Two days ago, a major security flaw was discovered in Debian's SSL packages:

http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-0166
http://lists.debian.org/debian-security-announce/2008/msg00152.html

All 64 Studio users who ever use SSH to allow remote access should update their systems against the http://security.debian.org/ repository, unless they have already done so today.

In System Tools -> Synaptic Package Manager, go to Settings -> Repositories. The security repository should be marked Enabled, with a check on the left side. If you click on this line, the details of the security repository should be shown as follows:

Binary (deb)
URI: http://security.debian.org/
Distribution: etch/updates
Section(s): main

Click OK, then the Reload button, then the Mark All Upgrades button. Then click Apply. Several package updates will be downloaded and Synaptic will prompt you about services that need to be restarted.

After the update, you can run the program:

$ ssh-vulnkey

to find out if you have any of the known vulnerable keys on your machine. Even if you don't have any known vulnerable keys, you should delete all keys on your system and generate fresh keys.