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Override is last ISO that will have you search for faults present in the protected binaries, and re-build these binaries depending on their behavior.

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Override

If you thought Rainfall was easy, here’s a more daunting challenge. Override is last ISO that will have you search for faults present in the protected binaries, and re-build these binaries depending on their behavior.

Ressources (Important before start the project) :

subject link
How Stack works link
Assembly Basics link
get buffer offset link

Flags:

Name Flag
Flag0 just comparing numbers level00
Flag1 shellcode uSq2ehEGT6c9S24zbshexZQBXUGrncxn5sD5QfGL
Flag2 GOT PwBLgNa8p8MTKW57S7zxVAQCxnCpV8JqTTs9XEBv
Flag3 debug logic Hh74RPnuQ9sa5JAEXgNWCqz7sXGnh5J5M9KfPg3H
Flag4 buffer overflow kgv3tkEb9h2mLkRsPkXRfc2mHbjMxQzvb2FrgKkf
Flag5 got + shell env 3v8QLcN5SAhPaZZfEasfmXdwyR59ktDEMAwHF3aN
Flag6 decode serial hashing algo h4GtNnaMs2kZFN92ymTr2DcJHAzMfzLW25Ep59mq
Flag7 intiger overflow GbcPDRgsFK77LNnnuh7QyFYA2942Gp8yKj9KrWD8
Flag8 symbol link 7WJ6jFBzrcjEYXudxnM3kdW7n3qyxR6tk2xGrkSC
Flag9 buffer overflow fjAwpJNs2vvkFLRebEvAQ2hFZ4uQBWfHRsP62d8S
end ___ j4AunAPDXaJxxWjYEUxpanmvSgRDV3tpA5BEaBuE

GDB commands cheats :

  • switch to intel + enable cursor scroll + set hook-stop with general details(asm, info frame, info registers, 40 address of the stack $ESP)
    set disassembly-flavor intel
    set height 0
    define hook-stop
    disass
    echo ------------------------- [FRAME] -------------------------\n
    info frame
    echo ------------------------- [REGISTERS] -------------------------\n
    info reg
    echo ------------------------- [ESP] -------------------------\n
    x/10wx $esp
    end
    
  • .gdbinit
    set disassembly-flavor intel
    set height 0
    info fun
    

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Override is last ISO that will have you search for faults present in the protected binaries, and re-build these binaries depending on their behavior.

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