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Ubuntu Security Notice USN-5767-2
December 08, 2022

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Python could be made to denial of service if it received
a specially crafted IDNA input.

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

Details:

USN-5767-1 fixed a vulnerability in Python. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

 It was discovered that Python incorrectly handled certain IDNA inputs.
 An attacker could possibly use this issue to expose sensitive information
 denial of service, or cause a crash.
 (CVE-2022-45061)

Update instructions:

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

Ubuntu 16.04 ESM:
  libpython2.7                    2.7.12-1ubuntu0~16.04.18+esm3
  libpython3.5                    3.5.2-2ubuntu0~16.04.13+esm6
  python2.7                       2.7.12-1ubuntu0~16.04.18+esm3
  python3.5                       3.5.2-2ubuntu0~16.04.13+esm6

Ubuntu 14.04 ESM:
  libpython2.7                    2.7.6-8ubuntu0.6+esm13
  python2.7                       2.7.6-8ubuntu0.6+esm13

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

References:
  https://ubuntu.com/security/notices/USN-5767-2
  https://ubuntu.com/security/notices/USN-5767-1
  CVE-2022-45061