[Symantec Security Advisor] Symantec Security Check ActiveX Buffer Overflow

From: Sym Security (symsecurity_at_symantec.com)
Date: 06/24/03

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    To: bugtraq@securityfocus.com
Date: Tue, 24 Jun 2003 11:08:39 -0600

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    Title: Symantec Security Check ActiveX Buffer Overflow

    Date: Monday, June 23, 2003 09:15:19 PM
    Threat: Moderate
    Impact: System Access
    Product: Symantec Security Check

    Situation Overview:
    Symantec Security Check is a free web-based tool that enables users
    to test their computer's exposure to a wide range of on-line threats.
    As part of running the check, users may install an ActiveX Control
    which remains on the user's system even after the check has
    completed.

    The current ActiveX Control - which can be named Symantec RuFSI
    Utility Class or Symantec RuFSI Registry Information Class - contains
    a buffer overflow exploit. The buffer overflow can be exploited when
    the user with this ActiveX Control visits a malicious website intent
    on exploiting this vulnerability. The exploit can cause Internet
    Explorer to crash and/or the execution of arbitrary code on the
    user's computer.

    Symantec has replaced the current ActiveX Control on the Symantec
    Security Check website so that new visitors will not be affected by
    the exploit.

    Recent visitors to Symantec Security Check should revisit the site
    and run a new Security Scan. By running a new scan, the previous
    ActiveX Control will be replaced by an updated ActiveX Control that
    fixes the buffer overflow condition.

    Advanced users can attempt to delete the ActiveX Control by rebooting
    and then going into the system folder: %SystemRoot%\Downloaded
    Program Files\ and delete "rufsi.dll". This must be done by using the
    command prompt and the user must not be on the Symantec Security
    Check site at the time.

    Statement:
    Symantec was made aware of Symantec Security Check's ActiveX buffer
    overflow vulnerability today through a public posting on the
    Internet. Since hearing of the exploit Symantec has worked diligently
    to replace the ActiveX Control on Symantec Security Check. Through
    Symantec's customer support, we are working with users who may have
    downloaded the exploited ActiveX Control to remove it from their
    systems. Although Symantec Security Check is available to both PC and
    Mac users, this issue only affects PCs.

    Symantec Vulnerability Response Process:
    Symantec is a strong supporter of responsible disclosure. It is our
    goal to establish a working relationship with researchers who
    discover vulnerabilities in Symantec products and to develop, test
    and make available updates prior to there being publicly disclosed.
    It is ours as well as much of the security communities belief that
    premature disclosure can pose a serious threat to the internet. Such
    disclosure should be discouraged.

    Symantec Security

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