Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

USN-5199-1: Python vulnerabilities

17 December 2021

Python could be made to crash if it receives specially crafted input from a malicious server.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

  • python3.6 - An interactive high-level object-oriented language

Details

It was discovered that the urllib.request.AbstractBasicAuthHandler class
in Python contains regex with a quadratic worst-case time complexity.
Specially crafted traffic from a malicious HTTP server could cause a regular
expression denial of service (ReDoS) condition for a client.
(CVE-2021-3733)

It was discovered that the Python urllib http client could enter into an infinite
loop when incorrectly handling certain server responses (100 Continue response).
Specially crafted traffic from a malicious HTTP server could cause a denial of
service (DoS) condition for a client.
(CVE-2021-3737)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04

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

Related notices

  • USN-5083-1: python3.5, libpython3.5-testsuite, python3.4-venv, libpython3.4-testsuite, python3.5-dev, python3.5-minimal, libpython3.4, python3.5-venv, libpython3.5, libpython3.5-minimal, python3.4-examples, python3.5-examples, libpython3.4-minimal, idle-python3.5, python3.4-doc, python3.5-doc, libpython3.5-stdlib, libpython3.5-dev, python3.4-minimal, libpython3.4-dev, python3.4, idle-python3.4, python3.4-dev, libpython3.4-stdlib
  • USN-5200-1: libpython3.8-stdlib, python3.8-dev, libpython3.8-testsuite, python3.8-examples, libpython3.8-minimal, python3.7-minimal, idle-python3.8, libpython3.7-stdlib, python3.8-minimal, python3.7, libpython3.7-testsuite, libpython3.8-dev, python3.8, libpython3.7-minimal, libpython3.8, python3.7-doc, libpython3.7, python3.7-examples, python3.7-venv, libpython3.7-dev, python3.7-dev, python3.8-venv, idle-python3.7
  • USN-5201-1: libpython3.8-stdlib, python3.8-dev, libpython3.8-testsuite, python3.9-full, python3.8-examples, libpython3.8-minimal, idle-python3.9, python3.9-dev, idle-python3.8, libpython3.9-stdlib, python3.9, python3.8-doc, python3.8-minimal, python3.8-full, libpython3.8-dev, python3.8, libpython3.9-minimal, python3.9-minimal, libpython3.8, python3.9-doc, python3.9-examples, libpython3.9, python3.9-venv, python3.8-venv, libpython3.9-testsuite, libpython3.9-dev