Incorrect Calculation Affecting expat package, versions <2.4.3-r0


Severity

Recommended
0.0
high
0
10

Snyk's Security Team recommends NVD's CVSS assessment

    Threat Intelligence

    EPSS
    1.02% (85th percentile)

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  • Snyk ID SNYK-ALPINE316-EXPAT-2842192
  • published 17 Jan 2022
  • disclosed 1 Jan 2022

How to fix?

Upgrade Alpine:3.16 expat to version 2.4.3-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream expat package and not the expat package as distributed by Alpine. See How to fix? for Alpine:3.16 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

Recommended
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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SUSE

6.4 medium
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Red Hat

8.8 high