Hacking Servers: A Beginner's Guide By: Lord Dredd I am asked at least 5 or more times a day by young, beginning "hackers", "How can I hack?" or "Is there a way to hack a web site?" Well there is. There are, in fact, literally hundreds of ways to do this. I will discuss a few in this text to get you started. Every hacker has to start somehow and hacking web servers and ftp servers is one of the easiest ways. If you are reading this I am assuming that you already have a basic knowledge of how web servers work and how to use some form of UNIX. But I am going to explain that stuff anyway for those of you who don't know. Part 1: Simple UNIX Commands Most DOS commands have UNIX and Linux equivalents. Listed below are some of the main commands you will need to know to use a shell account. HELP = HELP COPY = CP MOVE = MV DIR = LS DEL = RM CD = CD To see who else is on the system you can type WHO. To get information about a specific user on the system type FINGER . Using those basic UNIX commands you can learn all you need to know about the system you are using. Part 2: Cracking Passwords On UNIX systems the file that contains the passwords for all the users on the system is located in the /etc directory. The filename is passwd. I bet your thinking...."Great. All I have to do is get the file called /etc/passwd and I'll be a hacker." If that is what you are thinking then you are dead wrong. All the accounts in the passwd file have encrypted passwords. These passwords are one-way encrypted which means that there is no way to decrypt them. However, there are programs that can be used to obtain passwords from the file. The name of the program that I have found to be the best password cracker is called "Cracker Jack." This program uses a dictionary file composed of thousands of words. It compares the encrypted forms of the words in the list to the encrypted passwords in the passwd file and it notifies you when it finds a match. Cracker Jack can be found at my web site which is at http://www.geocities.com/SiliconValley/9185 Some wordlists can be found at the following ftp site: sable.ox.ac.uk/ pub/wordlists. To get to the wordlist that I usually use goto that ftp site then goto the American directory. Once you are there download the file called dic-0294.tar.Z which is about 4 MB. To use that file it must be uncompressed using a program like Gzip for DOS or Winzip for Windows. After uncompressing the file it should be a text file around 8 MB and it is best to put it in the same directory as your cracking program. To find out how to use Cracker Jack just read the documentation that is included with it. Part 3: The Hard Part (Finding Password Files) Up till now I have been telling you the easy parts of hacking a server. Now we get to the more difficult part. It's common sense. If the system administrator has a file that has passwords for everyone on his or her system they are not going to just give it to you. You have to have a way to retrieve the /etc/passwd file without logging into the system. There are 2 simple ways that this can sometimes be accomplished. Often the /etc directory is not blocked from FTP. To get the passwd file this way try using an FTP client to access the site anonymously then check the /etc directory to see if access to the passwd file is restricted. If it is not restricted then download the file and run Cracker Jack on it. If it is restricted then try plan B. On some systems there is a file called PHF in the /cgi-bin directory. If there is then you are in luck. PHF allows users to gain remote access to files (including the /etc/passwd file) over the world wide web. To try this method goto your web browser and type in this URL: http://xxx.xxx.xxx/cgi-bin/phf?Qalias=x%0a/bin/cat%20/etc/passwd Then substitute the site you are trying to hack for the xxx.xxx.xxx. For example, if I wanted to hack St. Louis University (and I have already) I would type in http://www.slu.edu/cgi-bin/phf?Qalias=x%0a/bin/cat%20/etc/passwd Don't bother trying www.slu.edu because ... texts ...