A Python security update has been released for Ubuntu Linux 16.04 LTS and 18.04 LTS.

[USN-6400-1] Python vulnerability

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Ubuntu Security Notice USN-6400-1
September 27, 2023

python2.7, python3.5 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Python could be made to expose sensitive information.

Software Description:
- python2.7: An interactive high-level object-oriented language
- python3.5: An interactive high-level object-oriented language

Details:

It was discovered that Python did not properly provide constant-time
processing for a crypto operation. An attacker could possibly use this
issue to perform a timing attack and recover sensitive information.

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  libpython2.7                    2.7.17-1~18.04ubuntu1.13+esm2
  libpython2.7-minimal      2.7.17-1~18.04ubuntu1.13+esm2
  libpython2.7-stdlib          2.7.17-1~18.04ubuntu1.13+esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  libpython2.7                    2.7.12-1ubuntu0~16.04.18+esm7
  libpython2.7-minimal      2.7.12-1ubuntu0~16.04.18+esm7
  libpython2.7-stdlib          2.7.12-1ubuntu0~16.04.18+esm7
  libpython3.5                    3.5.2-2ubuntu0~16.04.13+esm11
  libpython3.5-minimal      3.5.2-2ubuntu0~16.04.13+esm11
  libpython3.5-stdlib          3.5.2-2ubuntu0~16.04.13+esm11

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

References:
  https://ubuntu.com/security/notices/USN-6400-1
  CVE-2022-48566