GLSA 202402-33: PyYAML: Arbitrary Code Execution

http://security.gentoo.org/

Severity:	normal
Title:	PyYAML: Arbitrary Code Execution
Date:	02/26/2024
Bugs:	#766228
ID:	202402-33

Synopsis

A vulnerability has been found in PyYAML which can lead to arbitrary code execution.

Background

PyYAML is a YAML parser and emitter for Python.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-python/pyyaml	< 5.4	>= 5.4	All supported architectures

Description

A vulnerability has been discovered in PyYAML. Please review the CVE identifier referenced below for details.

Impact

A vulnerability was discovered in the PyYAML library, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

Workaround

There is no known workaround at this time.

Resolution

All PyYAML users should upgrade to the latest version:

          # emerge --sync
          # emerge --ask --oneshot --verbose ">=dev-python/pyyaml-5.4"

References

CVE-2020-14343

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202402-33.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.