The key distribution attack exploits a weakness in the RADIUS protocol. The key distribution attack relies on an attacker capturing the PMK transmission between the RADIUS server and the AP. As the PMK is transmitted outside of the TLS tunnel, its protection is solely reliant on the RADIUS server's HMAC-MD5 hashing algorithm. Should an attacker be able to leverage a man-in-the-middle attack between the AP and RADIUS sever, a brute-force attempt could be made to crack the RADIUS shared secret. This would ultimately provide the attacker with access to the PMK - allowing full decryption of all traffic between the AP and supplicant.
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The RADIUS impersonation attack relies on users being left with the decision to trust or reject certificates from the authenticator. Attackers can exploit this deployment weakness by impersonating the target network's AP service set identifier (SSID) and RADIUS server. Once both the RADIUS server and AP have been impersonated the attacker can issue a 'fake' certificate to the authenticating user. After the certificate has been accepted by the user the client will proceed to authenticate via the inner authentication mechanism. This allows the attacker to capture the MSCHAPv2 challenge/response and attempt to crack it offline. 2ff7e9595c
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