OpenSSH is a free suite of applications for the SSH protocol, developed and maintained by the OpenBSD project.
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"