[UNIX] osCommerce Malformed Session ID XSS

From: SecuriTeam (support_at_securiteam.com)
Date: 12/22/03

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Date: 22 Dec 2003 13:13:20 +0200

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      osCommerce Malformed Session ID XSS
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.oscommerce.com> osCommerce is "an online shop e-commerce
    solution under on going development by the open source community. Its
    feature packed out-of-the-box installation allows store owners to setup,
    run, and maintain their online stores with minimum effort and with
    absolutely no costs or license fees involved".

    A cross-site scripting vulnerability in the product allows remote
    attackers to inject arbitrary HTML and/or JavaScript into the content
    returned by the web site using the product.

    DETAILS

    Vulnerable systems:
     * osCommerce version 2.2 Milestone 2 and prior

    Immune systems:
     * osCommerce version 2.2 Milestone 3

    Problem:
    osCommerce is vulnerable to a XSS flaw. The flaw can be exploited when a
    malicious user passes a malformed session ID to URI. The following is an
    example of the flaw: https://path/?osCsid="><iframe
    src=http://www.gulftech.org></iframe>.

    Solution:
    This is the response from the developer. To fix the issue, the $_sid
    parameter needs to be wrapped around tep_output_string() in the
    tep_href_link() function defined in includes/functions/html_output.php.

    Before:
    if (isset($_sid)) {
    $link .= $separator . $_sid;
    }

    After:
    if (isset($_sid)) {
    $link .= $separator . tep_output_string($_sid);
    }

    osCommerce 2.2 Milestone 3 will redirect the user to the index page when a
    malformed session ID is used, so that a new session ID can be generated.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:security@gulftech.org>
    JeiAr.

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