Title: OpenSSH: Denial of Service ([glsa=200609-17]GLSA 200609-17[/glsa])
Severity: normal
Exploitable: remote
Date: September 27, 2006
Bug(s): #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: net-misc/openssh
Vulnerable: < 4.3_p2-r5
Unaffected: >= 4.3_p2-r5
Architectures: All supported architectures
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:
Code: Select all
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.3_p2-r5"References
CVE-2006-4924