SB2023122039 - Denial of service in Keycloak

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Main Vulnerability Database SB2023122039

SB2023122039 - Denial of service in Keycloak

Published: December 20, 2023

Security Bulletin ID SB2023122039
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Resource exhaustion (CVE-ID: CVE-2023-6563)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper control over internal resources in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). A remote user can create two or more user sessions and then open the "consents" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.


Remediation

Install update from vendor's website.

References