Keycloak: offline session token dos
CVE-2023-6563

7.7HIGH

Key Information:

Vendor
Red Hat
Status
Red Hat Single Sign-on 7.6 For Rhel 7
Red Hat Single Sign-on 7.6 For Rhel 8
Red Hat Single Sign-on 7.6 For Rhel 9
Rhel-8 Based Middleware Containers
Vendor
CVE Published:
14 December 2023

Summary

An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (> 500,000 users with each having at least 2 saved sessions). If an attacker creates 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.

Affected Version(s)

Red Hat Single Sign-On 7.6 for RHEL 7 0:18.0.11-2.redhat_00003.1.el7sso

Red Hat Single Sign-On 7.6 for RHEL 8 0:18.0.11-2.redhat_00003.1.el8sso

Red Hat Single Sign-On 7.6 for RHEL 9 0:18.0.11-2.redhat_00003.1.el9sso

References

https://access.redhat.com/errata/RHSA-2023:7854
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7855
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2023:7856
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre Database
.