Vulnerability Details : CVE-2021-27927
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.
Vulnerability category: Cross-site request forgery (CSRF)
Products affected by CVE-2021-27927
- cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
- cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
- cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27927
0.16%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 38 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27927
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST |
CWE ids for CVE-2021-27927
-
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-27927
-
https://support.zabbix.com/browse/ZBX-18942
[ZBX-18942] CControllerAuthenticationUpdate controller is not protected by a CSRF token - ZABBIX SUPPORTIssue Tracking;Patch;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2023/04/msg00013.html
[SECURITY] [DLA 3390-1] zabbix security update
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