CVE-2021-4133
First published: Thu Dec 16 2021(Updated: )
A flaw was found in Keycloak in versions from 12.0.0 and before 15.1.1 which allows an attacker with any existing user account to create new default user accounts via the administrative REST API even when new user registration is disabled.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Redhat Keycloak | >=12.0.0<15.1.1 | |
| redhat/rh-sso7-keycloak | <0:15.0.2-3.redhat_00002.1.el7 | 0:15.0.2-3.redhat_00002.1.el7 |
| redhat/rh-sso7-keycloak | <0:15.0.4-1.redhat_00001.1.el7 | 0:15.0.4-1.redhat_00001.1.el7 |
| redhat/rh-sso7-keycloak | <0:15.0.2-3.redhat_00002.1.el8 | 0:15.0.2-3.redhat_00002.1.el8 |
| redhat/rh-sso7-keycloak | <0:15.0.4-1.redhat_00001.1.el8 | 0:15.0.4-1.redhat_00001.1.el8 |
| redhat/redhat-sso | <7-sso75-openshift-rhel8 | 7-sso75-openshift-rhel8 |
Remedy
Access to the user-creation functionality in the REST endpoint can be deactivated using CLI commands in undertow. run: bin/jboss-cli.sh --connect /subsystem=undertow/configuration=filter/expression-filter=keycloakPathOverrideUsersCreateEndpoint:add( \ expression="(regex('^/auth/admin/realms/(.*)/users$') and method(POST))-> response-code(400)" \ ) /subsystem=undertow/server=default-server/host=default-host/filter-ref=keycloakPathOverrideUsersCreateEndpoint:add()
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2033602
- https://github.com/keycloak/keycloak/issues/9247
- https://github.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://access.redhat.com/security/cve/CVE-2021-4133
- https://access.redhat.com/errata/RHSA-2021:5217
- https://access.redhat.com/errata/RHSA-2021:5219
- https://access.redhat.com/errata/RHSA-2021:5218
- https://access.redhat.com/security/cve/cve-2021-4133
- https://access.redhat.com/errata/RHSA-2022:0015
- https://access.redhat.com/errata/RHSA-2022:0034
- https://access.redhat.com/errata/RHSA-2022:0152
- https://access.redhat.com/errata/RHSA-2022:0151
- https://access.redhat.com/errata/RHSA-2022:0155
- https://access.redhat.com/errata/RHSA-2022:0164
- https://www.cve.org/CVERecord?id=CVE-2021-4133 https://nvd.nist.gov/vuln/detail/CVE-2021-4133 https://github.com/keycloak/keycloak/issues/9247 https://github.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2021-4133?
CVE-2021-4133 is a vulnerability found in Keycloak versions from 12.0.0 and before 15.1.1.
What is the severity of CVE-2021-4133?
The severity of CVE-2021-4133 is high with a CVSS score of 8.3.
How does CVE-2021-4133 impact Keycloak?
CVE-2021-4133 allows an attacker with any existing user account to create new default user accounts via the administrative REST API even when new user registration is disabled.
How can I fix CVE-2021-4133?
To fix CVE-2021-4133, it is recommended to upgrade Keycloak to version 15.1.1 or above.
Where can I find more information about CVE-2021-4133?
You can find more information about CVE-2021-4133 on the Red Hat Security Advisory RHSA-2021:5217 and RHSA-2021:5219.
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