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whatamp;#39;s up everybody my name is John Hammond and welcome back to some more Pecos CTF 2017 this is level 2 in the binary exploitation category challenge is called flag say one for I think 75 points 80 points nice it says I heard you like flag so now you can make your own exhilarating use at the binary given here and the source code and connecting with a netcat command for a host and a port the hint here is system will run exactly what the program gives it so with a little bit more context Iamp;#39;ve already got all this stuff downloaded I just again W get it into the current directory Iamp;#39;m in and then we can go ahead and check out the source code for this binary dot C so it defines a bunch of kind of set constants here gives us a string kind of ASCII art of say if a flag picture and it says command base being a string with bin echo and then a % s so as we saw in the previous video and as we just kind of come to learn within C and programming is that this is a format spec