full-disclosure-uk May 2007 archive
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full-disclosure-uk: [Full-disclosure] n.runs-SA-2007.012 - Avira

[Full-disclosure] n.runs-SA-2007.012 - Avira Antivir Antivirus TAR Denial of Service

From: <security_at_nospam>
Date: Wed May 30 2007 - 20:27:42 GMT
To: <full-disclosure@lists.grok.org.uk>, "'BugTraq'" <bugtraq@securityfocus.com>

n.runs AG http://www.nruns.com/ security(at)nruns.com n.runs-SA-2007.012 30-May-2007
Vendor: Avira GmbH, http://www.avira.com Affected Product: Avira Antivir Antivirus Vulnerability: Infinity Loop 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 engine 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 engine.

In detail, the following flaw was determined:

  • Infinite Loop in .TAR files parsing

This problem can lead to remote denial of service provoked by high CPU consume and exhaustion of storage resource 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 mechanism.

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@nruns.com 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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