[UNIX] Multiple Extensions Vulnerability in MediaWiki

From: SecuriTeam (support_at_securiteam.com)
Date: 12/28/04

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Date: 28 Dec 2004 16:42:25 +0200

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      Multiple Extensions Vulnerability in MediaWiki
    ------------------------------------------------------------------------

    SUMMARY

     <http://wikipedia.sourceforge.net/> MediaWiki is one of famous wiki web
    applications. However, an input validation flaw in MediaWiki can cause
    malicious attackers to run arbitrary commands with the privilege of the
    HTTPD process, which is typically run as the nobody user.

    DETAILS

    Vulnerable Systems:
     * MediaWiki 1.3.8 and prior

    Immune Systems:
     * MediaWiki 1.3.9 or newer

    MediaWiki did not implement any type of check for multiple extensions of
    uploaded files, e.g. attack.php.rar. Therefore, a malicious attackers can
    upload arbitrary script files (PHP, pl, CGI, etc) to a web server and then
    execute them.

    The vulnerability originates from the feature of Apache's MIME module
    (mod_mime), which regards attack.php.rar as a normal PHP file and executes
    the file through mod_php module with the privilege of the HTTPD process.

    Disclosure Timeline:
    2004-12-10 Vulnerability found.
    2004-12-10 MediaWiki developer notified
    2004-12-13 Update version released
    2004-12-15 Official release

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:advisory@stgsecurity.com>
    SSR Team.

    ========================================

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