Out-of-bounds Write Affecting php:7.4/apcu-panel package, versions <0:5.1.18-1.module_el8.6.0+2750+78feabcb


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-ALMALINUX8-PHP-5609708
  • published28 May 2023
  • disclosed10 May 2022

Introduced: 10 May 2022

CVE-2021-21703  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 php:7.4/apcu-panel to version 0:5.1.18-1.module_el8.6.0+2750+78feabcb or higher.
This issue was patched in ALSA-2022:1935.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php:7.4/apcu-panel package and not the php:7.4/apcu-panel package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.

CVSS Scores

version 3.1