In this post I’ll show you how to port the ret2csu technique on ARM binaries. This technique allows full ASLR bypass using ROP gadgets inside the binary only. We will see that it also turns out to be a very effective technique to easily chain ROP gadgets.
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The box was rated as insane and required us to grab a client and information from an anonymous FTP server, modify the Java client to exploit lacking server side validation, exploit Java deserialization, and exploit and careless administrator who periodically pulls log archives from within docker containers and extracts them. All in all this box was quite entertaining but not necessarily insane. Rather it mostly was just time-consuming.