Christian Herzog discovered that it was possible to connect to any LTSP client’s X session over the network. A remote attacker could eavesdrop on X events, read window contents, and record keystrokes, possibly gaining access to private information.
The problem can be corrected by updating your system to the following package versions:
6 May 2008
A security issue affects these releases of Ubuntu and its derivatives:
Christian Herzog discovered that it was possible to connect to any LTSP client’s X session over the network. A remote attacker could eavesdrop on X events, read window contents, and record keystrokes, possibly gaining access to private information.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to update your LTSP client chroots to effect the necessary changes. For more details, please see: http://doc.ubuntu.com/edubuntu/edubuntu/handbook/C/ltsp-updates.html#id531224
Vulmon