I am reading the PWK course book, the chapter of Linux Buffer Overflow:
Once the crossfire application is running, we can use the following Proof of Concept (PoC) code, found on the Exploit Database to crash the application.
... crash="\x41" * 4379 buffer = "\x11(setup sound " + crash + "\x90\x00#" ... s.send(buffer)
Once we run this script, the debugger spits out the following error message, which clearly indicates a buffer overflow condition in the setup sound command:
Then a window popup shows "... segmentation fault. The address 0x41414141 cannot be accessed". This is the expected result, because EIP has been overwritten by \x41\x41\x41\x41.
I understand those buffer overflow, EIP stuff. My question is just about this special string before \x41\x41...\x41:
What is this means? What means setup sound command?