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USN-4552-3: Pam-python regression

28 October 2020

USN-4552-1 and USN-4552-2 introduced a regression in Pam-python



  • pam-python - Enables PAM modules to be written in Python


USN-4552-1 and USN-4552-2 fixed a vulnerability in Pam-python. The update
introduced a regression which prevented PAM modules written in Python from
importing python modules from site-specific directories.

We apologize for the inconvenience.

Original advisory details:

Malte Kraus discovered that Pam-python mishandled certain environment variables.
A local attacker could potentially use this vulnerability to execute programs
as root.

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04

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


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