What was the worst bug you've ever solved ?
WesleyJohnson: I'm still a little new to the game, so I've only had one hacking job thus far. It spanned 4 years and taught me a lot about what to do and what not to do. I could type a small book about all the crazy things they did in that company and the nightmare of spaghetti code, the needlessly complex 3000+ table database, but I'll try to focus on just a few things that went wrong over the years or that needed fixed.Two of the previous employees got into a debate on whether or not you could directly connect to the database through  JavaScript and fetch recordsets, etc. To prove that you could, one to the developers did just that...and left it in place...in production...with the full connection string and user credentials in plain site in the javascript code on the page.Countless sql injection holes were plugged over the years, but not before we got hit with an attack that plugged javascript ad code into 50 or more tables and a few hundred thousand rows.The initial developers used ".inc" as the file extensions for include files like headers, footers and database access. These files sometimes had html, javascript, asp or all 3. You never knew. The problem was IIS treated these like text files and would gleefully serve them up if accessed them directly - revealing server side sourcecode, more connection strings, etc, etc.Our accounting "system" was woefully inadequate. Our sales people always said "yes" and we eventually ran into some clients that wanted their invoices formatted and calculated in a way our system couldn't handle. We were always far too busy to take the time needed to properly engineer the new solution, so this one clients bill was done manually - through SQL Management Studio - every month, for close to two years before I left. Reconciliation of the bill, was also done manually. The kicker is, billing was done based on dates that assignments were completed. These dates were not only not locked down once billing had begun, but new assignments could be injected into the billing period long after the invoice was generated, because multiple factors. Needless to say, it took me half a day, once a month to reconcile their invoices and on several occasions, due to the very manual nature, payments were applied to the wrong assignments, transactions, etc. Once to the tune of $200,000. That was fun to fix. :)I could go on and on and on and on....