Re: symlink vul for Antivir / Linux Version 2.0.9-9 (maybe lower)

From: AntiVir Support (support_at_antivir.de)
Date: 01/27/04

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    Date: Tue, 27 Jan 2004 15:55:03 +0100
To: bugtraq@securityfocus.com

    Update Information:
    -------------------
    On 14 January 2004 we provided a new version of our software that was no
    longer vulnerable to the exploit posted by <l0om@excluded.org>. This
    version was 2.0.9-11.

    It was later determined that a more aggressive brute force symlink
    attack would be possible with this version. Therefore, on 15 January
    2004 we provided another new version of our software that no longer was
    vulnerable to any symlink attacks using the temporary PID files. This
    version was 2.0.9-12. Users were able to attain the updated versions
    using the internet updater:

            $ antivir --update

    or by downloading the latest software package from the website:

            http://www.antivir.de/download/download.htm

    Users may check their currently installed version by running:

            $ antivir --version

    The sigificant version information is:

            product version: 2.0.9-12

    This version and all subsequent versions are not vulnerable to any
    symlink attacks using the temporary PID files.

    Solution Information:
    ---------------------
    Previous versions had created temporary files without first checking if
    the file already existed. A check for existing files has now been added.
    If the file exists, it is removed. A new file is then created using the
    exclusive flag. If this is unsuccessful, no temporary file will be created.

    Users should not use an NFS mount for AntiVir temporary files since file
    locking over NFS does not work on most implementations. As default,
    AntiVir uses /tmp or /var/tmp for temporary files.

    Addional Information:
    ---------------------
    It should be noted that H+BEDV Datentechnik GmbH was not first contacted
    by <l0om@excluded.org>. We learned of the problem through the bugtraq
    mailing list.

    We ask that all security-related problems be directed to
    <security@antivir.de> before being posted publicly. This gives us a
    chance to evaluate the problem and determine a course of action without
    putting our users at risk. We appreciate your cooperation. 

    -- 
AntiVir Support
H+BEDV Datentechnik GmbH
<mailto:support@antivir.de>
Lindauer Strasse 21, 88069 Tettnang, Germany
Tel.: +49 (0)7542 500-0
Fax : +49 (0)7542 52510
<http://www.antivir.de>

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