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Ubuntu Security Notice USN-4754-4

Ubuntu Security Notice USN-4754-4
Posted Mar 3, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4754-4 - USN-4754-1 fixed vulnerabilities in Python. Because of a regression, a subsequent update removed the fix for CVE-2021-3177. This update reinstates the security fix for CVE-2021-3177. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, vulnerability, python
systems | linux, ubuntu
advisories | CVE-2021-3177
MD5 | 6c6bc4e280c087eaec3deb827504f9bd

Ubuntu Security Notice USN-4754-4

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4754-4
March 03, 2021

python2.7 vulnerability
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Python could be made to execute arbitrary code or denial of service if it
received a specially crafted input.

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

Details:

USN-4754-1 fixed vulnerabilities in Python. Because of a regression, a
subsequent update removed the fix for CVE-2021-3177. This update reinstates
the security fix for CVE-2021-3177.

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 2.7.17-1~18.04ubuntu1.6
python2.7-minimal 2.7.17-1~18.04ubuntu1.6

Ubuntu 16.04 LTS:
python2.7 2.7.12-1ubuntu0~16.04.18
python2.7-minimal 2.7.12-1ubuntu0~16.04.18

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

References:
https://usn.ubuntu.com/4754-4
https://usn.ubuntu.com/4754-1
CVE-2021-3177

Package Information:
https://launchpad.net/ubuntu/+source/python2.7/2.7.17-1~18.04ubuntu1.6
https://launchpad.net/ubuntu/+source/python2.7/2.7.12-1ubuntu0~16.04.18

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