From: Sune Kloppenborg Jeppesen <jaervosz@gentoo.org.>
To: [email protected]Subject: [ GLSA 200609-17 ] OpenSSH: Denial of Service
Date: Wed, 27 Sep 2006 19:02:12 +0200
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Organization: Gentoo Linux Security Team
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Gentoo Linux Security Advisory GLSA 200609-17
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http://security.gentoo.org/
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Severity: Normal
Title: OpenSSH: Denial of Service
Date: September 27, 2006
Bugs: #148228
ID: 200609-17
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Synopsis
========
A flaw in the OpenSSH daemon allows remote unauthenticated attackers to
cause a Denial of Service.
Background
==========
OpenSSH is a free suite of applications for the SSH protocol, developed
and maintained by the OpenBSD project.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/openssh < 4.3_p2-r5 >= 4.3_p2-r5
Description
===========
Tavis Ormandy of the Google Security Team discovered a Denial of
Service vulnerability in the SSH protocol version 1 CRC compensation
attack detector.
Impact
======
A remote unauthenticated attacker may be able to trigger excessive CPU
usage by sending a pathological SSH message, denying service to other
legitimate users or processes.
Workaround
==========
The system administrator may disable SSH protocol version 1 in
/etc/ssh/sshd_config.
Resolution
==========
All OpenSSH users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.3_p2-r3"
References
==========
[ 1 ] CVE-2006-4924
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4924
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200609-17.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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2006 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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