A Python security update has been released for Ubuntu 20.04 LTS and 21.04.
==========================================================================
Ubuntu Security Notice USN-5201-1
December 17, 2021
python3.8, python3.9 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
Summary:
Python could be made to crash if it receives specially crafted input
from a malicious server.
Software Description:
- python3.9: Interactive high-level object-oriented language (version 3.9)
- python3.8: An interactive high-level object-oriented language
Details:
It was discovered that the Python urllib http client could enter into an
infinite loop when incorrectly handling certain server responses (100
Continue response). Specially crafted traffic from a malicious HTTP
server could cause a denial of service (Dos) condition for a client.
(CVE-2021-3737)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
libpython3.9-stdlib 3.9.5-3ubuntu0~21.04.1
python3.9 3.9.5-3ubuntu0~21.04.1
python3.9-minimal 3.9.5-3ubuntu0~21.04.1
Ubuntu 20.04 LTS:
libpython3.8-stdlib 3.8.10-0ubuntu1~20.04.2
libpython3.9-stdlib 3.9.5-3ubuntu0~20.04.1
python3.8 3.8.10-0ubuntu1~20.04.2
python3.8-minimal 3.8.10-0ubuntu1~20.04.2
python3.9 3.9.5-3ubuntu0~20.04.1
python3.9-minimal 3.9.5-3ubuntu0~20.04.1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5201-1
CVE-2021-3737
Package Information:
https://launchpad.net/ubuntu/+source/python3.9/3.9.5-3ubuntu0~21.04.1
https://launchpad.net/ubuntu/+source/python3.8/3.8.10-0ubuntu1~20.04.2
https://launchpad.net/ubuntu/+source/python3.9/3.9.5-3ubuntu0~20.04.1
--MOCWJZiYksjQ1NDz0JoabnpnoAkq0u2CL--
--fRl3gAVFC3p355J03Ese3YjppgARI1Wsn
