CVE-2021-21703

CVE Details

Release Date:

2021-10-25

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

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	7	Base Metrics:	AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Access Vector:	Local network	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

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team