USN-610-1: LTSP vulnerability

6 May 2008

ltsp vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 7.10
  • Ubuntu 7.04
  • Ubuntu 6.06 LTS

Software Description

  • ltsp


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.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 7.10
ldm -
Ubuntu 7.04
ldm -
Ubuntu 6.06 LTS
ldm - 0.87.1

To update your system, please follow these instructions:

After a standard system upgrade you need to update your LTSP client chroots to effect the necessary changes. For more details, please see: