Use After Free Affecting php7-ftp package, versions <7.4.33-150400.4.13.1


Severity

Recommended
medium

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.44% (76th percentile)

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  • Snyk IDSNYK-SLES154-PHP7FTP-3123567
  • published17 Nov 2022
  • disclosed15 Nov 2022

Introduced: 15 Nov 2022

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

How to fix?

Upgrade SLES:15.4 php7-ftp to version 7.4.33-150400.4.13.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php7-ftp package and not the php7-ftp package as distributed by SLES. See How to fix? for SLES:15.4 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