Use After Free Affecting php-json package, versions <0:7.4.30-1.module+el8.7.0+1067+0a7071cc


Severity

Recommended
medium

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.44% (76th percentile)

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  • Snyk IDSNYK-ROCKY8-PHPJSON-3271092
  • published5 Jan 2023
  • disclosed27 Feb 2022

Introduced: 27 Feb 2022

CVE-2021-21708  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 php-json to version 0:7.4.30-1.module+el8.7.0+1067+0a7071cc or higher.
This issue was patched in RLSA-2022:7628.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-json package and not the php-json package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.

CVSS Scores

version 3.1