Actively exploited · Published Jan 13, 2022 · Assigned by Zabbix
CVE-2022-23131Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML
Critical 9.1 Exploited
In plain English
A critical-severity authentication bypass by spoofing in Frontend from Zabbix. Attackers are actively exploiting it in the wild (listed by CISA on February 22, 2022). The chance it is exploited in the next 30 days is estimated at 95.7% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Mar 8, 2022.
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).
Affected products (as reported)
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://support.zabbix.com/browse/ZBX-20350 x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-23131 government-resource