<p>Upgrade <code>Amazon-Linux:2</code> <code>expat</code> to version 0:2.1.0-12.amzn2 or higher.<br>This issue was patched in <code>ALAS2-2020-1513</code>.</p>

XML External Entity (XXE) Injection Affecting expat package, versions <0:2.1.0-12.amzn2

Snyk CVSS

Attack Complexity Low

Availability High

Threat Intelligence

EPSS 60.91% (98^th percentile)

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Snyk ID SNYK-AMZN2-EXPAT-1686307
published 27 Sep 2021
disclosed 24 Jun 2019

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Introduced: 24 Jun 2019

CVE-2018-20843 Open this link in a new tab CWE-611 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2 expat to version 0:2.1.0-12.amzn2 or higher.
This issue was patched in ALAS2-2020-1513.

NVD Description

Note: Versions mentioned in the description apply only to the upstream expat package and not the expat package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).