[USN-5013-2] systemd vulnerabilities

========================================================================== Ubuntu Security Notice USN-5013-2 July 20, 2021
systemd vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM
Summary:
Several security issues were fixed in systemd.
Software Description: – systemd: system and service manager
Details:
USN-5013-1 fixed several vulnerabilities in systemd. This update provides the corresponding update for Ubuntu 16.04 ESM.
Original advisory 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 16.04 ESM: systemd 229-4ubuntu21.31+esm1
After a standard system update you need to reboot your computer to make all the necessary changes.
References: ubuntu.com/security/notices/USN-5013-2 ubuntu.com/security/notices/USN-5013-1 CVE-2020-13529, CVE-2021-33910