A vulnerability was found in Keycloak. The LDAP testing endpoint allows changing the Connection URL  independently without re-entering the currently configured LDAP bind credentials. This flaw allows an attacker with admin access (permission manage-realm) to change the LDAP host URL ("Connection URL") to a machine they control. The Keycloak server will connect to the attacker's host and try to authenticate with the configured credentials, thus leaking them to the attacker. As a consequence, an attacker who has compromised the admin console or compromised a user with sufficient privileges can leak domain credentials and attack the domain.

Affected: Maven: org.keycloak:keycloak-ldap-federation

### Impact

The LDAP testing endpoint allows to change the Connection URL independently of and without having to re-enter the currently configured LDAP bind credentials. An attacker with admin access (permission manage-realm) can change the LDAP host URL ("Connection URL") to a machine they control. The Keycloak server will connect to the attacker's host and try to authenticate with the configured credentials, thus leaking them to the attacker. As a consequence, an attacker who has compromised the admin console/compromised a user with sufficient privileges can leak domain credentials and can now attack the domain.

### Acknowledgements

Special thanks to Simon Wessling for reporting this issue and helping us improve our project

keycloak: potential bypass of brute force protection keycloak: Leak of configured LDAP bind credentials through the Keycloak admin console wildfly-elytron: org.keycloak/keycloak-services: session fixation in elytron saml adapters

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Keycloak ausnutzen, um Informationen offenzulegen.