Before we jump into an example penetration test, we must know why we prefer Metasploit to manual exploitation techniques. Is this because of a hacker-like Terminal that gives a pro look, or is there a different reason? Metasploit is a preferable choice when compared to traditional manual techniques because of specific factors that are discussed in the following sections.
Benefits of penetration testing using Metasploit
Open source
One of the top reasons why one should go with the Metasploit framework is because it is open source and actively developed. Various other highly paid tools exist for carrying out penetration testing. However, Metasploit allows its users to access its source code and add their custom modules. The Pro version of Metasploit is chargeable, but for the sake of learning, the community edition is mostly preferred.
Support for testing large networks and natural naming conventions
Using Metasploit is easy. However, here, ease of use refers to natural naming conventions of the commands. Metasploit offers excellent comfort while conducting a massive network penetration test. Consider a scenario where we need to test a network with 200 systems. Instead of checking each system one after the other, Metasploit offers to examine the entire range automatically. Using parameters such as subnet and Classless Inter-Domain Routing (CIDR) values, Metasploit tests all the systems to exploit the vulnerability, whereas using manual techniques, we might need to launch the exploits manually onto 200 systems. Therefore, Metasploit saves a significant amount of time and energy.
Smart payload generation and switching mechanism
Most importantly, switching between payloads in Metasploit is easy. Metasploit provides quick access to change payloads using the set payload command. Therefore, turning the Meterpreter or shell-based access into a more specific operation, such as adding a user and getting the remote desktop access, becomes easy. Generating shellcode to use in manual exploits also becomes easy by using the msfvenom application from the command line.
Cleaner exits
Metasploit is also responsible for making a much cleaner exit from the systems it has compromised. A custom-coded exploit, on the other hand, can crash the system while exiting its operations. Making a clean exit is indeed an essential factor in cases where we know that the service will not restart immediately.
Consider a scenario where we have compromised a web server, and while we were making an exit, the exploited application crashes. The scheduled maintenance time for the server is left over with 50 days' time. So, what do we do? Shall we wait for the next 50 odd days for the service to come up again, so that we can exploit it again? Moreover, what if the service comes back after being patched? We could only end up kicking ourselves. This also shows a clear sign of poor penetration testing skills. Therefore, a better approach would be to use the Metasploit framework, which is known for making much cleaner exits, as well as offering tons of post-exploitation functions, such as persistence, that can help maintain permanent access to the server.
The GUI environment
Metasploit offers friendly GUI and third-party interfaces, such as Armitage. These interfaces tend to ease the penetration testing projects by providing services such as easy-to-switch workspaces, vulnerability management on the fly, and functions at a click of a button. We will discuss these environments more in the later chapters of this book.
