Ubuntu Security Notice USN-474-1
12th June, 2007
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 7.04
- Ubuntu 6.10
- Ubuntu 6.06 LTS
It was discovered that xscreensaver did not correctly validate the
return values from network authentication systems such as LDAP or NIS.
A local attacker could bypass a locked screen if they were able to
interrupt network connectivity.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 7.04:
- xscreensaver 4.24-5ubuntu2.1
- Ubuntu 6.10:
- xscreensaver 4.24-4ubuntu2.1
- Ubuntu 6.06 LTS:
- xscreensaver 4.23-4ubuntu8.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to restart your session to
effect the necessary changes.