bugtraq - Whitepaper - Writing small shellcode

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Message-ID: <20050919124706.7472B15F511@mail.ngssoftware.com>
Date: Mon, 19 Sep 2005 14:06:20 +0100
From: "Dafydd Stuttard" <daf@...software.com>
To: <bugtraq@...urityfocus.com>, <vuln-dev@...urityfocus.com>
Subject: Whitepaper - Writing small shellcode

I have written a short whitepaper describing techniques for writing small
shellcode. This can be downloaded from:

http://www.ngssoftware.com/papers/WritingSmallShellcode.pdf

Abstract
This paper describes an attempt to write Win32 shellcode that is as small as
possible, to perform a common task subject to reasonable constraints. The
solution presented implements a bindshell in 191 bytes of null-free code,
and outlines some general ideas for writing small shellcode.

Cheers,

Dafydd Stuttard
Principal Security Consultant
NGS Software Ltd