A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the users credentials. The highest threat from this vulnerability is to confidentiality and integrity.
Weakness
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Keycloak | Redhat | * | 18.0.0 (excluding) |
| Single_sign-on | Redhat | 7.0 (including) | 7.0 (including) |
| Red Hat Single Sign-On 7.5 for RHEL 7 | RedHat | rh-sso7-keycloak-0:15.0.4-1.redhat_00001.1.el7sso | * |
| Red Hat Single Sign-On 7.5 for RHEL 8 | RedHat | rh-sso7-keycloak-0:15.0.4-1.redhat_00001.1.el8sso | * |
| RHEL-8 based Middleware Containers | RedHat | rh-sso-7/sso75-openshift-rhel8:7.5-15 | * |
| RHSSO 7.5.1 | RedHat | keycloak-server-spi-private | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/114.html
- https://cwe.mitre.org/data/definitions/115.html
- https://cwe.mitre.org/data/definitions/151.html
- https://cwe.mitre.org/data/definitions/194.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/593.html
- https://cwe.mitre.org/data/definitions/633.html
- https://cwe.mitre.org/data/definitions/650.html
- https://cwe.mitre.org/data/definitions/94.html
References
- https://access.redhat.com/security/cve/CVE-2021-3827
- https://bugzilla.redhat.com/show_bug.cgi?id=2007512
- https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
- https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v
- https://access.redhat.com/security/cve/CVE-2021-3827
- https://bugzilla.redhat.com/show_bug.cgi?id=2007512
- https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
- https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v