A Pam-python regression update has been released for Ubuntu Linux 16.04 LTS and 18.04 LTS.

USN-4552-3: Pam-python regression

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Ubuntu Security Notice USN-4552-3
October 28, 2020

pam-python regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- pam-python: Enables PAM modules to be written in Python

Details:

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 LTS:
libpam-python 1.0.6-1.1+deb10u1ubuntu0.1

Ubuntu 16.04 LTS:
libpam-python 1.0.4-1.1+deb8u1ubuntu0.1

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

References:
  https://usn.ubuntu.com/4552-3
  https://usn.ubuntu.com/4552-1
CVE-2019-16729

Package Information:
  https://launchpad.net/ubuntu/+source/pam-python/1.0.6-1.1+deb10u1ubuntu0.1
  https://launchpad.net/ubuntu/+source/pam-python/1.0.4-1.1+deb8u1ubuntu0.1