1. Ubuntu Security Notices
  2. USN-355-1

USN-355-1: openssh vulnerabilities

Publication date

2 October 2006

Overview

openssh vulnerabilities

Releases

Details

Tavis Ormandy discovered that the SSH daemon did not properly handle
authentication packets with duplicated blocks. By sending specially
crafted packets, a remote attacker could exploit this to cause the ssh
daemon to drain all available CPU resources until the login grace time
expired. (CVE-2006-4924)

Mark Dowd discovered a race condition in the server’s signal handling.
A remote attacker could exploit this to crash the server.
(CVE-2006-5051)

Tavis Ormandy discovered that the SSH daemon did not properly handle
authentication packets with duplicated blocks. By sending specially
crafted packets, a remote attacker could exploit this to cause the ssh
daemon to drain all available CPU resources until the login grace time
expired. (CVE-2006-4924)

Mark Dowd discovered a race condition in the server’s signal handling.
A remote attacker could exploit this to crash the server.
(CVE-2006-5051)

Update instructions

In general, a standard system upgrade is sufficient to effect the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
6.06 dapper openssh-server –  1:4.2p1-7ubuntu3.1
5.10 breezy openssh-server –  1:4.1p1-7ubuntu4.2
5.04 hoary openssh-server –  1:3.9p1-1ubuntu2.3

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References

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