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AUSCERT External Security Bulletin Redistribution
ESB-2021.1580
USN-4940-1: PyYAML vulnerability
11 May 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: PyYAML
Publisher: Ubuntu
Operating System: Ubuntu
Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-14343
Original Bulletin:
https://ubuntu.com/security/notices/USN-4940-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running PyYAML check for an updated version of the software for
their operating system.
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USN-4940-1: PyYAML vulnerability
10 May 2021
PyYAML could be made to run programs if it opened a specially crafted YAML
file.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o pyyaml - YAML parser and emitter for Python
Details
It was discovered that PyYAML incorrectly handled untrusted YAML files with
the FullLoader loader. A remote attacker could possibly use this issue to
execute arbitrary code.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o python3-yaml - 5.3.1-2ubuntu0.1
Ubuntu 20.04
o python-yaml - 5.3.1-1ubuntu0.1
o python3-yaml - 5.3.1-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-14343
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