[UNIX] vBulletin SQL Injection While Verifying Subscription Information

From: SecuriTeam (support_at_securiteam.com)
Date: 09/14/04

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    To: list@securiteam.com
Date: 14 Sep 2004 14:06:38 +0200

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      vBulletin SQL Injection While Verifying Subscription Information
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.vbulletin.com/> vBulletin is a powerful, scalable and fully
    customizable forums package for your web site. It has been written using
    the Web's quickest-growing scripting language; PHP, and is complimented
    with a highly efficient and ultra fast back-end database engine built
    using MySQL."

    vBulletin is prone to an SQL injection vulnerability due to improper use
    of POST variables when attempting to verify a user's subscription.

    DETAILS

    Vulnerable Systems:
     * vBulletin version 3.0 up to and including version 3.0.3

    In a typical SQL injection scenario, variables from HTTP requests such as
    GET and POST are directly passed to an SQL query, allowing the malicious
    attacker to insert additional SQL commands, thereby concatenating
    additional commands to the original. A code snippet from vBulletin's code
    clearly shows the problem:
    error_reporting(E_ALL & ~E_NOTICE);
     
    define('NO_REGISTER_GLOBALS', 1);
    define('SESSION_BYPASS', 1);
     
    $phrasegroups = array();
    $specialtemplates = array();
     
    chdir('./../');
    require('./includes/init.php');
    require('./includes/functions.php');
    require('./includes/adminfunctions.php');
    require('./includes/functions_subscriptions.php');
     
    $check_hash = strtoupper(md5($vboptions['authorize_loginid'] .
    $_POST['x_trans_id'] . $_POST['x_amount']));
     
    if ($check_hash == $_POST['x_MD5_Hash'] AND $_POST['x_response_code'] ==
    1)
    {
     $item_number = explode('_', $_POST['x_invoice_num']);
     $subscriptionid = intval($item_number[0]);
     
     if (empty($item_number[1]) OR empty($item_number[2]))
     { // non vBulletin subscription
      exit;
     }
     
     $userid = $DB_site->query_first("SELECT userid, languageid, styleid FROM
    " . TABLE_PREFIX . "user WHERE userid = " . $item_number[1]);

    It is easily seen that the $item_number[1] variable is take from the POST
    request and passed directly into the SQL query, thus facilitating SQL
    injection.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:al3ndaleeb@uk2.net>
    al3ndaleeb.

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