==========================================================================
Ubuntu Security Notice USN-4940-1
May 10, 2021
pyyaml vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
Summary:
PyYAML could be made to run programs if it opened a specially crafted YAML
file.
Software Description:
- 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:
python3-yaml 5.3.1-2ubuntu0.1
Ubuntu 20.04 LTS:
python-yaml 5.3.1-1ubuntu0.1
python3-yaml 5.3.1-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4940-1
CVE-2020-14343
Package Information:
https://launchpad.net/ubuntu/+source/pyyaml/5.3.1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/pyyaml/5.3.1-1ubuntu0.1
