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.
References
History
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MITRE Information
Status: PUBLISHED
Assigner: php
Published: 2021-10-18T00:00:00
Updated: 2022-09-29T16:06:50
Reserved: 2021-01-04T00:00:00
Link: CVE-2021-21703
JSON object: View
NVD Information
Status : Modified
Published: 2021-10-25T06:15:06.563
Modified: 2023-11-07T03:30:04.983
Link: CVE-2021-21703
JSON object: View
Redhat Information
No data.