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Ubuntu Security Notice USN-4754-2

Ubuntu Security Notice USN-4754-2
Posted Feb 26, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4754-2 - USN-4754-1 fixed a vulnerability in Python. The fix for CVE-2021-3177 introduced a regression in Python 2.7. This update reverts the security fix pending further investigation. It was discovered that Python incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service.

tags | advisory, denial of service, arbitrary, python
systems | linux, ubuntu
MD5 | c58459cb7018d68bd66024f925f30d8f

Ubuntu Security Notice USN-4754-2

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4754-2
February 25, 2021

python2.7 regression
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM

Summary:

USN-4754-1 introduced a regression in Python2.7.

Software Description:
- python2.7: An interactive high-level object-oriented language

Details:

USN-4754-1 fixed a vulnerability in Python. The fix for CVE-2021-3177 introduced a
regression in Python 2.7. This update reverts the security fix pending further investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Python incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code
or cause a denial of service. (CVE-2020-27619, CVE-2021-3177)

Update instructions:

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

Ubuntu 18.04 LTS:
python2.7 2.7.17-1~18.04ubuntu1.5
python2.7-minimal 2.7.17-1~18.04ubuntu1.5

Ubuntu 16.04 LTS:
python2.7 2.7.12-1ubuntu0~16.04.16
python2.7-minimal 2.7.12-1ubuntu0~16.04.16

Ubuntu 14.04 ESM:
python2.7 2.7.6-8ubuntu0.6+esm9
python2.7-minimal 2.7.6-8ubuntu0.6+esm9

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

References:
https://usn.ubuntu.com/4754-2
https://usn.ubuntu.com/4754-1
https://launchpad.net/bugs/1916893

Package Information:
https://launchpad.net/ubuntu/+source/python2.7/2.7.17-1~18.04ubuntu1.5
https://launchpad.net/ubuntu/+source/python2.7/2.7.12-1ubuntu0~16.04.16
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