Ubuntu alert USN-5226-1 (systemd)

From:
             
 
Alex Murray <alex.murray@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-5226-1] systemd vulnerability
Date:
             
 
Thu, 13 Jan 2022 11:40:33 +1030
Message-ID:
             
 
<87y23ka15h.fsf@canonical.com>
==========================================================================
Ubuntu Security Notice USN-5226-1
January 13, 2022

systemd vulnerability
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

systemd-tmpfiles could be made to crash or have other unspecified impacts.

Software Description:
- systemd: system and service manager

Details:

It was discovered that systemd-tmpfiles employed uncontrolled recursion
when removing deeply nested directory hierarchies. A local attacker could
exploit this to cause systemd-tmpfiles to crash or have other unspecified
impacts.

Update instructions:

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

Ubuntu 21.10:
  systemd                         248.3-1ubuntu8.2

Ubuntu 21.04:
  systemd                         247.3-3ubuntu3.7

Ubuntu 20.04 LTS:
  systemd                         245.4-4ubuntu3.15

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

References:
  https://ubuntu.com/security/notices/USN-5226-1
  CVE-2021-3997

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/248.3-1ubunt...
  https://launchpad.net/ubuntu/+source/systemd/247.3-3ubunt...
  https://launchpad.net/ubuntu/+source/systemd/245.4-4ubunt...
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