CTF-practice-evening:2014-03-24

CTF-practice-evening:2014-03-24
Date	2014/03/24
Time
Location	ACTA
Type	Workshop
Contact	Melanie

Capture The Flag evening - Part 11

• 24 March, 2014 - 7 PM
• Please bring along a laptop with you!!!

General CTF Info

• See the page for the Ctf-evenings
• Link to the Tech Inc Challenge Website Scoreboard

Walkthrough: Minibomb

• Brainsmoke is explaining how he solved the challenge 'Minibomb' during the Codegate CTF
• Minibomb is a small setuid binary
  • This is probably a handmade binary written in assembler, Linux ELF, 32 bit
  • You can see the ELF header if you use file or hexdump
    • For more information about the ELF header (including the binary entry point, memory pages being loaded, executable text, etc..), you can use readelf
  • Objdump allows us to disassemble the binary
  • It's a static binary - there's no dynamic loader
    • Dynamic binaries have an interpreter section, with more LD-* things that need to be resolved
    • The kernel needs to tell where the binary starts

Next CTF Competition

• We are having a look at:https://ctftime.org/event/list/upcoming

Cryptanalysis

http://www.overthewire.org/wargames/krypton/krypton0.shtml