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Ubuntu Security Notice USN-4269-1

Ubuntu Security Notice USN-4269-1
Posted Feb 5, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4269-1 - 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, ubuntu
advisories | CVE-2018-16888, CVE-2019-20386, CVE-2020-1712
SHA-256 | 801a330186d2d0b57ba060621d63e9763e16344004da69650cf8fc1454009020

Ubuntu Security Notice USN-4269-1

Change Mirror Download
==========================================================================
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
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