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[ GLSA 200609-17 ] OpenSSH: Denial of Service
From: Sune Kloppenborg Jeppesen <jaervosz () gentoo org>
Date: Wed, 27 Sep 2006 19:02:12 +0200
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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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- [ GLSA 200609-17 ] OpenSSH: Denial of Service Sune Kloppenborg Jeppesen (Sep 27)