Questions tagged [kerberos]

Kerberos is a network authentication protocol designed to allow nodes, communicating over a non-secure network, to prove their identity to one another in a secure manner.

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5answers
15k views

Why do I need Kerberos when I could just use a username and password to access services?

I have read that Kerberos is used for authenticating users who wish to access services on various servers in an enterprise network, but I still do not understand the purpose of Kerberos. Why doesn't ...
16
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2answers
15k views

Kerberos authentication over the public internet

What are the threats to having the KDC accessible via the internet for remote clients? It's my understanding that the authentication is a challenge/response protocol and that the password is never ...
7
votes
2answers
19k views

What's the difference between Radius and Kerberos?

Is Radius just a better version of Kerberos? I can't find anything about this. If you set up a Radius server in a modern network do you need Kerberos at all?
12
votes
2answers
8k views

Does the Kerberos KDC know the users' plaintext passwords?

In http://www.freebsd.org/doc/handbook/kerberos5.html section 15.7.8.3 “The KDC is a Single Point of Failure” you can read: By design, the KDC must be as secure as the master password database is ...
4
votes
1answer
4k views

Kerberos replay attack

Suppose I want to send a command to a print server on a netwerk that has been secured with Kerberos. To do so, I authenticate myself to the KDC and get a TGT, and then another ticket from the TGS for ...
0
votes
1answer
1k views

A replay attack was detected (4649) & Exchange Healthmailbox

We received alarms for this in our SIEM today. I believe it is expected and just "noise". The alarm was triggered immediately after Exchange cleared the ThrottlingConfig.log. I know Exchange Server ...