Ubuntu Security Notice USN-649-1
1st October, 2008
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 7.10
- Ubuntu 7.04
- Ubuntu 6.06 LTS
It was discovered that the ForceCommand directive could be bypassed.
If a local user created a malicious ~/.ssh/rc file, they could execute
arbitrary commands as their user id. This only affected Ubuntu 7.10.
USN-355-1 fixed vulnerabilities in OpenSSH. It was discovered that the
fixes for this issue were incomplete. A remote attacker could attempt
multiple logins, filling all available connection slots, leading to a
denial of service. This only affected Ubuntu 6.06 and 7.04.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 7.10:
- openssh-server 1:4.6p1-5ubuntu0.6
- Ubuntu 7.04:
- openssh-server 1:4.3p2-8ubuntu1.5
- Ubuntu 6.06 LTS:
- openssh-server 1:4.2p1-7ubuntu3.5
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