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Gentoo alert 200609-17 (openssh)

From:  Sune Kloppenborg Jeppesen <jaervosz@gentoo.org>
To:  gentoo-announce@lists.gentoo.org
Subject:  [gentoo-announce] [ GLSA 200609-17 ] OpenSSH: Denial of Service
Date:  Wed, 27 Sep 2006 19:02:12 +0200
Cc:  bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk, security-alerts@linuxsecurity.com

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200609-17 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: OpenSSH: Denial of Service Date: September 27, 2006 Bugs: #148228 ID: 200609-17 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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 security@gentoo.org 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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