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.
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Ubuntu Security Notice USN-4533-1
September 22, 2020
ldm vulnerabilities
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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