NOD32 Antivirus ASPACK and FSG parsing Divide by Zero Advisory

Advisory Content :

n.runs AG
http://www.nruns.com/ security(at)nruns.com
n.runs-SA-2007.018 20-Jul-2007
________________________________________________________________________

Vendor: ESET, http://eset.com
Affected Products: ESET NOD32 Antivirus
Vulnerability: Denial of Service (remote)
Risk: MODERATE

________________________________________________________________________

Vendor communication:

2007/05/07 Initial notification to ESET
2007/05/07 ESET Response
2007/05/07 PoC files sent to ESET
2007/05/10 ESET validate the vulnerability
2007/05/24 ESET made available the updates
________________________________________________________________________

Overview:

Founded in 1992, ESET is a global provider of security software for
enterprises and consumers. ESETâ??s award-winning, antivirus software
system, NOD32, provides real-time protection from known and unknown
viruses, spyware, rootkits and other malware. NOD32 offers the smallest,
fastest and most advanced protection available, with more Virus Bulletin
100% Awards than any other antivirus product. ESET was named to
Deloitteâ??s Technology Fast 500 five years running, and has an extensive
partner network, including corporations like Canon, Dell and Microsoft.
ESET has offices in Bratislava, SK; Bristol, U.K.; Buenos Aires, AR;
Prague, CZ; San Diego, USA; and is represented worldwide in more than 100
countries.
The broad product platform protects Windows, Linux, Novell and MS DOS
machines.

Description:

A remotely exploitable vulnerability has been found in the file parsing
engine.

In detail, the following flaw was determined:

- Divide by Zero in ASPACK and FSG packed files parsing

Impact:

This problem can lead to remote denial of service if an attacker carefully
crafts a file that exploits the aforementioned vulnerability. The
vulnerability is present in NOD32 Antivirus software versions prior to the
update v.2.2289.

Solution:

The vulnerability was reported on May 07 and an update has been issued on
May 24 to solve this vulnerability through the regular update mechanism.

________________________________________________________________________

Credit:
Bugs found by Sergio Alvarez of n.runs AG.
________________________________________________________________________

References:
http://www.eset.com/joomla/index.php?option=com_content&task=view&id=346
9&Itemid=26

This Advisory and Upcoming Advisories:
http://www.nruns.com/security_advisory.php
http://www.nruns.com/parsing-engines-advisories.php
________________________________________________________________________

Unaltered electronic reproduction of this advisory is permitted. For all
other reproduction or publication, in printing or otherwise, contact
security (at) nruns (dot) com [email concealed] for permission. Use of the
advisory constitutes acceptance for use in an "as is" condition. All
warranties are excluded. In no event shall n.runs be liable for any damages
whatsoever including direct, indirect, incidental, consequential, loss of
business profits or special damages, even if n.runs has been advised of the
possibility of such damages.

Copyright 2007 n.runs AG. All rights reserved. Terms of apply.

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NOD32 Antivirus ASPACK and FSG parsing Divide by Zero Advisory