Ubuntu alert USN-4533-1 (ldm)

From:
             
 
Avital Ostromich <avital.ostromich@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-4533-1] LTSP Display Manager vulnerabilities
Date:
             
 
Tue, 22 Sep 2020 17:04:20 -0400
Message-ID:
             
 
<cfae7936-257f-ed2b-5183-f0a8ae6f7863@canonical.com>
==========================================================================
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+deb1...


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