Vulnerability · Published Mar 3, 2021 · Assigned by mitre
CVE-2021-27927
High 8.8
In plain English
A high-severity security flaw in the zabbix package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
In Zabbix from 4.0.x before 4.0.28rc1, 5.0.0alpha1 before 5.0.10rc1, 5.2.x before 5.2.6rc1, and 5.4.0alpha1 before 5.4.0beta2, the CControllerAuthenticationUpdate controller lacks a CSRF protection mechanism. The code inside this controller calls diableSIDValidation inside the init() method. An attacker doesn't have to know Zabbix user login credentials, but has to know the correct Zabbix URL and contact information of an existing user with sufficient privileges.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | zabbix | 5.2.6-r0 | ALPINE-CVE-2021-27927 |
| Alpine:v3.21 | zabbix | 5.2.6-r0 | ALPINE-CVE-2021-27927 |
| Alpine:v3.22 | zabbix | 5.2.6-r0 | ALPINE-CVE-2021-27927 |
| Alpine:v3.23 | zabbix | 5.2.6-r0 | ALPINE-CVE-2021-27927 |
| Alpine:v3.24 | zabbix | 5.2.6-r0 | ALPINE-CVE-2021-27927 |
| Debian:12 | zabbix | 1:5.0.8+dfsg-1 | DEBIAN-CVE-2021-27927 |
| Debian:13 | zabbix | 1:5.0.8+dfsg-1 | DEBIAN-CVE-2021-27927 |
| Debian:14 | zabbix | 1:5.0.8+dfsg-1 | DEBIAN-CVE-2021-27927 |