[UNIX] phpCMS Cross Site Scripting and Information Disclosure Issues

From: SecuriTeam (support_at_securiteam.com)
Date: 11/29/04

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Date: 29 Nov 2004 10:56:41 +0200

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      phpCMS Cross Site Scripting and Information Disclosure Issues
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.phpcms.de/> phpCMS is a content management system, which
    convinces in particular by small system requirements, high performance and
    above all its flexibility. phpCMS is suitable for small private web pages
    and also for complex professional appearances and high traffic websites
    including the integration of webservices and external applications."

    An input validation error in the system's code paves the way for an XSS
    vulnerability which is exploitable through at least one argument.

    DETAILS

    Vulnerable Systems:
     * phpCMS version 1.2.1 and prior

    Immune Systems:
     * phpCMS version 1.2.1.pl1

    An implementation error in the validation of the user input may lead to an
    XSS vulnerability allowing the malicious user to conduct cross site
    scripting attacks. In addition, the specifics of the problem allow the
    malicious attacker to gain information about the server's configuration
    when phpCMS is configured in non-stealth mode with debug mode enabled.

    Example:
    http://[somehost]/parser/parser.php?file=<scr!pt>alert(document.cookie)</scr!pt>

    The error page displays the input supplied by the user, without filtering,
    and in addition the full path to the phpCMS root directory.

    Proof of concept:
    http://[somehost]/parser/parser.php?file=donotexist
    ->
    phpCMS 1.2.1
    Error: 07: could not find file for parsing.
    /var/www/localhost/htdocsdonotexists/index.htm

    Vendor Status:
    The vendor has already supplied a fixed version of the system. Users are
    encouraged to upgrade to the newer 1.2.1.pl1 version. In any case it would
    be best not to run the system in non-stealth mode combined with debug mode
    with untrusted access.

    Disclosure Timeline:
    2004/11/24 - Vulnerability discovered
    2004/11/24 - Vendor notified
    2004/11/25 - Vendor response
    2004/11/25 - Fix released

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:cb-lse@ifrance.com> Cyrille
    Barthelemy.

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