A flaw was found in the offline_access scope in Keycloak. This issue would affect users of shared computers more (especially if cookies are not cleared), due to a lack of root session validation, and the reuse of session ids across root and user authentication sessions. This enables an attacker to resolve a user session attached to a previously authenticated user; when utilizing the refresh token, they will be issued a token for the original user.
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Keycloak | Redhat | * | 20.0.2 (excluding) |
| Single_sign-on | Redhat | - (including) | - (including) |
| Red Hat Single Sign-On 7 | RedHat | keycloak | * |
| Red Hat Single Sign-On 7.6.1 | RedHat | keycloak | * |
| Red Hat Single Sign-On 7.6 for RHEL 7 | RedHat | rh-sso7-keycloak-0:18.0.3-1.redhat_00002.1.el7sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 7 | RedHat | rh-sso7-keycloak-0:18.0.6-1.redhat_00001.1.el7sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 8 | RedHat | rh-sso7-keycloak-0:18.0.3-1.redhat_00002.1.el8sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 8 | RedHat | rh-sso7-keycloak-0:18.0.6-1.redhat_00001.1.el8sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 9 | RedHat | rh-sso7-keycloak-0:18.0.3-1.redhat_00002.1.el9sso | * |
| Red Hat Single Sign-On 7.6 for RHEL 9 | RedHat | rh-sso7-keycloak-0:18.0.6-1.redhat_00001.1.el9sso | * |
| RHEL-8 based Middleware Containers | RedHat | rh-sso-7/sso76-openshift-rhel8:7.6-15 | * |
| RHEL-8 based Middleware Containers | RedHat | rh-sso-7/sso76-openshift-rhel8:7.6-20 | * |
Such a scenario is commonly observed when: