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CVE-2022-23131

Zabbix — Zabbix Frontend Authentication Bypass Vulnerability

Zabbix · CWE-290 · in CISA KEV since 2022-02-22

ExigentKEV since 2022 · listed over a yearCISA KEVActively Exploited
86

EVRS 86 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 340 of 2,960 tracked

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Why it scores 86

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.957.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

zabbix: update to a version newer than 5.4.8

Affected versions

  • zabbix>= 5.4.0 <= 5.4.86.0.0

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.957 (99.87th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-03-08 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.1 (v3.1), assigned by Zabbix. Listed ENISA EUVD

Description

NVD

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).

What CISA says to do