Incorrect Calculation Affecting expat-static package, versions <0:2.1.0-12.amzn2.0.4


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.4% (74th percentile)

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  • Snyk IDSNYK-AMZN2-EXPATSTATIC-2805075
  • published28 Apr 2022
  • disclosed1 Jan 2022

Introduced: 1 Jan 2022

CVE-2021-45960  (opens in a new tab)
CWE-682  (opens in a new tab)
CWE-130  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 expat-static to version 0:2.1.0-12.amzn2.0.4 or higher.
This issue was patched in ALAS2-2022-1788.

NVD Description

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

In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).

CVSS Scores

version 3.1