n.runs AG             
http://www.nruns.com/                     security(at)nruns.com
n.runs-SA-2007.015                                           04-Jun-2007
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Vendor:             F-Secure Corporation, http://www.f-secure.com
Affected Products:      
F-Secure Anti-Virus for Workstations version 7.00 and earlier
F-Secure Anti-Virus for Windows Servers version 7.00 and earlier
F-Secure Anti-Virus for Citrix Servers version 5.52
F-Secure Anti-Virus for MIMEsweeper version 5.61 and earlier
F-Secure Anti-Virus Client Security version 7.00 and earlier
F-Secure Anti-Virus for MS Exchange version 7.00 and earlier
F-Secure Internet Gatekeeper version 6.60 and earlier 
F-Secure Internet Security 2005, 2006 and 2007
F-Secure Anti-Virus 2005, 2006 and 2007
Solutions based on F-Secure Protection Service for Consumers version 7.00
and earlier
F-Secure Anti-Virus for Linux Servers version 4.65 and earlier
F-Secure Anti-Virus for Linux Gateways version 4.65 and earlier 
F-Secure Anti-Virus Linux Client Security 5.52 and earlier
F-Secure Anti-Virus Linux Server Security 5.52 and earlier
F-Secure Internet Gatekeeper for Linux 2.16 and earlier
Vulnerability:         Infinite Loop DoS (remote) 
Risk:                  HIGH
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Vendor communication:

  2007/05/07    initial notification to F-Secure Corporation
  2007/05/08    F-Secure Corporation Response
  2007/05/08    PGP public keys exchange
  2007/05/08    PoC files sent to F-Secure Corporation
  2007/05/14    F-Secure Corporation acknowledged the PoC files
  2007/05/18    F-Secure Corporation validate the Vulnerability
  2007/05/18    F-Secure Corporation notify update release date
  2007/05/30    F-Secure Corporation released Update with fixes
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Overview:
 
F-Secure Corporation protects consumers and businesses against computer
viruses and other threats from the Internet and mobile networks.
F-Secure award-winning solutions are available for workstations, gateways,
servers and mobile phones. They include antivirus and desktop firewall with
intrusion prevention, antispam and antispyware solutions, as well as network
control solutions for Internet Service Providers.
F-Secure protection is also available as a service through major ISPs, such
as France Telecom, TeliaSonera, PCCW and Charter Communications. F-Secure is
the global market leader in mobile phone protection provided through mobile
operators, such as T-Mobile and Swisscom and mobile handset manufacturers
such as Nokia.

Description:

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

In detail, the following flaw was determined:

- Infinite Loop in FSG packed files parsing


Impact:

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 F-Secure Corporation software products above mentioned in all
platforms supported by the affected products. 

Solution: 
The vulnerability was reported on 07.May.2007 and an update has been issued
on 30.May.2007 to solve this vulnerability. For detailed information about
the fixes follow the link in References [1] section of this document.
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Credit: 
Bugs found by Sergio Alvarez of n.runs AG. 
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References: 
http://www.f-secure.com/security/fsc-2007-3.shtml [1]

This Advisory and Upcoming Advisories:
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@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.