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TUCoPS :: Linux :: Gentoo :: c07-2363.htm

Fail2ban: Denial of Service



Fail2ban: Denial of Service
Fail2ban: Denial of Service




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Gentoo Linux Security Advisory                           GLSA 200702-05
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: Fail2ban: Denial of Service
      Date: February 16, 2007
      Bugs: #157166
        ID: 200702-05

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Synopsis
=======
A flaw in Fail2ban may allow remote attackers to deny access to
arbitrary hosts.

Background
=========
Fail2ban monitors log files for failed authentication attempts and can
block hosts responsible for repeated attacks.

Affected packages
================
    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/fail2ban       < 0.6.2                      >= 0.6.2

Description
==========
A flaw in the method used to parse log entries allows remote,
unauthenticated attackers to forge authentication attempts from other
hosts.

Impact
=====
A remote attacker can add arbitrary hosts to the block list, denying
legitimate users access to a resource.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Fail2ban users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-analyzer/fail2ban-0.6.2"

References
=========
  [ 1 ] CVE-2006-6302
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6302 

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200702-05.xml 

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at 
http://bugs.gentoo.org. 

License
======
Copyright 2007 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5 

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