Debian Security Advisory

DLA-2064-1 ldm -- LTS security update

Date Reported:
10 Jan 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2019-20373.
More information:

It was discovered that a hook script of ldm, the display manager for the Linux Terminal Server Project incorrectly parsed responses from an SSH server which could result in local root privilege escalation.

  • CVE-2019-20373

    LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user's shell lacks support for Bourne shell syntax. This is related to a run-x-session script.

For Debian 8 Jessie, these problems have been fixed in version 2:2.2.15-2+deb8u1.

We recommend that you upgrade your ldm packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: