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[gentoo-announce] [ GLSA 201406-23 ] DenyHosts: Denial of Service

Posted on 25 June 2014
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 201406-23
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http://security.gentoo.org/
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Severity: Normal
Title: DenyHosts: Denial of Service
Date: June 25, 2014
Bugs: #495130
ID: 201406-23

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Synopsis
========
A vulnerability in DenyHosts could allow a remote attacker to create a
Denial of Service condition.

Background
==========
DenyHosts is a script intended to be run by Linux system administrators
to help thwart SSH server attacks.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-admin/denyhosts < 2.6-r9 >= 2.6-r9

Description
===========
DenyHosts does not properly define the regular expressions used when
parsing SSH authentication logs.

Impact
======
A remote attacker could possibly cause a Denial of Service condition
via a crafted login name.

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

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

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-admin/denyhosts-2.6-r9"

References
==========
[ 1 ] CVE-2013-6890
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-6890

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

http://security.gentoo.org/glsa/glsa-201406-23.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
https://bugs.gentoo.org.

License
=======
Copyright 2014 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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