Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-21703

PHP-FPM memory access in root process leading to privilege escalation

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
php

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

PHP Group PHP

  • 7.3.x to ≤ 7.3.31affected
  • 7.4.x to < 7.4.25affected
  • 8.0.X to < 8.0.12affected

References