Though this can appear for many reasons, you’ll want to examine the error reason and look for “Password did not match”. The easiest place to find this type of attack is in the SQL Server error logs. Now that we’ve been attacked, where do we look? To run the demo, we drop to a command prompt and execute the following: To view which are available, run the application with the -? switch.īRUTE -crack:SQL01 -U:Joe Brute force in actionįor the purposes of this blog I have created a user named Steve. The Brute application has a few switches.
Library.txt – Contains a list of sample passwords to feed the brute application. Brute.exe – Simulates an attack on the server. The two files needed to run the demo are Brute.exe and Library.txt. Once the source is downloaded, you can either choose to open the file in Visual Studio (2013 or later) or navigate to the debug directory, where you’ll find the executable. The download includes the full C# source code. The second is a console application designed to demonstrate a brute force attack. The first tool is a T-SQL script designed to reveal any SQL Server authenticated logins have either a blank password or a password matching the login name. In June of 2015, I added two tools to the Microsoft Technet Gallery which can be used to help achieve better SQL Server security. Hammering and hammering until it is out of potential passwords or is successful. A password file is fed into a login tool and away it goes. This type of attack has no real “brains”, like you see with social engineering techniques. The recent coverage of Apple vs FBI has brought up the topic again, as many news sources claim that the FBI is requesting a tool to “brute force” the pin of a locked phone.īrute force attacks are named as such due to their design. They have been around for a long time and are very simplistic by design. 
In the first entry in this SQL Server security series, we will demonstrate a brute force attack against SQL Server and discuss various techniques to protect against one.
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