A Django security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 20.10, and 21.04.

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Ubuntu Security Notice USN-4975-1
June 02, 2021

python-django vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Django.

Software Description:
- python-django: High-level Python web development framework

Details:

It was discovered that the Django URLValidator function incorrectly handled
newlines and tabs. A remote attacker could possibly use this issue to
perform a header injection attack. This issue only affected Ubuntu 20.04
LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-32052)

Rasmus Lerchedahl Petersen and Rasmus Wriedt Larsen discovered that Django
incorrectly handled path sanitation in admindocs. A remote attacker could
possibly use this issue to determine the existence of arbitrary files and
in certain configurations obtain their contents. (CVE-2021-33203)

It was discovered that Django incorrectly handled IPv4 addresses with
leading zeros. A remote attacker could possibly use this issue to perform a
wide variety of attacks, including bypassing certain access restrictions.
(CVE-2021-33571)

Update instructions:

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

Ubuntu 21.04:
python3-django 2:2.2.20-1ubuntu0.2

Ubuntu 20.10:
python3-django 2:2.2.16-1ubuntu0.5

Ubuntu 20.04 LTS:
python3-django 2:2.2.12-1ubuntu0.7

Ubuntu 18.04 LTS:
python-django 1:1.11.11-1ubuntu1.14
python3-django 1:1.11.11-1ubuntu1.14

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

References:
  https://ubuntu.com/security/notices/USN-4975-1
CVE-2021-32052, CVE-2021-33203, CVE-2021-33571

Package Information:
  https://launchpad.net/ubuntu/+source/python-django/2:2.2.20-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/python-django/2:2.2.16-1ubuntu0.5
  https://launchpad.net/ubuntu/+source/python-django/2:2.2.12-1ubuntu0.7
  https://launchpad.net/ubuntu/+source/python-django/1:1.11.11-1ubuntu1.14