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dostackbufferoverflowgood's Issues

Application not responding to NC or fuzz scripts

Not sure if this is the right avenue to approach, but the application is not responding to netcat or fuzzing commands sent over from my kali machine. I've been using vulnserver.exe in the same VM that I'm running the dostackgood exe in, and that app had no issues for me. Any ideas as to what i could be missing?

Calc.exe

does this pdf pops up calc or have i been pwned before?

Margins

Love this tutorial and thank you so much for it. With that out of the way...

Why on gods green earth did you make the margins on the PDF so large? I use 2 page scrolling view for my big ol' monitors and your margins are literally insane.

I tried to produce a PDF from the markdown but it doesnt pull the images. Could you provide a PDF with no margins or very small margins?

Thank you :)

using "9eA8" in pattern_offset.rb does not work

Firstly I'd like to say I just went through your tutorial and I thought it was great! Thanks so much for creating it :)

I just want to point out a small issue that I found when running pattern_offset.rb to find the offset that overwrites the saved return pointer. If I use pattern_offset.rb with the raw address, ie

./pattern_offset.rb -q 39654138

Then I get the expected value of 146, but if I use the hexadecimal value that is mentioned in the tutorial (9eA8) ie:

./pattern_offset.rb -q 9eA8

I get this output:

[*] No exact matches, looking for likely candidates...

Interestingly if I reverse the order of the bytes, ie:

./pattern_offset.rb -q 8Ae9

I get the correct offset.

I assume this happens due to endian-ness shenanigans, (or possibly the way pattern_create.rb works has been changed since the tutorial was written) but it would be cool if the tutorial was updated with the correct value :) I am happy to create a PR to fix this if you would like

Typo in the function epilogue explanation

There are 3 bullets describing what the function epilogue does. The second bullet states:

  • POP EBP to restore the saved EBP value into the EBP register;

One of those EPB's should be ESP.

GREAT tutorial, by the way!

Question

Hey Justin,

Thanks for creating this amazing tutorial. I learned a lot!
I am trying to write the assembly instruction "sub esp,0x10" using the metasm_shell.rb you suggested but one of the hex numbers it outputs is a badchar for the binary. How can I replace the hex or how could I go around it?

I am trying to use a different opcode than 0x83.

Thank you!

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