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


Severity

Recommended
medium

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    1.02% (85th percentile)

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  • Snyk ID SNYK-AMZN2-EXPAT-2805159
  • published 28 Apr 2022
  • disclosed 1 Jan 2022

How to fix?

Upgrade Amazon-Linux:2 expat 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 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 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
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NVD

8.8 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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Red Hat

8.8 high
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SUSE

6.4 medium