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USN-5395-2: networkd-dispatcher regression

4 May 2022

USN-5395-1 introduced a regression in networkd-dispatcher.




USN-5395-1 fixed vulnerabilities in networkd-dispatcher. Unfortunately
that update was incomplete and could introduce a regression. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that networkd-dispatcher incorrectly handled internal
scripts. A local attacker could possibly use this issue to cause a race
condition, escalate privileges and execute arbitrary code.
(CVE-2022-29799, CVE-2022-29800)

Update instructions

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

Ubuntu 22.04
Ubuntu 21.10
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.