Ubuntu Security Notice USN-5013-1

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Ubuntu Security Notice USN-5013-1
July 20, 2021

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

– Ubuntu 21.04
– Ubuntu 20.10
– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS

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)

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.

References:
https://ubuntu.com/security/notices/USN-5013-1
CVE-2020-13529, CVE-2021-33910

Package Information:
https://launchpad.net/ubuntu/+source/systemd/247.3-3ubuntu3.4
https://launchpad.net/ubuntu/+source/systemd/246.6-1ubuntu1.7
https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.10
https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.49