Ubuntu 21.04 USN-5013-1: Systemd Issues Cause DoS Risks

ubuntu

July 20, 2021

Several security issues were fixed in systemd.

Summary

Several security issues were fixed in systemd.

Software Description:

- systemd: system and service manager

Details:

It was discovered that systemd incorrectly handled certain mount paths. A

local attacker could possibly use this issue to cause systemd to crash,

resulting in a denial of service. (CVE-2021-33910)

Mitchell Frank discovered that systemd incorrectly handled DHCP FORCERENEW

packets. A remote attacker could possibly use this issue to reconfigure

servers. (CVE-2020-13529)

Topics Covered

security advisory denial of service remote attack Ubuntu systemd

Update Instructions

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

Ubuntu 21.04:
  systemd                         247.3-3ubuntu3.4

Ubuntu 20.10:
  systemd                         246.6-1ubuntu1.7

Ubuntu 20.04 LTS:
  systemd                         245.4-4ubuntu3.10

Ubuntu 18.04 LTS:
  systemd                         237-3ubuntu10.49

After a standard system update you need to reboot your computer to make all
the necessary changes.