Does Kerberos provide replay protection?
Kerberos V5 even can’t avoid the replay attack. An attacker can capture all the messages transmitting from the Authentication Server (AS) to the user and apply all possible combination on the messages that he has captured.
What type of attacks do Kerberos authentication protect against?
replay attacks
Kerberos protocol messages are protected against eavesdropping and replay attacks. Kerberos builds on symmetric key cryptography and requires a trusted third party, and optionally may use public-key cryptography during certain phases of authentication.
What does Kerberos protect against?
Kerberos prevents malicious attempts to intercept your password by encrypting your password before transmitting it. In addition, once you and the server have proved your identities to each other, Kerberos uses secret-key cryptography to secure the rest of your communications.
What is anti replay protection?
Anti-replay is a sub-protocol of IPsec that is part of Internet Engineering Task Force (IETF). The main goal of anti-replay is to avoid hackers injecting or making changes in packets that travel from a source to a destination.
What do you need to know about Kerberos attacks?
Persistence: The days of stolen data being dumped all at once are largely over – attackers often prefer to remain on the network undiscovered for extended periods of time, funneling information out little –by – little. Kerberos attacks give attackers what they need most to do this: time.
What happens when a Kerberos authentication message is rejected?
When Server-Side Kerberos validates an authentication message, it will check the authenticator’s timestamp. If the timestamp is earlier or the same as a previous authenticators received within the five minutes, it will reject the packet because it treats it as a replay attack and user authentication will fail.
What can you do with a Kerberos ticket?
You can be anyone (assuming you have their hash), add any account to any group (including highly privileged groups), and for that matter, do anything you want within Kerberos authentication capabilities. You can even create usable Kerberos tickets for user/computer/service accounts that don’t even exist in Active Directory.
How can I protect against a replay attack?
Or you can use some other system that takes a sub-session key from the authenticator as a pre-shared key and has replay protection; a TLS-PSK protocol with the sub-session key as PSK would probably work (TLS protects against replay attacks).