Solving ‘int3rupted’ from defcon 2015 qualifier with r2

In previous blog posts we’ve shown how radare2 can be useful for exploiting “baby” level challenges. Let’s show how we can use it to find the bug and ultimately exploit a 5 point pwning challenge from the DEFCON 2015 qualifiers! You can find the binary here if you want to play along at home. To start with, in the challenge, we were just given a hostname and ip address, no binary was given!
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