Advisories, September 27, 2006Sep 28, 2006, 03:45 (0 Talkback[s])
Gentoo Linux Security Advisory GLSA 200609-17
A flaw in the OpenSSH daemon allows remote unauthenticated attackers to cause a Denial of Service.
OpenSSH is a free suite of applications for the SSH protocol, developed and maintained by the OpenBSD project.
Package / Vulnerable / Unaffected
1 net-misc/openssh < 4.3_p2-r5 >= 4.3_p2-r5
Tavis Ormandy of the Google Security Team discovered a Denial of Service vulnerability in the SSH protocol version 1 CRC compensation attack detector.
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.
The system administrator may disable SSH protocol version 1 in /etc/ssh/sshd_config.
All OpenSSH users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/openssh-4.3_p2-r3"
[ 1 ] CVE-2006-4924
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
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@example.com or alternatively, you may file a bug at http://bugs.gentoo.org.
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.
rPath Security Advisory: 2006-0174-1
Previous versions of the openssh package are vulnerable to a remote denial of service attack that cause the server to consume CPU when presented with certain data. They also have a bug (not a vulnerability) that causes the client to crash harmlessly instead of exiting cleanly under some attacks; this is not a vulnerability but is also fixed in this update.
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