n.runs-SA-2007.011 - Avira Antivir Antivirus UPX parsing Divide by Zero Advisory May 29 2007 03:07AM
security nruns com
n.runs AG
http://www.nruns.com/ security(at)nruns.com
n.runs-SA-2007.011 29-May-2007

Vendor: Avira GmbH, http://www.avira.com
Affected Product: Avira Antivir Antivirus
Vulnerability: Divide by Zero Engine DoS (remote)
Risk: HIGH

Vendor communication:

2007/05/07 initial notification to Avira GmbH
2007/05/07 Avira GmbH Response
2007/05/08 PGP public keys exchange
2007/05/09 PoC files sent to Avira GmbH
2007/05/10 Avira GmbH acknowledged and validated the PoC files
2007/05/16 Avira GmbH sent fix release schedule and fixed
2007/05/17 Sergio Alvarez tested fixed engine
2007/05/23 Avira GmbH released Update with fixes


Avira, a company with over 15 millions customers and more than 250 employees
is a worldwide leading supplier of self-developed security solutions for
professional and private use. With more than 20 years of experience, the
company is one of the pioneers in this field.
In addition to programs specifically for use on single workstations, Avira
primarily offers professional solutions for cross-system protection of
networks on various levels. These include products for workstations, file,
mail and web servers. Gateway computers can be managed as workstation
computers via a central management console for all operating systems. In
addition to the management products of the individual solutions, security
programs for PDAs, smartphones and embedded devices are also offered.
Avira AntiVir Personal, used by millions of private users, represents a
significant contribution to security.


A remotely exploitable vulnerability has been found in the file parsing

In detail, the following flaw was determined:

- Divide by Zero in UPX packed files parsing


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

The vulnerability was reported on 07.May.2007 and an update has been issued
on 23.May.2007 to solve this vulnerability through the regular update

Bugs found by Sergio Alvarez of n.runs AG.


This Advisory and Upcoming Advisories:

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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