Joined: 12 May 2004
|Posted: Wed Sep 27, 2006 6:26 pm Post subject: [ GLSA 200609-17 ] OpenSSH: Denial of Service
|Gentoo Linux Security Advisory
Title: OpenSSH: Denial of Service (GLSA 200609-17)
Date: September 27, 2006
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.
Vulnerable: < 4.3_p2-r5
Unaffected: >= 4.3_p2-r5
Architectures: All supported architectures
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-r5"
Last edited by GLSA on Thu Sep 28, 2006 4:17 am; edited 1 time in total