[UNIX] Multiple Extensions Vulnerability in phpBB Attachment Mod

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

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    To: list@securiteam.com
Date: 28 Dec 2004 16:45:44 +0200

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      Multiple Extensions Vulnerability in phpBB Attachment Mod
    ------------------------------------------------------------------------

    SUMMARY

    The <http://www.opentools.de/> phpBB Attachment Mod is a "file upload
    module for phpBB". However, an input validation flaw in phpBB's Attachment
    Mod allows a malicious attackers to run arbitrary commands with the
    privileges of the HTTPD process, which is typically run as the nobody
    user.

    DETAILS

    Vulnerable Systems:
     * phpBB's Attachment Mod version 2.3.10 and prior

    Immune Systems:
     * phpBB's Attachment Mod version 2.3.11 or newer

    phpBB's Attachment Mod doesn't implemented any type of check for multiple
    extensions of uploaded files, e.g. attack.php.rar. Therefore, malicious
    attackers can upload arbitrary script files (PHP, pl, CGI, etc) to a web
    server. This is vulnerability is caused by Apache's MIME module
    (mod_mime), which regards attack.php.rar as a normal PHP file and execute
    the file through mod_php module with the privilege of the HTTPD process.

    Disclosure Timeline:
    2004-12-08 Vulnerability found
    2004-12-08 Attachment Mod 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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