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Vulnerability Details : CVE-2021-21703

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.
Publish Date : 2021-10-25 Last Update Date : 2022-10-29
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- CVSS Scores & Vulnerability Types

CVSS Score
6.9
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 787

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2022:1935: php:7.4 security update (Moderate) oval:com.redhat.rhsa:def:20221935 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-21703

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
4 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
5 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
6 OS Fedoraproject Fedora 35 * * * Version Details Vulnerabilities
7 Application Netapp Clustered Data Ontap - * * * Version Details Vulnerabilities
8 Application Oracle Communications Diameter Signaling Router * * * * Version Details Vulnerabilities
9 Application PHP PHP * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 3
Fedoraproject Fedora 3
Netapp Clustered Data Ontap 1
Oracle Communications Diameter Signaling Router 1
PHP PHP 1

- References For CVE-2021-21703

https://www.debian.org/security/2021/dsa-4993
DEBIAN DSA-4993
https://security.gentoo.org/glsa/202209-20
GENTOO GLSA-202209-20
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.netapp.com/advisory/ntap-20211118-0003/ CONFIRM
https://lists.fedoraproject.org/archives/list/[email protected]/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/
FEDORA FEDORA-2021-9f68f5f752
https://bugs.php.net/bug.php?id=81026
https://lists.fedoraproject.org/archives/list/[email protected]/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/
FEDORA FEDORA-2021-02d218c3be
http://www.openwall.com/lists/oss-security/2021/10/26/7
MLIST [oss-security] 20211026 CVE-2021-21703: PHP-FPM 5.3.7 <= 8.0.12 Local Root
https://lists.fedoraproject.org/archives/list/[email protected]/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/
FEDORA FEDORA-2021-4140b54de2
https://lists.debian.org/debian-lts-announce/2021/10/msg00021.html
MLIST [debian-lts-announce] 20211027 [SECURITY] [DLA 2794-1] php7.0 security update
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.debian.org/security/2021/dsa-4992
DEBIAN DSA-4992

- Metasploit Modules Related To CVE-2021-21703

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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