[Full-Disclosure] RAV Antivirus : Buffer Overflow in Online Scanning ActiveX

From: Tri Huynh (trihuynh_at_zeeup.com)
Date: 07/18/03

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    To: <full-disclosure@lists.netsys.com>, <bugtraq@securityfocus.com>
Date: Fri, 18 Jul 2003 01:21:00 -0700

    RAV Online Scanning ActiveX Buffer Overflow
    =================================================

    PROGRAM: RAV ONLINE SCANNING ACTIVEX
    HOMEPAGE: www.ravantivirus.com
    VULNERABLE VERSIONS: Online Version Only

    DESCRIPTION
    =================================================

    RAV Online Scanning is a free antivirus scanner for internet users. It is
    run on the user's browsers as an ActiveX.

    DETAILS
    =================================================

    The ActiveX file called ravonline.dll has a function named browseForFolder()
    that can be overflowed by passing a very long string as an argument. Since
    the function browseForFolder() is imported from Shell32.dll, so it looks
    like
    the problem maybe lay in the Shell32.dll but not in the ActiveX itself (I am
    still working on that) however users that use RAV Online Scanning are still
    vulnerable to the overflow.

    WORKAROUND
    =================================================

    Delete the old ActiveX(ravonline.dll) in the "Downloaded Program Files" in
    your Windows Directory. Vendor already got noticed but no response yet.

    CREDITS
    =================================================

    Discovered by Tri Huynh from Sentry Union

    DISLAIMER
    =================================================

    The information within this paper may change without notice. Use of
    this information constitutes acceptance for use in an AS IS condition.
    There are NO warranties with regard to this information. In no event
    shall the author be liable for any damages whatsoever arising out of
    or in connection with the use or spread of this information. Any use
    of this information is at the user's own risk.

    FEEDBACK
    =================================================

    Please send suggestions, updates, and comments to: trihuynh@zeeup.com

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