Out-of-Bounds Affecting php-gd package, versions <0:7.4.19-2.module+el8.6.0+13953+0a59ce9f
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Test your applications- Snyk ID SNYK-CENTOS8-PHPGD-1958606
- published 22 Oct 2021
- disclosed 20 Oct 2021
Introduced: 20 Oct 2021
CVE-2021-21703 Open this link in a new tabHow to fix?
Upgrade Centos:8 php-gd to version 0:7.4.19-2.module+el8.6.0+13953+0a59ce9f or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream php-gd package and not the php-gd package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
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
- https://access.redhat.com/security/cve/CVE-2021-21703
- https://www.debian.org/security/2021/dsa-4992
- https://www.debian.org/security/2021/dsa-4993
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/
- https://bugs.php.net/bug.php?id=81026
- https://lists.debian.org/debian-lts-announce/2021/10/msg00021.html
- http://www.openwall.com/lists/oss-security/2021/10/26/7
- https://access.redhat.com/errata/RHSA-2022:1935
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/
- https://security.netapp.com/advisory/ntap-20211118-0003/
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://security.gentoo.org/glsa/202209-20
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/