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Incorrect Calculation Affecting expat package, versions <0:2.1.0-12.28.amzn1

medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 1.02% (84th percentile)
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NVD
8.8 high
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SUSE
6.4 medium
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Red Hat
8.8 high

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  • Snyk ID SNYK-AMZN201803-EXPAT-2866166
  • published 10 Jun 2022
  • disclosed 1 Jan 2022
Report a new vulnerability Found a mistake?

Introduced: 1 Jan 2022

CVE-2021-45960 Open this link in a new tab
CWE-682 Open this link in a new tab
CWE-130 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2018.03 expat to version 0:2.1.0-12.28.amzn1 or higher.
This issue was patched in ALAS-2022-1588.

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:2018.03 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).