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


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
70.35% (99th percentile)

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  • Snyk IDSNYK-AMZN2-EXPATDEBUGINFO-1686528
  • published27 Sept 2021
  • disclosed24 Jun 2019

Introduced: 24 Jun 2019

CVE-2018-20843  (opens in a new tab)
CWE-611  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 expat-debuginfo 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-debuginfo package and not the expat-debuginfo 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).

References

CVSS Scores

version 3.1