USN-355-1: openssh vulnerabilities
2 October 2006
openssh vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 6.06 LTS
- Ubuntu 5.10
- Ubuntu 5.04
Software Description
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)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 6.06 LTS
- openssh-server - 1:4.2p1-7ubuntu3.1
- Ubuntu 5.10
- openssh-server - 1:4.1p1-7ubuntu4.2
- Ubuntu 5.04
- openssh-server - 1:3.9p1-1ubuntu2.3
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the necessary changes.