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AUSCERT External Security Bulletin Redistribution
ESB-2021.1882
USN-4973-1: Python vulnerability
2 June 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Python
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-29921
Original Bulletin:
https://ubuntu.com/security/notices/USN-4973-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Python check for an updated version of the software for
their operating system.
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USN-4973-1: Python vulnerability
01 June 2021
Python could allow unintended access to network services.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o python3.8 - An interactive high-level object-oriented language
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 20.10
o python3.8-minimal - 3.8.6-1ubuntu0.3
o python3.8 - 3.8.6-1ubuntu0.3
Ubuntu 20.04
o python3.8-minimal - 3.8.5-1~20.04.3
o python3.8 - 3.8.5-1~20.04.3
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-29921
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