Firstly, Kerberos is an authentication protocol, not authorization. In other words, it allows to identify each user, who provides a secret password, however, it does not validates to which resources or services can this user access.
Kerberos is used in Active Directory. In this platform, Kerberos provides information about the privileges of each user, but it is responsability of each service to determine if the user has access to its resources.
Default Port: 88/tcp/udp
PORT STATE SERVICE
88/tcp open kerberos-sec
To learn how to abuse Kerberos you should read the post aboutActive Directory.
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Shodan
port:88 kerberos
MS14-068
Simply stated, the vulnerability enables an attacker to modify an existing, valid, domain user logon token (Kerberos Ticket Granting Ticket, TGT, ticket) by adding the false statement that the user is a member of Domain Admins (or other sensitive group) and the Domain Controller (DC) will validate that (false) claim enabling attacker improper access to any domain (in the AD forest) resource on the network.
Protocol_Name: Kerberos #Protocol Abbreviation if there is one.
Port_Number: 88 #Comma separated if there is more than one.
Protocol_Description: AD Domain Authentication #Protocol Abbreviation Spelled out
Entry_1:
Name: Notes
Description: Notes for Kerberos
Note: |
Firstly, Kerberos is an authentication protocol, not authorization. In other words, it allows to identify each user, who provides a secret password, however, it does not validates to which resources or services can this user access.
Kerberos is used in Active Directory. In this platform, Kerberos provides information about the privileges of each user, but it is responsability of each service to determine if the user has access to its resources.
https://book.hacktricks.xyz/pentesting/pentesting-kerberos-88
Entry_2:
Name: Pre-Creds
Description: Brute Force to get Usernames
Command: nmap -p 88 --script=krb5-enum-users --script-args krb5-enum-users.realm="{Domain_Name}",userdb={Big_Userlist} {IP}
Entry_3:
Name: With Usernames
Description: Brute Force with Usernames and Passwords
Note: consider git clonehttps://github.com/ropnop/kerbrute.git ./kerbrute -h
Entry_4:
Name: With Creds
Description: Attempt to get a list of user service principal names
Command: GetUserSPNs.py -request -dc-ip {IP} active.htb/svc_tgs