Python security updates has been released for Ubuntu Linux 19.10, 18.04 LTS, 16.04 LTS, 14.04 ESM, and 12.04 ESM.

USN-4333-1: Python vulnerabilities

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Ubuntu Security Notice USN-4333-1
April 21, 2020

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

- Ubuntu 19.10
- 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:
- python3.7: An interactive high-level object-oriented language
- 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 incorrectly stripped certain characters from
requests. A remote attacker could use this issue to perform CRLF injection.
(CVE-2019-18348)

It was discovered that Python incorrectly handled certain HTTP requests.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2020-8492)

Update instructions:

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

Ubuntu 19.10:
python3.7 3.7.5-2~19.10ubuntu1
python3.7-minimal 3.7.5-2~19.10ubuntu1

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

Ubuntu 16.04 LTS:
python2.7 2.7.12-1ubuntu0~16.04.11
python2.7-minimal 2.7.12-1ubuntu0~16.04.11
python3.5 3.5.2-2ubuntu0~16.04.10
python3.5-minimal 3.5.2-2ubuntu0~16.04.10

Ubuntu 14.04 ESM:
python2.7 2.7.6-8ubuntu0.6+esm5
python2.7-minimal 2.7.6-8ubuntu0.6+esm5
python3.4 3.4.3-1ubuntu1~14.04.7+esm6
python3.4-minimal 3.4.3-1ubuntu1~14.04.7+esm6

Ubuntu 12.04 ESM:
python2.7 2.7.3-0ubuntu3.17
python2.7-minimal 2.7.3-0ubuntu3.17

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

References:
  https://usn.ubuntu.com/4333-1
CVE-2019-18348, CVE-2020-8492

Package Information:
  https://launchpad.net/ubuntu/+source/python3.7/3.7.5-2~19.10ubuntu1
  https://launchpad.net/ubuntu/+source/python2.7/2.7.17-1~18.04ubuntu1
  https://launchpad.net/ubuntu/+source/python3.6/3.6.9-1~18.04ubuntu1
  https://launchpad.net/ubuntu/+source/python2.7/2.7.12-1ubuntu0~16.04.11
  https://launchpad.net/ubuntu/+source/python3.5/3.5.2-2ubuntu0~16.04.10