Posts Tagged ‘asm’
Exploit writing tutorial part 9 : Introduction to Win32 shellcoding
Author: Peter Van Eeckhoutte
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Over the last couple of months, I have written a set of tutorials about building exploits that target the Windows stack. One of the primary goals of anyone writing an exploit is to modify the normal execution flow of the application and trigger the application to run arbitrary code… code that is injected by the attacker and that could allow the attacker to take control of the computer running the application. This type of code is often called “shellcode”, because one of the most used targets of running arbitrary code is to allow an attacker to get access to a remote shell / command prompt on the host, which will allow him/her to take further control of the host. While this type of shellcode is still used in a lot of cases, tools such as Metasploit have …
Posted in 001_Security, Exploit Writing Tutorials | 
Tags: asm, assembly, bad chars, beta3, bits 32, bytecode, calc, charset limitation, decoder, encoder, ExitFunc, ExitProcess, ExitThread, exploit, exploit writing, find function, fstenv, fstenv_mov, GetProcess, hash, intel, introduction win, kernel32, loadlibraryA, loopd, MessageBoxA, metasploit, nasm, null bytes, opcode, part introduction, peb, pvefindaddr, pvereadbin.pl, pvewritebin.pl, seh, shellcode, shikata_ga_nai, skylined, topstack, tutorial part, user32, w32-testival, win shellcoding, win32, WinExec, writing, writing tutorial, x86 | 
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Exploit writing tutorial part 8 : Win32 Egg Hunting
Author: Peter Van Eeckhoutte
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Introduction Easter is still far away, so this is probably the right time to talk about ways to hunting for eggs (so you would be prepared when the easter bunny brings you another 0day vulnerability) In the first parts of this exploit writing tutorial series, we have talked about stack based overflows and how they can lead to arbitrary code execution. In all of the exploits that we have built so far, the location of where the shellcode is placed is more or less static and/or could be referenced by using a register (instead of a hardcoded stack address), taking care of stability and reliability. In some parts of the series, I have talked about various techniques to jump to shellcode, including techniques that would use one or more trampolines to get to the shellcode. In …
Posted in 001_Security, Exploit Writing Tutorials, Exploits |
Tags: alpha2, alpha3, alphanumeric, asm, bad char, custom encoder, direct ret, egg, eip, encode, exploit, exploit writing, find shellcode, hunter, hunting, immunity, inject, isbadreadptr, marker, memory, metasploit, nasm, nop, ntdisplaystring, omelet, pvefindaddr, search, seh, shellcode, skape, skylined, small buffer, staged, tag, trampoline, tutorial, unicode, venetian, win32, win32_seh_omelet |
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