[SOLVED] Csc748 extra credit- the morris worm

Description:
On our Labs CTF site you will find three new challenges under the “Extra Credit” category. Each is built from a (very slightly) modified version of this source code. Each contains the same vulnerability. The only difference is their compile options:
• Morris Worm (easy) is built much like the original program in 1988 would have been; simple, with no exploit mitigations at all.
• Morris Worm (medium) adds NX protection which did not exist at the time. This will make writing an exploit more difficult, but not impossible.
• Morris Worm (hard) Is compiled 64-bit, and includes NX, but is missing a few key components you might have wanted to use in your ROP chain. Can you find creative alternative solutions?
Put yourself in the shoes of Robert Morris and try to write exploits capable of running code on the remote machine for each. I’ll give 3 points extra credit for each solve, and 1 more bonus point if you solve all three, meaning that you can earn up to 3+3+3+1 = 10 points total here, the equivalent of a full assignment!
Don’t forget to submit the flags!
Deliverables:
• For each of the labs listed above, please turn in to the dropbox… ◦ Your well documented script which solves the challenge ◦ A screenshot of it running, showing that it works.