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.
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Ubuntu Security Notice USN-4754-2
February 25, 2021
python2.7 regression
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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