// For flags

CVE-2021-27927

openSUSE Security Advisory - openSUSE-SU-2022:0036-1

Severity Score

8.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

En Zabbix desde las versiones 4.0.x anteriores a 4.0.28rc1, versiones 5.0.0alpha1 anteriores a 5.0.10rc1, versiones 5.2.x anteriores a 5.2.6rc1, y versiones 5.4.0alpha1 anteriores a 5.4.0beta2, el controlador CControllerAuthenticationUpdate carece de un mecanismo de protección CSRF. El código dentro de este controlador llama a diableSIDValidation dentro del método init(). Un atacante no tiene que conocer las credenciales de inicio de sesión del usuario de Zabbix, pero tiene que conocer la URL correcta de Zabbix y la información de contacto de un usuario existente con suficientes privilegios

An update that solves three vulnerabilities and has two fixes is now available. This update for zabbix fixes the following issues. Fixed possible view of the setup pages by unauthenticated users if config file already exists. Fixed CSRF protection mechanism inside CControllerAuthenticationUpdate controller. Fixed stored XSS in the URL Widget.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-03 CVE Reserved
  • 2021-03-03 CVE Published
  • 2024-08-03 CVE Updated
  • 2025-07-16 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-352: Cross-Site Request Forgery (CSRF)
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Zabbix
Search vendor "Zabbix"
 Zabbix
Search vendor "Zabbix" for product "Zabbix"
 >= 4.0.0 <= 4.0.27
Search vendor "Zabbix" for product "Zabbix" and version " >= 4.0.0 <= 4.0.27"
-
Affected
Zabbix
Search vendor "Zabbix"
 Zabbix
Search vendor "Zabbix" for product "Zabbix"
 >= 5.0.0 <= 5.0.9
Search vendor "Zabbix" for product "Zabbix" and version " >= 5.0.0 <= 5.0.9"
-
Affected
Zabbix
Search vendor "Zabbix"
 Zabbix
Search vendor "Zabbix" for product "Zabbix"
 >= 5.2.0 <= 5.2.3
Search vendor "Zabbix" for product "Zabbix" and version " >= 5.2.0 <= 5.2.3"
-
Affected