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For our true first domain example, we need to undertake the scripting process, which can be done with simple ASCII-based utilities What lies ahead is not complex programming but rather simple ingenuity in getting the desired script written, compiled, and executed so that it will repeatedly make the attempts for as long as our dictionary is large As mentioned earlier, one of the most widely used tools for scripting modem communications is Procomm Plus and the ASPECT scripting language Procomm Plus has been around for many years and has survived the tests of usability from the early DOS versions to the newest 32-bit versions Also, the help and documentation in the ASPECT language is excellent Our first goal for the scripting exercise is to get a source code file with a script and then to turn that script into an object module Once we have the object module, we need to test it for usability on, say, 10 to 20 passwords and then to script in a large dictionary The first step is to create an ASPECT source code file In old versions of Procomm Plus, ASP files were the source and ASX files were the object Some old versions of Procomm Plus, such as the Test Drive PCPLUSTD (instructions for use and setup can be found at http://wwwm4phr1kcom), allowed for direct ASP source execution when executing a script In new GUI versions of Procomm Plus, these same files are referred to as WAS and WSX files (source and object), respectively Regardless of version, the goal is the same: to create a brute-force script using our examples shown earlier that will run over and over consistently using a large amount of dictionary words Creating the script is a relatively low-level exercise, and it can generally be done in any common editor The difficult part is inputting the password or other dictionary variables into the script Procomm Plus has the ability to handle any external files that.

UNIX s simplicity and power stem from its use of files be they binary executables, text-based configuration files, or devices Everything is a file with associated permissions If the permissions are weak out of the box, or the system administrator changes them, the security of the system can be severely affected The two biggest avenues of abuse related to SUID root files and world-writable files are discussed next Device security (/dev) is not addressed in detail in this text because of space constraints; however, it is equally important to ensure that device permissions are set correctly Attackers who can create devices or read or write to sensitive system resources such as /dev/kmem or to the raw disk will surely attain root access Some interesting proof-of-concept code was developed by Mixter and can be found at http://mixterwarrior2kcom/rawpowrc This code is not for the faint of heart as it has the potential to damage your file system It should only be run on a test system where damaging the file system is not a concern

@ 3600 r/min Oz-in 01401 01867 02801 03735 05602 14006 18674 28011 37348 40016 46685 56023 70028 93371 112045 140056 186742 233427 280113 350141 466854 700282 933709 mN-m 09890 13187 13187 19780 26374 39561 98902 131869 197803 263737 282576 395606 494508 659344 791212 989015 1318687 1648359 1978031 2472538 3296718 4945077 6593436 (continued)

Popularity: Simplicity: Impact: Risk Rating: 3 10 8 7

8:

The fourth domain builds off of our third domain Now, because two things are to be guessed (provided you don t already know a user ID) and you have to dial back after a limited amount of attempts, this process theoretically takes the most time to execute of any of our previous domain examples The scripts used to build these approaches are similar in concept to the ones demonstrated earlier Code Listing 6-7 shows the results of attacking a target Code Listing 6-8 is the sample QBASIC program to make the ASPECT script

SUID Files Set user ID (SUID) and set group ID (SGID) root files kill Period! No other file on a UNIX system is subject to more abuse than a SUID root file Almost every attack previously mentioned abused a process that was running with root privileges most were SUID binaries Buffer overflow, race conditions, and symlink attacks would be virtually useless unless the program were SUID root It is unfortunate that most UNIX vendors slap on the SUID bit like it was going out of style Users who don t care about security perpetuate this mentality Many users are too lazy to take a few extra steps to accomplish a given task and would rather have every program run with root privileges To take advantage of this sorry state of security, attackers who gain user access to a system will try to identify SUID and SGID files The attackers will usually begin to find all SUID files and create a list of files that may be useful in gaining root access Let s take a look at the results of a find on a relatively stock Linux system The output results have been truncated for brevity