<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="202003-45"> <title>PyYAML: Arbitrary code execution</title> <synopsis>A flaw in PyYAML might allow attackers to execute arbitrary code.</synopsis> <product type="ebuild">pyyaml</product> <announced>2020-03-19</announced> <revised count="1">2020-03-19</revised> <bug>659348</bug> <access>local, remote</access> <affected> <package name="dev-python/pyyaml" auto="yes" arch="*"> <unaffected range="ge">5.1</unaffected> <vulnerable range="lt">5.1</vulnerable> </package> </affected> <background> <p>PyYAML is a YAML parser and emitter for Python.</p> </background> <description> <p>It was found that using yaml.load() API on untrusted input could lead to arbitrary code execution. </p> </description> <impact type="high"> <p>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. </p> </impact> <workaround> <p>There is no known workaround at this time.</p> </workaround> <resolution> <p>All PyYAML users should upgrade to the latest version:</p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=dev-python/pyyaml-5.1" </code> </resolution> <references> <uri link="https://nvd.nist.gov/vuln/detail/CVE-2017-18342">CVE-2017-18342</uri> </references> <metadata tag="requester" timestamp="2020-03-19T18:50:48Z">whissi</metadata> <metadata tag="submitter" timestamp="2020-03-19T18:55:38Z">whissi</metadata> </glsa>