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AUSCERT External Security Bulletin Redistribution
ESB-2021.3271
USN-4973-2: Python vulnerability
5 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Python
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-29921
Reference: ESB-2021.2992
ESB-2021.2904
ESB-2021.1882
Original Bulletin:
https://ubuntu.com/security/notices/USN-4973-2
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USN-4973-2: Python vulnerability
04 October 2021
Python could allow unintended access to network services.
Releases
o Ubuntu 20.04 LTS
Packages
o python3.8 - An interactive high-level object-oriented language
Details
USN-4973-1 fixed this vulnerability previously, but it was re-introduced
in python3.8 in focal because of the SRU in LP: #1928057. This update fixes
the problem.
Original advisory details:
It was discovered that the Python stdlib ipaddress API incorrectly handled
octal strings. A remote attacker could possibly use this issue to perform a
wide variety of attacks, including bypassing certain access restrictions.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o python3.8-minimal - 3.8.10-0ubuntu1~20.04.1
o python3.8 - 3.8.10-0ubuntu1~20.04.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-29921
o https://launchpad.net/bugs/1945240
Related notices
o USN-4973-1 : libpython3.8-stdlib, libpython3.8, python3.8-minimal,
libpython3.8-minimal, python3.8, libpython3.8-dev, libpython3.8-testsuite,
python3.8-dev, idle-python3.8, python3.8-examples, python3.8-doc,
python3.8-venv
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