[ISN] Flaw means virus could disable Norton Anti-Virus

From: InfoSec News (isnat_private)
Date: Tue Jun 26 2001 - 01:36:52 PDT

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    By John Leyden
    Posted: 25/06/2001 at 09:52 GMT
    A security loophole has been discovered in Norton Anti-Virus (NAV)
    which could allow the creation of a virus able to shut down the
    software on a user's machine.
    In an advisory available here, Peter Kruse of Scandinavian telco Telia
    argues that a "very obvious and unsafe registry entry that makes it
    quite simple to disable NAV 2001".
    According to Kruse, if the registry key NAV 2001 is changed in value
    Norton Anti-Virus startup is disabled, leaving users without any
    protection against viruses when they restart their machine.
    The upshot of this, said Kruse, is that using either a virus or a
    remote administrator tool, a cracker could take out a Symantec user's
    antivirus protection, which could be restored only by reinstalling the
    software or editing the registry entry.
    Symantec said the issue was been handled out of its US office and we
    weren't able to speak to anyone before press (pub) time. According to
    American reports, however, Symantec has played down the significance
    of the potential vulnerability by saying it only affects the product's
    on-demand scanner and not its core real-time scanner, which is called
    Despite this Symantec is taking the issue seriously enough to announce
    plans that it will change the way Norton AntiVirus uses a PC system's
    registry starting with NAV 2002.
    Previous versions of NAV, Symantec's flagship antivirus product (prior
    to NAV 2001), were not tested for the vulnerability so it's not known
    if users of older products are affected by the alleged bug.
    [ Advisory at: http://www.securityfocus.com/archive/100/192255 ]
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