Sunday, 10 November 2013

Don't forget to return! Scripting challenge.

I found this quite an amusing scripting challenge. If you get stuck feel free to ask for a hint. If you post your answer I will post mine! (Don't go OTT! If you are above 100 lines ye gone too farr)




And i'm not talking about guessing EVERY combination here..

[adam@localhost code]$ time ./strcmp_bruter.py
made it.
Tell me and I forget, teach me and I may remember, involve me and I learn.

real    0m0.111s
user    0m0.043s
sys    0m0.050s
[adam@localhost code]$
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3 comments:

  1. Unknown20 November 2013 at 15:37

    Adam,

    I'm interested in this as I like a good challenge but I'm not sure which way to go with this. I compiled this in c but it would not compile in c++ due to the return on line #16. Obviously that is part of the problem. I played with nm, objdump, and a few other stabs at this. My wrapper was written in python but I was unsure if I should load up ctypes and attack the problem from that angle. I do know that `strings` was effective at peeking into the compiled program but it was obviously not the intended way to solve this.

    Any hints or pointers would be appreciated.

    ReplyDelete
    Replies
    1. A20 November 2013 at 20:39

      Hint:

      http://pastebin.com/raw.php?i=khXhYHhX

      You don't need any reversing tools for this, just a program wrapper!

      p.s. If you just get 0 back, then It could be your (os|kernel|gcc).

      p.p.s better hint http://pastebin.com/raw.php?i=wJSR1ZPL

      Delete
    2. Unknown23 November 2013 at 16:34

      Adam,

      Success! Right around 20 lines of code.

      ./challenge.py
      made it.
      Tell me and I forget, teach me and I may remember, involve me and I learn.

      Please continue the blog as I have enjoyed them.

      Delete

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