47 lines
3.6 KiB
Markdown
47 lines
3.6 KiB
Markdown
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# Kerberos Double Hop Problem
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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 to 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 by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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## Introduction
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The Kerberos "Double Hop" problem appears when an attacker attempts to use **Kerberos authentication across two** **hops**, for example using **PowerShell**/**WinRM**.
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When an **authentication** occurs through **Kerberos**, **credentials** **aren't** cached in **memory.** Therefore, if you run mimikatz you **won't find credentials** of the user in the machine even if he is running processes.
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This is because when connecting with Kerberos these are the steps:
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1. User1 provides credentials and **domain controller** returns a Kerberos **TGT** to the User1.
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2. User1 uses **TGT** to request a **service ticket** to **connect** to Server1.
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3. User1 **connects** to **Server1** and provides **service ticket**.
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4. **Server1** **doesn't** have **credentials** of User1 cached or the **TGT** of User1. Therefore, when User1 from Server1 tries to login to a second server, he is **not able to authenticate**.
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## References
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* [https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/understanding-kerberos-double-hop/ba-p/395463?lightbox-message-images-395463=102145i720503211E78AC20](https://techcommunity.microsoft.com/t5/ask-the-directory-services-team/understanding-kerberos-double-hop/ba-p/395463?lightbox-message-images-395463=102145i720503211E78AC20)
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<details>
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||
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|
||
|
|
<summary><strong>Support HackTricks and get benefits!</strong></summary>
|
||
|
|
|
||
|
|
* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to 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)
|
||
|
|
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
||
|
|
* **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 by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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