Resource exhaustion in Red Hat Build Of Keycloak
CVE-2023-6563
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (69.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Red Hat Build Of Keycloak
- Red Hat Single Sign-On 7.6 For Rhel 7 — versions 0:18.0.11-2.redhat_00003.1.el7sso
- Red Hat Single Sign-On 7.6 For Rhel 8 — versions 0:18.0.11-2.redhat_00003.1.el8sso
- Red Hat Single Sign-On 7.6 For Rhel 9 — versions 0:18.0.11-2.redhat_00003.1.el9sso
- Red Hat Rhel-8 Based Middleware Containers — versions 7.6-38, 7.6.6-2
- Red Hat Single Sign-On 7.6.6
- Red Hat Enterprise Linux — versions 7.0, 8.0, 9.0
- Red Hat Keycloak
- Red Hat Openshift Container Platform — versions 4.11, 4.12
- Red Hat Openshift Container Platform For IBM Linuxone — versions 4.9, 4.10
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2023:7854 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2023:7855 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2023:7856 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2023:7857 (Exploit, vendor-advisory)
- access.redhat.com/errata/RHSA-2023:7858 (vendor-advisory, Vendor Advisory)
- access.redhat.com/security/cve/CVE-2023-6563 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking)
- github.com/keycloak/keycloak/issues/13340 (Issue Tracking)
Frequently asked questions
- What is CVE-2023-6563?
- CVE-2023-6563 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.7/10. Published 2023-12-14.
- How severe is CVE-2023-6563?
- High severity. CVSS v3 base score is 7.7 out of 10.