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AUSCERT External Security Bulletin Redistribution
ESB-2021.3138
USN-5083-1: Python vulnerabilities
17 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Python
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3737 CVE-2021-3733
Original Bulletin:
https://ubuntu.com/security/notices/USN-5083-1
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-5083-1: Python vulnerabilities
16 September 2021
Several security issues were fixed in Python.
Releases
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o python3.4 - An interactive high-level object-oriented language
o python3.5 - An interactive high-level object-oriented language
Details
It was discovered that Python incorrectly handled certain RFCs.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 16.04 ESM. ( CVE-2021-3733 )
It was discovered that Python incorrectly handled certain
server responses. An attacker could possibly use this issue to
cause a denial of service. ( CVE-2021-3737 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o python3.5 - 3.5.2-2ubuntu0~16.04.13+esm1
Available with UA Infra or UA Desktop
o python3.5-minimal - 3.5.2-2ubuntu0~16.04.13+esm1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o python3.4-minimal - 3.4.3-1ubuntu1~14.04.7+esm11
Available with UA Infra or UA Desktop
o python3.4 - 3.4.3-1ubuntu1~14.04.7+esm11
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3733
o CVE-2021-3737
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