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Debian Security Advisory DSA 1638-1 (openssh)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update to openssh announced via advisory DSA 1638-1.
Insight
Insight
It has been discovered that the signal handler implementing the login timeout in Debian's version of the OpenSSH server uses functions which are not async-signal-safe, leading to a denial of service vulnerability (CVE-2008-4109). The problem was originally corrected in OpenSSH 4.4p1 (CVE-2006-5051), but the patch backported to the version released with etch was incorrect. Systems affected by this issue suffer from lots of zombie sshd processes. Processes stuck with a [net] process title have also been observed. Over time, a sufficient number of processes may accumulate such that further login attempts are impossible. Presence of these processes does not indicate active exploitation of this vulnerability. It is possible to trigger this denial of service condition by accident. For the stable distribution (etch), this problem has been fixed in version 4.3p2-9etch3. For the unstable distribution (sid) and the testing distribution (lenny), this problem has been fixed in version 4.6p1-1. We recommend that you upgrade your openssh packages.
Solution
Solution
https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201638-1