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The krbtgt password reset impact is a blog post by ALI TAJRAN, where he talks about the impact of the krbtgt account password reset.
When was the last time you updated the password on your Account KRBTGT? If you don’t know the answer, it’s probably a warning sign. Did you know that Microsoft advises changing the password on the KRBTGT account at least once every 180 days? In this post, we’ll look at the KRBTGT account and how to use a PowerShell script to reset the password.
The KRBTGT account is a local default account that is used by the Key Distribution Center (KDC) service as a service account. This account cannot be deleted, nor can the name of the account be altered. In Active Directory, the KRBTGT account cannot be activated.
According to RFC 4120, KRBTGT is also the security principle name used by the KDC for a Windows Server domain. When a new domain is established, the KRBTGT account is generated automatically as the entity for the KRBTGT security principal.
Note: Every 180 days, you must reset the password for the KRBTGT account on a domain.
KRBTGT Account Password Reset Scripts are now accessible for consumers, according to an official Microsoft post.
Check the last time your KRBTGT account password was changed.
Users and Computers in Active Directory should be started (ADUC). Enable Advanced Features by selecting View from the menu bar.
To access the properties of the user object krbtgt, locate it and double-click it. Select the Attribute Editor tab. Look for the pwdLastSet property.
Note: By default, the SID for the KRBTGT account is S-1-5–502, and it is located in the Users OU of the domain. Moving this account to another OU is not recommended by Microsoft.
The KRBTGT account, in our example, was reset on December 28, 2020.
Run the Get-ADUser cmdlet in PowerShell to verify the KRBTGT account password last set time.
Get-ADUser “krbtgt” -Property Created, PasswordLastSet Created : 12/28/2020 11:59:33 PM PS C:> Get-ADUser “krbtgt” -Property Created, PasswordLastSet Created : 12/28/2020 11:59:33 PM DistinguishedName: CN=krbtgt,CN=Users,DC=exoip,DC=local DistinguishedName: CN=krbtgt,CN=Users,DC=exoip,DC=local Activated : False FirstName : krbtgt is a krbtgt is a krbtgt user is an object class. ObjectGUID: fc7f7914-8bd5-4690-a20f-a31b616f9209 ObjectGUID: fc7f7914-8bd5-4690-a20f-a31b616f9209 LastPasswordSet : 12/28/2020 11:59:33 PM LastPasswordSet : 12/28/2020 11:59:33 PM LastPasswordSet : 12/28/2020 krbtgt krbtgt krbtgt krbtgt kr S-1-5-21-977191366-1912192012-2791039455-502 S-1-5-21-977191366-1912192012-2791039455-502 S-1-5-21-977191366-1912192012-279 UserPrincipalName: UserName: UserName: UserName: UserName: UserName: UserName: UserName: UserName:
KRBTGT account passwords are changed on a regular basis.
How frequently do you need to change the password on your KRBTGT account? At least once every 180 days, change the password on your KRBTGT account. To properly erase the password history, the password must be updated twice. The chance of problems is reduced by modifying once, waiting for replication to finish, and then changing again. Clients must re-authenticate (including application services) when the password is changed twice in a short period of time, although this is desirable if a breach is detected.
Important: We do not suggest scheduling the PowerShell script as an automatic job since it may fail due to a variety of factors.
Account password reset for KRBTGT Script in PowerShell
Log in to the Doman Controller or Management Server using your username and password.
GitHub or straight download the KRBTGT password reset script. Reset-KrbTgt-Password-For-RWDCs-And-RODCs is the official script name. ps1. It is currently on version 2.8 at the time of writing. To avoid any problems while executing the script, make sure the file is unblocked. More information may be found in the article. When executing a PowerShell script, an error occurs because it is not securely signed.
Jared Poeppelman wrote the first version (Microsoft). The screenplay was then rewritten by Jorge de Almeida Pintore, who introduced a slew of new features, and version 2 was created. Version 2 is recommended.
In the C:Scripts folder, save the script. If you don’t already have one, make one.
As an administrator, run Windows PowerShell. Run the script by changing the path to the scripts folder.
PS C:scripts>.Reset-KrbTgt-Password-For-RWDCs-And-RODCs.ps1 PS C:scripts>.Reset-KrbTgt-Password-For-RWDCs-And-RODCs.ps1
If you want to learn more about the KRBTGT password reset script, you may read about its features, functions, behavior, and effect. Yes, and then go through the material.
When you’ve finished reading the material, you’ll be presented with nine choices from which to choose.
These are the ones we’ll use:
- 5 – Simulation Mode | Use KrbTgt PROD/REAL Accounts – No Password Reset!
- 6 – Real Reset Mode | Use KrbTgt PROD/REAL Accounts – Only Reset Password Once!
Option 5 will have no effect on the environment and will simply show you everything that will happen. The KRBTGT password will be reset if you choose Option 6.
Mode of simulation
Option 5 should be selected.
For the present AD forest, type in the FQDN of the AD forest that will be targeted, or press enter. We like to go after the forest exoip.local, which is where we are right now. After that, hit the Enter key.
Fill in the FQDN for the AD domain that will be targeted, or enter for the present domain. We prefer to use the domain exoip.local, which we are now using. After that, hit the Enter key.
Choose which KRBTGT account you’d want to attack. Choose one. Press Enter after typing Continue.
Proceed to the next step if everything seems okay.
Follow the procedures outlined above. This time, though, choose option 6.
The result will indicate that the account KRBTGT has a new password.
The KRBTGT account password reset script successfully reset the KRBTGT account password.
Make sure your KRBTGT account password is correct.
Users and Computers in Active Directory should be started (ADUC). To access the properties of the user object krbtgt, locate it and double-click it. Select the Attribute Editor tab. Look for the pwdLastSet property.
We can see that the KRBTGT account was successfully reset on September 9, 2021 in our case (today).
So, what’s next?
Wait for AD replication to finish before changing the KRBTGT password in the same way. It’s acceptable and encouraged to wait for replication to finish if you have a multi-site. Then, the following day, execute the script to change the password for the KRBTGT account.
To properly erase the password history, the password must be updated twice. The chance of problems is reduced by modifying once, waiting for replication to finish, and then changing again.
After the second password reset, look at the KRBTGT account’s pwdLastSet property.
That concludes our discussion.
You now know how to change the password on your KRBTGT account. First, run the PowerShell script to reset the KRBTGT account password in simulation mode. Then, in actual reset mode, execute the PowerShell script. Remember to wait for AD replication to finish before rerunning the script to erase the password history.
Did you find this article to be interesting? Force password sync with Azure AD Connect is another option. Don’t forget to subscribe to our newsletter and share this post.
The krbtgt password change frequency is a question that many people have. If you are trying to reset your account password, there is a specific frequency that must be met in order for the process to work.
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