CVE-2023-6563
An unconstrained memory consumption vulnerability was discovered in Keycloak.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.7 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- EPSS
- 1.24% probability · 67th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- redhat/keycloak · redhat/single sign-on · redhat/openshift container platform · redhat/openshift container platform for power · redhat/openshift container platform for ibm linuxone
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2023:7854Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:7855Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:7856Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:7857Exploit
- https://access.redhat.com/errata/RHSA-2023:7858Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2023-6563Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2253308Issue Tracking
- https://github.com/keycloak/keycloak/issues/13340Issue Tracking
- https://access.redhat.com/errata/RHSA-2023:7854Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:7855Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:7856Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:7857Exploit
- https://access.redhat.com/errata/RHSA-2023:7858Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2023-6563Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2253308Issue Tracking
- https://github.com/keycloak/keycloak/issues/13340Issue Tracking
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.