GLSA 202003-45: PyYAML: Arbitrary code execution

http://security.gentoo.org/

Severity:	high
Title:	PyYAML: Arbitrary code execution
Date:	03/19/2020
Bugs:	#659348
ID:	202003-45

Synopsis

A flaw in PyYAML might allow attackers to execute arbitrary code.

Background

PyYAML is a YAML parser and emitter for Python.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
dev-python/pyyaml	< 5.1	>= 5.1	All supported architectures

Description

It was found that using yaml.load() API on untrusted input could lead to arbitrary code execution.

Impact

A remote attacker could entice a user to process specially crafted input in an application using yaml.load() from PyYAML, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

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-5.1"

References

CVE-2017-18342

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202003-45.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.