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Ubuntu 20.04 LTS USN-4533-1: ldm Privilege Escalation Risk

ubuntu
Calendar Grey September 22, 2020
Dist Ubuntu Esm H88
Fedora Security Advisory FSA-2023-456 addresses critical ldm flaws affecting user access levels. Ensure your system is protected.
LTSP Display Manager could be made to escalate user privileges.

Summary

LTSP Display Manager could be made to escalate user privileges.

Software Description:

- ldm: LTSP display manager

Details:

Veeti Veteläinen discovered that the LTSP Display Manager (ldm)

incorrectly handled user logins from unsupported shells. A local attacker

could possibly use this issue to gain root privileges. (CVE-2019-20373)

Topics%20covered

Topics Covered

security advisory privilege escalation local attack ubuntu ldm

Update Instructions

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

Ubuntu 20.04 LTS:
  ldm                             2:2.18.06-1+deb10u1build0.20.04.1
  ldm-server                      2:2.18.06-1+deb10u1build0.20.04.1

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4533-1

https://bugs.launchpad.net/ltsp/+bug/1839431

Severity
critical
Lowest
Low
Medium
High
Critical

September 22, 2020

Topics%20covered

Topics Covered

security advisory privilege escalation local attack ubuntu ldm

Package Information

https://launchpad.net/ubuntu/+source/ldm/2:2.18.06-1+deb10u1build0.20.04.1

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