Home / mailings [gentoo-announce] [ GLSA 200707-13 ] Fail2ban: Denial of Service
Posted on 29 July 2007
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Gentoo Linux Security Advisory GLSA 200707-13
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http://security.gentoo.org/
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Severity: Normal
Title: Fail2ban: Denial of Service
Date: July 28, 2007
Bugs: #181214
ID: 200707-13
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Synopsis
========
Fail2ban is vulnerable to a Denial of Service attack.
Background
==========
Fail2ban is a tool for parsing log files and banning IP addresses which
make too many password failures.
Affected packages
=================
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Package / Vulnerable / Unaffected
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1 net-analyzer/fail2ban < 0.8.0-r1 >= 0.8.0-r1
Description
===========
A vulnerability has been discovered in Fail2ban when parsing log files.
Impact
======
A remote attacker could send specially crafted SSH login banners to the
vulnerable host, which would prevent any ssh connection to the host and
result in a Denial of Service.
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-0.8.0-r1"
References
==========
[ 1 ] Original advisory
http://www.ossec.net/en/attacking-loganalysis.html#fail2ban
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200707-13.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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