Saturday, July 30, 2011

Course Review: ITIL v3 Foundations

The company that I work for is in a transitions phase.  One of the big things that they are trying to do is implement more ITIL processes inside of IT.  With this, they have sent off the permanent IT staff to ITIL v3 foundations training.

ITIL is a buzz word in the industry and has been since v3 was released (2007?).  Those companies that practice in the art form known as "certification shopping" have long weeded out any resumes that do not contain the precious ITIL buzz word.

I quite enjoyed the course, although it was very high level and dry.  Our instructor was exceptional, however, which made for some interesting discussions in this 3 day course.  I view ITIL training (at least at the foundations level) more a training on language than any specifics in the IT industry.  The foundations course main focus is to establish a baseline of knowledge and terms that can then be used by people to communicate effectively.  If you don't know the ITIL definition for a function, for example, you would be pretty lost in a conversation about it.  Furthermore, you'd probably find it quite hard to get a good idea of your job role if it was described solely in ITIL terms.

In any event, it was a course worth taking.  I definitely learned something out of it, even if it was just the terms ITIL uses to describe the best practices in use today.

Sunday, July 10, 2011

HackThisSite - Realistic 6 Solution

It has been a while since I last posted. The only excuse I have is that it is "summer".

In any event, I decided to do a nice simple one to get back into things.

The "goal" behind hts 6 is to actually code the solution. As a penetration tester, you need to be able to write your own scripts to accomplish very specific tasks. You an find a lot of info on XECryption from here or here.  So I'm not going to go through the gory details about how to "crack" XECryption.

This is a good opportunity to pick a language that you do not know well in order to practice it.  I picked c# because I wanted to do more with LINQ.

In any event, here is my solution.  Pass in the full path to the file you wish to decrypt.  Pipe the output to a file.  Send the output (minus the first line saying it found the key) to ToxiCo_Watch.

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text.RegularExpressions;

namespace XECryptionDecrypter
    class Program
        static void Main(string[] args)
            var encryptedFile = ParseArguments(args);

        private static void ProcessFile(FileInfo encryptedFile)
            var encryptedContents = File.ReadAllText(encryptedFile.FullName);
            var chunks = GetChunks(encryptedContents);
            var key = DeterminePasswordKey(chunks);
            Console.WriteLine("Found key: " + key);

            foreach (var chunk in chunks)


        private static int DeterminePasswordKey(List<ChunkedNumber> chunks)
            var mostCommonChunkedValue = chunks.GroupBy(x => x.Total).OrderByDescending(x => x.Count()).First();
            var key = mostCommonChunkedValue.First().Total - 32;
            return key;

        private static void PrintDecryptedChunk(ChunkedNumber number, int key)
            Console.Write(char.ConvertFromUtf32(number.Total - key));

        private static List<ChunkedNumber> GetChunks(string encryptedContents)
            var encryptedContentsWithoutReturns = encryptedContents.Replace(Environment.NewLine, "");
            var chunkPattern = @"(\.\d+\.\d+\.\d+)";
            var chunkRegex = new Regex(chunkPattern);
            return (from match in chunkRegex.Split(encryptedContentsWithoutReturns) where !String.IsNullOrWhiteSpace(match) select new ChunkedNumber(match)).ToList();

        private static FileInfo ParseArguments(string[] args)
            if (args.Length < 1)
                throw new ArgumentException("Please provide decrypted file path as argument 1");

            var filePath = args[0];

            if (!String.IsNullOrWhiteSpace(filePath) && File.Exists(filePath))
                return new FileInfo(filePath);

            throw new ArgumentException(string.Format("File with path {0} not found",filePath));

    class ChunkedNumber
        public int Number1 { get; private set; }
        public int Number2 { get; private set; }
        public int Number3 { get; private set; }
        public int Total { get; private set; }
        public string Raw { get; private set; }

        public ChunkedNumber(string raw)
            var formattedString = raw.Replace(".", ",").Substring(1);
            var rawNumbers = formattedString.Split(',');
            Raw = raw;
            Number1 = int.Parse(rawNumbers[0]);
            Number2 = int.Parse(rawNumbers[1]);
            Number3 = int.Parse(rawNumbers[2]);
            Total = Number1 + Number2 + Number3;