[UNIX] XOOPS myheader.php Cross Site Scripting Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 12/24/03

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Date: 24 Dec 2003 15:04:12 +0200

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      XOOPS myheader.php Cross Site Scripting Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.xoops.org/modules/news/> XOOPS is "a dynamic OO (Object
    Oriented) based open source portal script written in PHP. XOOPS supports a
    number of databases, making XOOPS an ideal tool for developing small to
    large dynamic community websites, intra company portals, corporate
    portals, weblogs and much more". The weblinks module contains a file named
    "myheader.php" in /modules/mylinks/ directory, this module contains a
    cross-site scripting vulnerability.

    DETAILS

    Vulnerable systems:
     * XOOPS version 2.0.5.1

    Vulnerable code:
    The code of the file is as follow:
    include "../../mainfile.php";
    $url = $HTTP_GET_VARS['url'];
    $lid = intval($HTTP_GET_VARS['lid']);
     .
     .
     .
    < td class='bg4' align="center"><small>
    < a target="main" href="ratelink.php?cid=<? echo $cid; ?>&lid=<? echo
    $lid; ?>"><? echo _MD_RATETHISSITE; ?></a> | < a target="main"
    href="modlink.php?lid=<? echo $lid; ?>"><? echo _MD_MODIFY; ?></a> | < a
    target="main" href="brokenlink.php?lid=<? echo $lid; ?>"><? echo
    _MD_REPORTBROKEN; ?></a> | < a target='_top' href='mailto:?subject=<? echo
    $mail_subject; ?>&body=<? echo $mail_body;?>'><? echo _MD_TELLAFRIEND;
    ?></a> | < a target='_top' href="<? echo XOOPS_URL; ?>">Back to <? echo
    $xoopsConfig['sitename']; ?></a> | < a target='_top' href="<? echo $url;
    ?>">Close Frame</a>
    </small>
     .
     .

    The value for variable "url" is used in line < a target='_top' href="<?
    echo $url; ?>">Close Frame</a> without being sanitized. Thus, an attacker
    can pass a JavaScript code as a value for variable 'url' and get it
    executed as soon as the victim clicks the "Close Frame" link.

    Exploit:
    By clicking on the link:
    http://[target]/modules/mylinks/myheader.php?url=javascript:alert(document.cookie);, the victim gets directed to a page containing a link "Close Frame" which is actually the JavaScript code inserted by the attacker. A cookie captured can be used by an attacker to login with the hijacked user's (including admin) privileges.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:chesschintan@hotmail.com>
    Chintan Trivedi.

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