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USN-4668-3: python-apt regression

4 January 2021

USN-4668-1 introduced a regression in python-apt.




USN-4668-1 fixed vulnerabilities in python-apt. The update caused a
regression when using certain APIs with a file handle. This update fixes
the problem.

We apologize for the inconvenience.

Original advisory details:

Kevin Backhouse discovered that python-apt incorrectly handled resources. A
local attacker could possibly use this issue to cause python-apt to consume
resources, leading to a denial of service.

Update instructions

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

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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