Gaining SQL Server Access Without A Login

Jason Brimhall shows how you can push your way onto a SQL Server instance without a login:

If you really cannot cause a service disruption to bounce the server into single-user mode, my friend Argenis Fernandez (b | t) has this pretty nifty trick that could help you. Truth be told, I have tested that method (even on SQLExpress) several times and it is a real gem. Is this the only alternative?

Let’s back it up just a step or two first. Not having access to SQL Server is in no way the same thing as not having access to the server. Many sysadmins have access to the windows server. Many DBAs also have access to the Windows server or can at least work with the sysadmins to get access to the Windows server in cases like this. If you have admin access to windows – then not much is really going to stop you from gaining access to SQL on that same box. It is a matter of how you approach the issue. Even to restart SQL Server in single-user mode, you need to have access to the Windows server. So, please keep that in mind as you read the article by Argenis as well as the following.

Beyond the requirement of having local access to the server, one of the things that may cause heartburn for some is the method of editing the registry as suggested by Argenis. Modifying the registry (in this case) is not actually terribly complex but it is another one of those changes  that must be put back the way it was. What if there was another way?

As luck would have it, there is an alternative (else there wouldn’t be this article). It just so happens, this alternative is slightly less involved (in my opinion).

If you’re counting, that’s three methods for the price of one.  It’s also an important reminder that if an attacker has administrative access to your Windows server, there’s not much you can do to prevent that attacker from gaining access to SQL Server.

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