new module ntlm reflexion

Author: Mauriceter

nxc/modules/CVE-2025-33073.py

@@ -0,0 +1,96 @@
+import time
+from impacket.dcerpc.v5 import transport, rrp
+from impacket.dcerpc.v5.rpcrt import RPC_C_AUTHN_GSS_NEGOTIATE
+from impacket.smbconnection import SessionError
+
+
+class NXCModule:
+    # https://www.synacktiv.com/en/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025
+    name = "CVE-2025-33073"
+    description = "Attempt to check if the OS is vulnerable to CVE-2025-33073"
+    supported_protocols = ["smb"]
+    opsec_safe = True
+    multiple_hosts = True
+
+    # Reference table from MSRC report
+    # https://msrc.microsoft.com/update-guide/fr-FRS/vulnerability/CVE-2025-33073
+    
+    MSRC_PATCHES = {    # key = (major, minor, build), value = minimum patched UBR
+        (6, 3, 9600): 22620,      # Windows Server 2012 R2
+        (6, 2, 9200): 25522,      # Windows Server 2012
+        (6, 1, 7601): 27769,      # Windows Server 2008 R2 SP1
+        (6, 0, 6003): 23351,      # Windows Server 2008 SP2
+        (10, 0, 14393): 8148,     # Windows Server 2016
+        (10, 0, 17763): 7434,     # Windows Server 2019 / Win10 1809
+        (10, 0, 20348): 3807,     # Windows Server 2022
+        (10, 0, 19044): 5965,     # Windows 10 21H2
+        (10, 0, 22621): 5472,     # Windows 11 22H2
+    }
+
+    def __init__(self, context=None, module_options=None):
+        self.context = context
+        self.module_options = module_options
+
+    def options(self, context, module_options):
+        """No options"""
+
+    def is_vulnerable(self, major, minor, build, ubr):
+        key = (major, minor, build)
+        min_patched_ubr = self.MSRC_PATCHES.get(key)
+        if min_patched_ubr is None:
+            return None  # Unknown product
+        if ubr is None:
+            return None
+        return ubr < min_patched_ubr
+
+    def on_login(self, context, connection):
+        self.context = context
+        self.connection = connection
+        if not connection.conn.isSigningRequired():  # Not vulnerable if SMB signing is enabled
+            self.trigger_winreg(connection.conn, context)
+            rpc = transport.DCERPCTransportFactory(r"ncacn_np:445[\pipe\winreg]")
+            rpc.set_smb_connection(connection.conn)
+            if connection.kerberos:
+                rpc.set_kerberos(connection.kerberos, kdcHost=connection.kdcHost)
+            dce = rpc.get_dce_rpc()
+            if connection.kerberos:
+                dce.set_auth_type(RPC_C_AUTHN_GSS_NEGOTIATE)  
+            try:
+                dce.connect()
+                dce.bind(rrp.MSRPC_UUID_RRP)
+                # Reading UBR from registry
+                hRootKey = rrp.hOpenLocalMachine(dce)["phKey"]
+                hKey = rrp.hBaseRegOpenKey(dce, hRootKey, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion")["phkResult"]
+                ubr = rrp.hBaseRegQueryValue(dce, hKey, "UBR")[1]
+                version_str = f"{connection.server_os_major}.{connection.server_os_minor}.{connection.server_os_build}.{ubr}" if ubr else None
+                dce.disconnect()
+                if not version_str:
+                    self.context.log.info("Could not determine OS version from registry")
+                    return
+                vuln = self.is_vulnerable(connection.server_os_major, connection.server_os_minor, connection.server_os_build, ubr)
+                if vuln:
+                    context.log.highlight(f"VULNERABLE to {self.name}! {connection.server_os} ({version_str})")
+            except SessionError as e:
+                if "STATUS_OBJECT_NAME_NOT_FOUND" in str(e):
+                    self.context.log.info(f"RemoteRegistry is probably deactivated: {e}")
+                else:
+                    self.context.log.debug(f"Unexpected error: {e}")
+                    
+    def trigger_winreg(self, connection, context):
+        # Original idea from https://twitter.com/splinter_code/status/1715876413474025704
+        # Basically triggers the RemoteRegistry to start without admin privs
+        tid = connection.connectTree("IPC$")
+        try:
+            connection.openFile(
+                tid,
+                r"\winreg",
+                0x12019F,
+                creationOption=0x40,
+                fileAttributes=0x80,
+            )
+        except SessionError as e:
+            # STATUS_PIPE_NOT_AVAILABLE error is expected
+            context.log.debug(str(e))
+        # Give remote registry time to start
+        time.sleep(1)
+

tests/e2e_commands.txt

@@ -131,6 +131,7 @@ netexec smb TARGET_HOST -u LOGIN_USERNAME -p LOGIN_PASSWORD KERBEROS -M webdav -
 netexec smb TARGET_HOST -u LOGIN_USERNAME -p LOGIN_PASSWORD KERBEROS -M wifi
 netexec smb TARGET_HOST -u LOGIN_USERNAME -p LOGIN_PASSWORD KERBEROS -M winscp
 netexec smb TARGET_HOST -u LOGIN_USERNAME -p LOGIN_PASSWORD KERBEROS -M zerologon
+netexec smb TARGET_HOST -u LOGIN_USERNAME -p LOGIN_PASSWORD KERBEROS -M CVE-2025-33073
 # test for multiple modules at once
 netexec smb TARGET_HOST -u LOGIN_USERNAME -p LOGIN_PASSWORD KERBEROS -M spooler -M petitpotam -M zerologon -M nopac -M dfscoerce -M enum_av -M enum_dns -M gpp_autologin -M gpp_password -M lsassy -M impersonate -M install_elevated -M ioxidresolver -M ms17-010 -M ntlmv1 -M runasppl -M shadowcoerce -M uac -M webdav -M wifi
 ##### SMB Anonymous Auth