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AUSCERT External Security Bulletin Redistribution
USN-4973-2: Python vulnerability
5 October 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2021-29921
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USN-4973-2: Python vulnerability
04 October 2021
Python could allow unintended access to network services.
o Ubuntu 20.04 LTS
o python3.8 - An interactive high-level object-oriented language
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
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.
The problem can be corrected by updating your system to the following package
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.
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,
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