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This avoids the stack smashing detection because the checking of the stack cookie/canary happens only at the function's prologue. Since the challenge you posted requires smashing something on the stack directly that is used in a logic check in the same function, the canary isn't checked by the time you receive your shell. The canary mainly prevents against ...


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After further investigation it turned out that when constructing the payload using Python's print statement one 0a newline was added right before the shellcode and after the last NOP resulting in unexcutable code. I figured this out by experimenting with the book's C program which created the exact same payload but worked when I ran it. After using Perl's ...



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