A new tab for your requested boot camp pricing will open in 5 seconds. If it doesn't open, click here. His trackrecord consists of many years of Systems and Security administration, both in Europe and in Australia. He has a true passion for anything related to pentesting and vulnerability assessment and can be found on au. His Twitter handle is franksiemons. If this is the case, why would anyone put their database server on their corporate network and not a dmz?
Your email address will not be published. Posted: November 29, We've encountered a new and totally unexpected error. Get instant boot camp pricing. Thank you! In this Series. Attacking MS SQL server to gain system access Understanding hackers: The 5 primary types of external attackers Want to improve the security of your application?
Think like a hacker 5 problems with securing applications Why you should build security into your system, rather than bolt it on Why a skills shortage is one of the biggest security challenges for companies How should your company think about investing in security?
The difference between cross-site and server-side request forgery 7 most common application backdoors Advanced. Related Bootcamps. Incident Response. Waqar says:. That was the key to this project.
Since the TDS query data includes those null bytes, some of the characters are not printable. This meant that I could not merely search for a simple string and replace it with another string. I needed a way to search for a non-printable null byte. Since I cannot type null on a keyboard, I needed another way.
Kali includes a program called hexdump that can be used to convert strings to hexadecimal. The first line ensures that the filter will only run on TCP traffic with a destination port of If this matches, the filter will output a debugging message to the console to let me know that it found SQL traffic.
If the filter locates that string, it will output another debugging message to the console. Finally, the magic happens. This was just a test to see if the script would run properly. It is important to note that when you replace data in a TCP packet, you must replace it with the exact same number of bytes.
If the size of the packet changes, the TCP connection will break. Once the filter is written, it must be compiled. This is easily accomplished with the etterfilter command. There were no errors, so the filter was now ready for testing. I fired up Wireshark and verified that I was seeing traffic being sent between the two victims.
Everything was looking positive. The next step was to switch back to the workstation and try executing the query. I executed the query, but this time I did not receive the empty table result as I did originally.
Instead, I received an error. The filter worked exactly as expected. That was one step in the right direction. The next step was to replace the entire query string with something that will help me as the attacker. I decided to try to add a login to the server. This would be pretty much the best possible scenario for me as an attacker, especially since in this case the workstation victim is logging in as the SA user.
After converting everything to hex, I updated the mssql. I mentioned earlier that you must replace TCP data with the exact same amount of data. So how did I handle that since my new query is shorter than the original? I just added some spaces to the end of my new query with the null bytes surrounding them.
I compiled the filter just like before and then loaded it up into Ettercap. Then I submitted the query from the workstation. Notice the difference between this response and the response before I used the Ettercap filter? Originally, the query returned an empty table. This time, no table was returned. Unfortunately, they would be too late. I just added my own account to the database system.
Now, the real hack was about to take place. From the Windows 10 workstation, I logged out of the SA account and then attempted to log in using my hopefully newly created anitian account. I was now logged in with my own account. Unfortunately, this account did not have a lot of rights, so I could not do much. However, that could be solved. At this point, I could have easily done all this, but it is rather tedious to do all the hex conversions by hand, and then add all of those null bytes and such.
Who wants to go through all of that effort? This was a good enough proof of concept right? No way! I was not about to give up that quickly. Besides, why do all that tedious work, when I can automate the entire process using a script! The SQLinject. This script automates the entire process from converting the SQL queries to hex all the way to performing the ARP spoofing and loading the Ettercap filter. It makes the process extremely easy. I knew I wanted to give the anitian user sysadmin privileges.
After a quick lesson in SQL commands, I was able to design with the correct query:. This would add my new anitian user to the sysadmin role on the server, giving me access to pretty much anything I want.
Now that I had all four key pieces of information, I ran the script like this:. Using the script, I do not have to worry about those pesky hex conversions or null bytes. The script handles it all for me. It will perform the conversions and then output an Ettercap filter to mssql. From there, it runs etterfilter and compiles the filter into mssql. Finally, the script even loads up the command line interface to Ettercap, performs the ARP spoofing attack against the server and workstation and loads the filter!
Run the utility sqlcmd c:windowssystem32sqlcmd. Also you can change SA password from sqlcmd line: Similarly, you can get administrator rights on all supported versions of MS SQL Server, starting from and ending to This site uses cookies to analyze traffic, personalize your experience and serve ads. Thus, you will attain the username:sa and password of your victim.
From given below image you can observe the same password: [email protected] have been found by Metasploit. Given below command will attempt to determine username and password through brute force attack against MS-SQL by means of username and password dictionary. In the specified image, you can observe that we had successfully retrieve credential for usersUsername: sa and password: [email protected]. Contact Here. Skip to content Hacking Articles. Password Cracking.
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