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Ubuntu Security Notice USN-4533-1

Ubuntu Security Notice USN-4533-1
Posted Sep 23, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4533-1 - Veeti Veteläinen discovered that the LTSP Display Manager incorrectly handled user logins from unsupported shells. A local attacker could possibly use this issue to gain root privileges.

tags | advisory, shell, local, root
systems | linux, ubuntu
advisories | CVE-2019-20373
SHA-256 | d21d981ecc29bd17909e7ea728408b6c17d2f5dec1bee6846f8e041e59f4f552

Ubuntu Security Notice USN-4533-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4533-1
September 22, 2020

ldm vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS

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)

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://usn.ubuntu.com/4533-1
https://launchpad.net/bugs/1839431

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