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I have been working on finding an overflow in WordPad and I was able to run an exception with an undefined behavior (my point of view).

I am using x64dbg (I am not a pro x64dbg) and it shows unexpected HRESULT and almost all registers filled with random values (they don't get filled when a non-corrupted file is loaded).

I am new to x64dbg — how would I go saying this is vulnerable? How do I analyze the exception and the behavior? How do I exploit it?

I have so many questions. Please help. The memory dump is too big, so it is impossible to identify anything. What steps should I follow? Sometimes shows unexpected HRESULT on R8 register as well.

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  • Please don’t use “x64” as abbreviation of x64dbg, it’s a separate term on its own.
    – Igor Skochinsky ♦
    Jun 3, 2020 at 18:43
  • @IgorSkochinsky why do registers get random values even tho this is not an overflow ? How do I analyze the exception
    – turmuka
    Jun 4, 2020 at 10:36
  • why do you think these values are random?
    – morsisko
    Jul 4, 2020 at 21:38
  • apparently they are not. but why @morsisko
    – turmuka
    Jul 11, 2020 at 1:32

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The exception shown in status bar (CPP_EH_EXCEPTION) is a special exception code used to implement C++ exceptions (throw/catch) and usually does not indicate a bug or vulnerability. In most cases it can be passed to the program which expects it and will handle it.

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