 0x77e80000 741376 5.0.2195.2778 Fri May 04 17:34:08 CDT 2001 English
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kernel32.dll 0x77e80000 745472 5.0.2195.5400 Tue Jul 23 03:13:13 CDT 2002 English
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kernel32.dll 0x7c4e0000 757760 5.0.2195.6688 Thu Jun 19 22:43:40 CDT 2003 English
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kernel32.dll 0x77e60000 937984 5.1.2600.0 Sat Aug 18 01:33:02 CDT 2001 English
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kernel32.dll 0x77e60000 942080 5.1.2600.11061 Thu Aug 29 06:40:40 CDT 2002 English
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kernel32.dll 0x7c800000 999424 5.1.2600.21802 Wed Aug 04 03:56:36 CDT 2004 English
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If only the versions of kernel32.dll on Windows XP running on the
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English locale were of concern, the results could be limited by
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specifying more limiting parameters:
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$ ./msfopcode modules -m kernel32.dll -p XP -l English
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Matching Modules
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================
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Name Base Address Size Version Timestamp
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Locale
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---- ------------ ---- ------- ---------
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------
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kernel32.dll 0x77e60000 937984 5.1.2600.0 Sat Aug 18 01:33:02 CDT 2001 English
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kernel32.dll 0x77e60000 942080 5.1.2600.11061 Thu Aug 29 06:40:40 CDT 2002 English
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kernel32.dll 0x7c800000 999424 5.1.2600.21802 Wed Aug 04 03:56:36 CDT 2004 English
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To display detailed information about modules that match, the -d
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parameter can be specified:
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$ ./msfopcode modules -m kernel32.dll -p XP -l English -d
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.-============================================
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Name : kernel32.dll
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Base Address: 0x77e60000
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Size : 937984
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Version : 5.1.2600.0
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Timestamp : Sat Aug 18 01:33:02 CDT 2001
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Locale : English
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Platforms :
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Windows XP 5.1.0.0 SP0 (IA32)
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.-============================================
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Name : kernel32.dll
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Base Address: 0x77e60000
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Size : 942080
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Version : 5.1.2600.11061
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Timestamp : Thu Aug 29 06:40:40 CDT 2002
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Locale : English
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Platforms :
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Windows XP 5.1.1.0 SP1 (IA32)
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.-============================================
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Name : kernel32.dll
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Base Address: 0x7c800000
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Size : 999424
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Version : 5.1.2600.21802
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Timestamp : Wed Aug 04 03:56:36 CDT 2004
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Locale : English
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Platforms :
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Windows XP 5.1.2.0 SP2 (IA32)
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The real purpose behind the opcode database, however, is the ability
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to search for specific opcodes across different operating system
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versions with the ability to cross reference results in order to
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determine return address portability. For that reason, the msfopcode
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script provides the search command:
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$ ./msfopcode search -h
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Usage: msfopcode search
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OPTIONS:
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-M A comma separated list of opcode meta types to filter (Ex: jmp reg)
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-P Results must span more than one operating system version
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-a A comma separated list of addresses to filter (Ex: 0x41424344)
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-g A comma separated list of opcode groups to filter (Ex: esp => eip)
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-h Help banner
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-l A comma separated list of locales to filter (Ex: English)
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-m A comma separated list of module names to filter (Ex: kernel32.dll,user32.dll)
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-p A comma separated list of operating system names to filter (Ex: 2000,XP)
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-t A semi-colon separated list of opcode types to filter (Ex: jmp esp,call esp)
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-x Dump the raw XML response
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Like the modules command, the search command provides a way of
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limiting the results that come back as a result of the search. In this
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case, opcode results can be limited based on meta type, group, type,
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operating system, module, locale, and even address. This makes it
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possible to get fairly granular results in an intuitive manner.
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Furthermore, the server can be instructed to only return results that
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are portable in the event that the -P option is specified, although
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there are currently some issues with this option being accurate.
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To search for all occurrences of a ecx => eip opcode group in
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ws2help.dll on Windows 2000 and XP, the following command could be
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issued:
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$ ./msfopcode search -p 2000,XP -m ws2help.dll -g "ecx => eip"
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Opcodes
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=======
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Address Type OS
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------- ---- --
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0x74fa3112 call ecx Windows 2000 5.0.0.0 SP0 (IA32) (ws2help.dll)
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Windows 2000 5.0.1.0 SP1 (IA32) (ws2help.dll)
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Windows 2000 5.0.2.0 SP2 (IA32) (ws2help.dll)
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Windows 2000 5.0.4.0 SP4 (IA32) (ws2help.dll)
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0x71aa1224 push ecx, ret Windows XP 5.1.0.0 SP0 (IA32) (ws2help.dll)
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Windows XP 5.1.1.0 SP1 (IA32) (ws2help.dll)
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0x71aa396d call ecx Windows XP 5.1.0.0 SP0 (IA32) (ws2help.dll)
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Windows XP 5.1.1.0 SP1 (IA32) (ws2help.dll)
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0x71aa3de3 call ecx Windows XP 5.1.2.0 SP2 (IA32) (ws2help.dll)
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0x71aa163b push ecx, ret Windows XP 5.1.2.0 SP2 (IA32) (ws2help.dll)
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0x75023112 call ecx Windows 2000 5.0.0.0 SP0 (IA32) (ws2help.dll)
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Windows 2000 5.0.1.0 SP1 (IA32) (ws2help.dll)
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Windows 2000 5.0.2.0 SP2 (IA32) (ws2help.dll)
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Windows 2000 5.0.3.0 SP3 (IA32) (ws2help.dll)
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Windows 2000 5.0.4.0 SP4 (IA32) (ws2help.dll)
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To limit the results to portable ones only, the -P option can be
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tagged on producing output like that shown below:
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$ ./msfopcode search -p 2000,XP -m ws2help.dll -g "ecx => eip" -P
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Opcodes
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=======
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Address Type OS
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------- ---- --
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0x74fa3112 call ecx Windows 2000 5.0.0.0 SP0 (IA32) (ws2help.dll)
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Windows 2000 5.0.1.0 SP1 (IA32) (ws2help.dll)
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Windows 2000 5.0.2.0 SP2 (IA32) (ws2help.dll)
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Windows 2000 5.0.4.0 SP4 (IA32) (ws2help.dll)
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0x71aa1224 push ecx, ret Windows XP 5.1.0.0 SP0 (IA32) (ws2help.dll)
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Windows XP 5.1.1.0 SP1 (IA32) (ws2help.dll)
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0x71aa396d call ecx Windows XP 5.1.0.0 SP0 (IA32) (ws2help.dll)
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Windows XP 5.1.1.0 SP1 (IA32) (ws2help.dll)
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0x75023112 call ecx Windows 2000 5.0.0.0 SP0 (IA32) (ws2help.dll)
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Windows 2000 5.0.1.0 SP1 (IA32) (ws2help.dll)
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Windows 2000 5.0.2.0 SP2 (IA32) (ws2help.dll)
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Windows 2000 5.0.3.0 SP3 (IA32) (ws2help.dll)
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Windows 2000 5.0.4.0 SP4 (IA32) (ws2help.dll)
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For custom development purposes, the script can also be told to dump
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results in raw XML format such that extensions can be written to the
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interface in the future by third parties. This can be accomplished by
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specifying the -x parameter.
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More information online at: http://metasploit.com/framework/
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