50m-ctf: $50 million CTF Writeup

Summary: For a brief overview of the challenge you can take a look at the following image: F451370 Below I will detail each step that I took to solve the CTF, moreover all the bad assumptions that led me to a dead end in some cases. Twitter The CTF begins with this tweet: F451371 What is this...

50m-ctf: CTF Writeup - c8889970d9fb722066f31e804e351993

CTF Code: c8889970d9fb722066f31e804e351993 HackerOne $50M CTF Write-Up ============ I came across this tweet announcing the HackerOne CTF for invitations to the HackerOne event in Vegas during DEFCON. I tried searching for a URL for the CTF, but couldn't find anything online, so I assumed that th...

50m-ctf: CTF write-up: c8889970d9fb722066f31e804e351993

So the CTF starts with this tweet. F434370 The first image is about the 50 million in bounties but the second one looks related to the CTF. The first thing that comes to mind when relating CTFs and images is "steganography". Using the all purpose steg tool zsteg as our first resort, we discover...

50m-ctf: Various vulnerabilities ultimately lead to attacker control over FliteThermostat server and access to internal accounting application source code

Step 1: The Entry Point 3:50 PM PST, Tuesday Afternoon F434398 This image is the entrypoint for the 50m-ctf. It doesn't look like much at first, but one can clearly see that there's a lot of binary digits in the background. The immediate obstacle to trying to decode it is we don't know how many...