#VU84615 Resource exhaustion in Keycloak - CVE-2023-6563
Published: December 20, 2023
Vulnerability identifier: #VU84615
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-6563
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Keycloak
Keycloak
Software vendor:
Keycloak
Keycloak
Description
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 updates from vendor's website.
External links
- https://access.redhat.com/security/cve/CVE-2023-6563
- https://bugzilla.redhat.com/show_bug.cgi?id=2253308
- https://github.com/keycloak/keycloak/issues/13340
- https://access.redhat.com/errata/RHSA-2023:7854
- https://access.redhat.com/errata/RHSA-2023:7855
- https://access.redhat.com/errata/RHSA-2023:7856
- https://access.redhat.com/errata/RHSA-2023:7857
- https://access.redhat.com/errata/RHSA-2023:7858