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Norton AntiVirus Scanner Remote Denial Of Service Vulnerability [Part: !!!]
From: bipin gautam <visitbipin () yahoo com>
Date: Thu, 8 Jul 2004 17:40:07 -0700 (PDT)

Anti-Virus Scanner Remote Denial Of Service
Vulnerability [Part: !!!]

*vulnerable [...only tested on!]

Symantec Norton AntiVirus 2003 Professional Edition
Symantec Norton AntiVirus 2002

*not vulnerable
Mcafee 7*
Mcafee 8*

Risk Impact: Medium
Remote: yes

While having a virus scan [automatic/manual] of some
specially crafted compressed files; NAV triggers a DoS
using 100% CPU for a very long time. Morover, NAV is
unable to stop the scan in middle, even if the user
wishes to manually stop the virus scan. Then, in this
situation the only alternate is to kill the process. 
--- [Proof of Concept] ---
Please download this file.

    <---  For symantec.

    <--- A bzip2 file, test it on other AV products,

The file contains, 'EICAR Test String' burried in
49647 directories. This is just a RAW 'proof of
concept'. A few 100kb's of compressed file could be
crafted in a way... NAV will take hours or MIGHT even
days to complete the scan causing 100% cup use in
email gateways for hours. The compressed archive must
not necessarily be a '.zip' to trigger this attack.

I've decided not to contact SYMANTEC in any of my
advisories since their "security responce team" is too
slow to responce any reported incidence.  PLEASE:
...test this issue with other AV / trojan scanners as
they might also be vulnerable. 

Bipin Gautam

Disclaimer: The information in the advisory is
believed to be accurate at the time of printing based
on currently available information. Use of the
information constitutes acceptance for use in an AS IS
condition. There are no warranties with regard to this
information. Neither the author nor the publisher
accepts any liability for any direct, indirect or
consequential loss or damage arising from use of, or
reliance on this information.

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