Black Hole Sun, won’t you come
and put sunshine in my bag
I’m useless, but not for long
so whatcha whatcha whatcha want?
nc 18.104.22.168 12345
The challenge binary asks for some input, then prints a message.
Gimme that good stuff: asdfasdf
Survey Says! ��a_n\a_n\����������
With some static analysis we can see that the program first mangles the input in a way that we’d like not to reverse and then checks it against a fixed string. If we can find the correct input we will get the flag.
This seems a good use case for angr. We can search for a
state were stdout contains
That's right!, then print the contents of stdin.
$ python solve.py
Great! Now let’s get ourselves a flag!
$ echo everybodyrockyourbody | nc 22.214.171.124 12345
Gimme that good stuff: Survey Says! jmt_j]tm`q`t_j]mpjtf^