[USN-4973-2] Python vulnerability

Leonidas S. Barbosa leo.barbosa at canonical.com
Mon Oct 4 14:55:16 UTC 2021

Ubuntu Security Notice USN-4973-2
October 04, 2021

python3.8 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS


Python could allow unintended access to network services.

Software Description:
- python3.8: An interactive high-level object-oriented language


USN-4973-1 fixed this vulnerability previously, but it was re-introduced
in python3.8 in focal because of the SRU in LP: #1928057. This update fixes
the problem.

Original advisory details:

 It was discovered that the Python stdlib ipaddress API incorrectly handled
 octal strings. A remote attacker could possibly use this issue to perform a
 wide variety of attacks, including bypassing certain access restrictions.

Update instructions:

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

Ubuntu 20.04 LTS:
  python3.8                       3.8.10-0ubuntu1~20.04.1
  python3.8-minimal               3.8.10-0ubuntu1~20.04.1

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

  CVE-2021-29921, https://launchpad.net/bugs/1945240

Package Information:
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