[ GLSA 202003-45 ] PyYAML

[GLSA]

Gentoo Linux Security Advisory

Title: PyYAML: Arbitrary code execution (GLSA 202003-45)
Severity: high
Exploitable: local, remote
Date: 2020-03-19
Bug(s): #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: dev-python/pyyaml
Vulnerable: < 5.1
Unaffected: >= 5.1
Architectures: 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: