Goldberg, Miro Haller, Nadia Heninger, Mike Milano, Dan Shumow, Marc Stevens, and Adam Suhl discovered that FreeRADIUS incorrectly authenticated certain responses. An attacker able to intercept communications between a RADIUS client and server could possibly use this issue to forge responses, bypass authentication, and access network devices and services. This update introduces new configuration options called "limit_proxy_state" and "require_message_authenticator" that default to "auto" but should be set to "yes" once all RADIUS devices have been upgraded on a network.
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