As last year, the French conference No Such Con returns for its second edition in Paris from the 19th of November until the 21th of November. And again, the brilliant Eloi Vanderbeken put together a series of three security challenges especially for this occasion. Apparently, the three tasks have already been solved by awesome @0xfab which won the competition, hats off :).
But this time we are trying something different though: this post has been co-authored by both Emilien Girault (@emiliengirault) and I. As we have slightly different solutions, we figured it would be a good idea to write those up inside a single post. This article starts with an introduction to the challenge and will then fork, presenting my solution and his.
As the article is quite long, here is the complete table of contents:
- REcon: Here be dragons
- Let’s get our hands dirty
- Father’s in charge
- Gearing up: Writing a symbolic executing engine
- Back into the battlefield
- Unscramble the code like a sir
- Attacking the son: the last man standing
- Alternative solution
- War’s over, the final words