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Gentoo: GLSA-202003-45 High Severity: PyYAML Arbitrary Code Execution

gentoo
Calendar Grey March 19, 2020
Dist Gentoo Esm H88
Gentoo Security Advisory GLSA 202103-47 identifies a critical vulnerability in urllib3 that permits remote code execution.
A flaw in PyYAML might allow attackers to execute arbitrary code.

Summary

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

Topics%20covered

Topics Covered

security advisory Gentoo high severity arbitrary code execution arbitrary code PyYAML

Resolution

All PyYAML users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-python/pyyaml-5.1"

References

[ 1 ] CVE-2017-18342 https://nvd.nist.gov/vuln/detail/CVE-2017-18342

Availability

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

Severity: High
Title: PyYAML: Arbitrary code execution
Date: March 19, 2020
Bugs: #659348
ID: 202003-45

Topics%20covered

Topics Covered

security advisory Gentoo high severity arbitrary code execution arbitrary code PyYAML

Synopsis

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

Background

PyYAML is a YAML parser and emitter for Python.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-python/pyyaml < 5.1 >= 5.1

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.

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