This is the third and last part about RDP, protecting credentials and delegation models.
This time it’s about Remote Credential Guard, pros and cons and how to model this with LAPS and Just in Time Admin Access. I haven’t had much time to write this so I will keep it short and simple with a few examples.
Remote Credential Guard
Remote Credential Guard (RCG) was introduced in Windows Server 2016 and Windows 10 version 1607. It’s a new way to protect your RDP session from credential thefts like Pass the Hash, some Pass the Ticket and other LSASS dumps on the target computer. It provides SSO and your credentials is never exposed on the remote machine. This helps in a way that if a admin of any level connects to a compromised machine, his domain credentials won’t be exposed on the target machine preventing lateral movement in that way.
It relies on Kerberos and all service ticket requests in the RDP session on the server is routed to the client. Continue reading →
Shadow Principals is a new cool feature in Active Directory 2016. It’s part of the Optional Feature Privileged Access Management. I have covered the basic concept with Just In Time Admin Access two years ago, and I also wrote about time-based groups a year ago.
The first article is kind of outdated and everything wasn’t fully implemented yet. Missing pieces was Shadow Principals and PIM Trusts. So, I decided to write an article about it and how to test it with basic built-in functionality.
Just a quick background if you don’t want to read earlier posts:
A while back Microsoft release a guidance of Securing Privileged Access.
In step three they include creating one and even two new forests for managing privileged admin accounts (in this example we will use one). You can read more about it here: ESAE Administrative Forest Design Approach.
The idea is: to secure the existing production domain, a shadow forest will be created and is a single domain forest built on Windows Server 2016, it is hardened and locked down from day one. By using the new PAM feature we can create Shadow Principals based on the production domain and grant time limited access (which also is integrated in Kerberos).
The administrative groups in the production domain will be empty and kind of remove the map of admins in the domain. The shadow admins will only have administrative access in the production domain when needed providing just-in-time administration (JIT).
With this, Microsoft Identity Manager also comes in to play with its PAM feature managing this in the Shadow Forest, where users can request admin access.
In this example, we won’t use MIM, we will look at the Shadow Principal and test the PAM feature in Active Directory at its core basics. Continue reading →
When talking about security in Active Directory a big challenge is the delegation and how to protect the admin accounts and groups. Microsoft has release two whitepapers about this subject.
Best Practices for Delegating Active Directory Administration
Best Practices for Securing Active Directory
The delegation highlights the security model in Active Directory which is important to understand and have in mind to get the best out of it. It’s not an easy task to manage and has many dependencies of administrative users and systems to keep in mind when setting this up.
This goes hand in hand with securing your Active Directory environment since you have very high privileged accounts, and if the wrong persons gets on hold of it, it can do some great damage to the whole company. Continue reading →