CVE-2021-21703
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Php
PublishedOct 25, 2021
First seenOct 25, 2021
How to fix
Update
- php php7.4.25, 8.0.12 or later
Vendor advisories
- debian.org/security/2021/dsa-4992
- debian.org/security/2021/dsa-4993
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/
- security.gentoo.org/glsa/202209-20
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| php php | 7.3.0 ≤ v ≤ 7.3.31, 7.4.0 ≤ v < 7.4.25, 8.0.0 ≤ v < 8.0.12 | 7.4.25, 8.0.12 |
| debian debian_linux | 9.0, 10.0, 11.0 | — |
| fedoraproject fedora | 33, 34, 35 | — |
| netapp clustered_data_ontap | No range specified | — |
| oracle communications_diameter_signaling_router | 8.0.0.0 ≤ v ≤ 8.5.0.2 | — |
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