CVE-2021-21703

CVE Details

Release Date:	2021-10-25
Impact:	None	What is this?

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.

See more information about CVE-2021-21703 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.0
Vector String:	CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	High
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (libzip)	ELSA-2022-1935	2022-05-17
Oracle Linux version 8 (php)	ELSA-2022-1935	2022-05-17
Oracle Linux version 8 (php-pear)	ELSA-2022-1935	2022-05-17
Oracle Linux version 8 (php-pecl-apcu)	ELSA-2022-1935	2022-05-17
Oracle Linux version 8 (php-pecl-rrd)	ELSA-2022-1935	2022-05-17
Oracle Linux version 8 (php-pecl-xdebug)	ELSA-2022-1935	2022-05-17
Oracle Linux version 8 (php-pecl-zip)	ELSA-2022-1935	2022-05-17