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Use After Free Affecting php-common package, versions <0:8.0.20-3.el9

medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.28% (68th percentile)
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NVD
9.8 critical
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SUSE
7 high
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Red Hat
9.8 critical

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  • Snyk ID SNYK-CENTOS9-PHPCOMMON-2879653
  • published 18 Feb 2022
  • disclosed 17 Feb 2022
Report a new vulnerability Found a mistake?

Introduced: 17 Feb 2022

CVE-2021-21708 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade Centos:9 php-common to version 0:8.0.20-3.el9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-common package and not the php-common package as distributed by Centos. See How to fix? for Centos:9 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.