cyfenced.com →

[ CVE-2022-23131 · Published 13 Jan 2022 ]

Zabbix Frontend Authentication Bypass Vulnerability

Exploited · CISA KEV CVSS 9.8 EPSS 96%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-02-22
  • EPSS: 96% chance of exploitation in the next 30 days (higher than 100% of CVEs)
  • Critical severity: CVSS 9.8

[ Description ]Official description

In the case of instances where the SAML SSO authentication is enabled (non-default), session data can be modified by a malicious actor, because a user login stored in the session was not verified. Malicious unauthenticated actor may exploit this issue to escalate privileges and gain admin access to Zabbix Frontend. To perform the attack, SAML authentication is required to be enabled and the actor has to know the username of Zabbix user (or use the guest account, which is disabled by default).

CISA: Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 8 Mar 2022): Apply updates per vendor instructions.

[ References ]References