========================================================================== Ubuntu Security Notice USN-4269-1 February 05, 2020 systemd vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 19.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 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 PIDFile files. A local attacker could possibly use this issue to trick systemd into killing privileged processes. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-16888) It was discovered that systemd incorrectly handled certain udevadm trigger commands. A local attacker could possibly use this issue to cause systemd to consume resources, leading to a denial of service. (CVE-2019-20386) Jann Horn discovered that systemd incorrectly handled services that use the DynamicUser property. A local attacker could possibly use this issue to access resources owned by a different service in the future. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-3843, CVE-2019-3844) Tavis Ormandy discovered that systemd incorrectly handled certain Polkit queries. A local attacker could use this issue to cause systemd to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges. (CVE-2020-1712) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 19.10: systemd 242-7ubuntu3.6 Ubuntu 18.04 LTS: systemd 237-3ubuntu10.38 Ubuntu 16.04 LTS: systemd 229-4ubuntu21.27 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://usn.ubuntu.com/4269-1 CVE-2018-16888, CVE-2019-20386, CVE-2019-3843, CVE-2019-3844, CVE-2020-1712 Package Information: https://launchpad.net/ubuntu/+source/systemd/242-7ubuntu3.6 https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.38 https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.27