A Python security update has been released for Ubuntu Linux 20.04 LTS, 18.04 LTS, 16.04 LTS, 14.04 ESM, and 12.04 ESM.

USN-4428-1: Python vulnerabilities

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Ubuntu Security Notice USN-4428-1
July 22, 2020

python2.7, python3.4, python3.5, python3.6, python3.8 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Python.

Software Description:
- python3.8: Interactive high-level object-oriented language (version 3.8)
- python2.7: An interactive high-level object-oriented language
- python3.6: An interactive high-level object-oriented language
- python3.5: An interactive high-level object-oriented language
- python3.4: An interactive high-level object-oriented language

Details:

It was discovered that Python documentation had a misleading information.
A security issue could be possibly caused by wrong assumptions of this information.
This issue only affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and
Ubuntu 18.04 LTS. (CVE-2019-17514)

It was discovered that Python incorrectly handled certain TAR archives.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2019-20907)

It was discovered that incorrectly handled certain ZIP files. An attacker
could possibly use this issue to cause a denial of service. This issue only
affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
(CVE-2019-9674)

It was discovered that Python incorrectly handled certain IP values.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-14422)

Update instructions:

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

Ubuntu 20.04 LTS:
python3.8 3.8.2-1ubuntu1.2
python3.8-minimal 3.8.2-1ubuntu1.2

Ubuntu 18.04 LTS:
python2.7 2.7.17-1~18.04ubuntu1.1
python2.7-minimal 2.7.17-1~18.04ubuntu1.1
python3.6 3.6.9-1~18.04ubuntu1.1
python3.6-minimal 3.6.9-1~18.04ubuntu1.1

Ubuntu 16.04 LTS:
python2.7 2.7.12-1ubuntu0~16.04.12
python2.7-minimal 2.7.12-1ubuntu0~16.04.12
python3.5 3.5.2-2ubuntu0~16.04.11
python3.5-minimal 3.5.2-2ubuntu0~16.04.11

Ubuntu 14.04 ESM:
python2.7 2.7.6-8ubuntu0.6+esm6
python2.7-minimal 2.7.6-8ubuntu0.6+esm6
python3.4 3.4.3-1ubuntu1~14.04.7+esm7
python3.4-minimal 3.4.3-1ubuntu1~14.04.7+esm7

Ubuntu 12.04 ESM:
python2.7 2.7.3-0ubuntu3.18
python2.7-minimal 2.7.3-0ubuntu3.18

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

References:
  https://usn.ubuntu.com/4428-1
CVE-2019-17514, CVE-2019-20907, CVE-2019-9674, CVE-2020-14422

Package Information:
  https://launchpad.net/ubuntu/+source/python3.8/3.8.2-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/python2.7/2.7.17-1~18.04ubuntu1.1
  https://launchpad.net/ubuntu/+source/python3.6/3.6.9-1~18.04ubuntu1.1
  https://launchpad.net/ubuntu/+source/python2.7/2.7.12-1ubuntu0~16.04.12
  https://launchpad.net/ubuntu/+source/python3.5/3.5.2-2ubuntu0~16.04.11