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Gentoo Linux Security Advisory                           GLSA 200702-05
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                                            https://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:

  https://security.gentoo.org/glsa/200702-05

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
https://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.

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