Saturday, December 18, 2021

Ubuntu Security Notice USN-5201-1

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Ubuntu Security Notice USN-5201-1
December 17, 2021

python3.8, python3.9 vulnerabilities
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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
 

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