GLSA-200609-17 : OpenSSH: Denial of Service
High Nessus Plugin ID 22464
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200609-17 (OpenSSH: Denial of Service)
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.
SolutionAll OpenSSH users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-misc/openssh-4.3_p2-r5'