USN-4975-2: Django vulnerability

USN-4975-2: Django vulnerability

USN-4975-1 fixed a vulnerability in Django. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

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)
Source: USN-4975-2: Django vulnerability