[UNIX] JSBoard Multiple Extensions Vulnerability

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

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    To: list@securiteam.com
Date: 28 Dec 2004 16:48:59 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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      JSBoard Multiple Extensions Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://kldp.net/projects/jsboard/> JSBoard is "one of widely used web
    BBS applications in Korea". However, an input validation flaw in JSBoard
    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:
     * JSBoard version 2.0.8 and prior
     * JSBoard version JSBoard 1.3.11 and prior

    Immune Systems:
     * JSBoard version 2.0.9 or newer
     * JSBoard version JSBoard 1.3.12 or newer

    JSBoard doesn't implemented any type of check in "include/parse.php" 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 JSBoard developer notified
    2004-12-09 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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