94 lines
5.0 KiB
Markdown
94 lines
5.0 KiB
Markdown
# 88tcp/udp - Pentesting Kerberos
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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</details>
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## Basic Information
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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.\
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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.
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**Default Port:** 88/tcp/udp
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```
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PORT STATE SERVICE
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88/tcp open kerberos-sec
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```
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### **To learn how to abuse Kerberos you should read the post about** [**Active Directory**](../../windows-hardening/active-directory-methodology/)**.**
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## More
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### Shodan
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* `port:88 kerberos`
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### MS14-068
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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.
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{% embed url="https://adsecurity.org/?p=541" %}
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Other exploits: [https://github.com/SecWiki/windows-kernel-exploits/tree/master/MS14-068/pykek](https://github.com/SecWiki/windows-kernel-exploits/tree/master/MS14-068/pykek)
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## HackTricks Automatic Commands
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```
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Protocol_Name: Kerberos #Protocol Abbreviation if there is one.
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Port_Number: 88 #Comma separated if there is more than one.
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Protocol_Description: AD Domain Authentication #Protocol Abbreviation Spelled out
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Entry_1:
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Name: Notes
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Description: Notes for Kerberos
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Note: |
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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.
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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.
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https://book.hacktricks.xyz/pentesting/pentesting-kerberos-88
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Entry_2:
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Name: Pre-Creds
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Description: Brute Force to get Usernames
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Command: nmap -p 88 --script=krb5-enum-users --script-args krb5-enum-users.realm="{Domain_Name}",userdb={Big_Userlist} {IP}
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Entry_3:
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Name: With Usernames
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Description: Brute Force with Usernames and Passwords
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Note: consider git clonehttps://github.com/ropnop/kerbrute.git ./kerbrute -h
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Entry_4:
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Name: With Creds
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Description: Attempt to get a list of user service principal names
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Command: GetUserSPNs.py -request -dc-ip {IP} active.htb/svc_tgs
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```
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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