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To quickly install `construct==2.9.45` please use: 13 | `pip2 -m install construct==2.9.45 --user` 14 | 15 | ### Currently supported EtherNet/IP protocol stacks 16 | * RTAutomation EtherNet/IP Stack 17 | * CPPPO (e.g. conpot) EtherNet/IP Stack 18 | * OpENer Stack EtherNet/IP Stack 19 | * Rockwell 1756-EN2TR/A EtherNet/IP Stack 20 | * Rockwell 1756-L81E/B EtherNet/IP Stack 21 | * Rockwell RSLinx EtherNet/IP Stack 22 | * Rockwell LC 20/50 EtherNet/IP Stack 23 | * Rockwell 1763/1766 EtherNet/IP Stack 24 | * Rockwell 1769 EtherNet/IP Stack 25 | * Rockwell SoftLogix5800 Emulator EtherNet/IP Stack 26 | * Rockwell PanelView Plus EtherNet/IP Stack 27 | * Rockwell SLC/PLC5 EtherNet/IP Stack 28 | 29 | ### How can the tool be used 30 | This can be used both for security research and as part of an internal investigation to quickly scan many devices to retrieve their EtherNet/IP protocol stack. More reasons to use the tool: 31 | * Vulnerability research 32 | * Honeypot detection (for example [conpot](https://github.com/mushorg/conpot) which uses [CPPPO](https://github.com/pjkundert/cpppo) behind the scenes, and [can easily get detected](https://www.shodan.io/search?query=Serial+number%3A+0x006c061a)) 33 | * Scan which devices are affected by some vulnerability in one of the EtherNet/IP protocol stacks* 34 | 35 | ### How the tool works 36 | This tool performs behavioral profiling by breaking down the EtherNet/IP and CIP protocols to specific properties and attributes, which later creates a unique signature for the ENIP stack in use based on all the collected parameters. Supersetting all the unique implementation hints gives the true identity of the ENIP stack being used. A parameter can be any delicate attribute of the protocol and the implementation, for example, an attribute that determines whether a certain feature of the ENIP protocol is currently supported. Scanning two different devices that use the same core ENIP stack (e.g. an SDK purchased from the same vendor) will result with the same unique signature. 37 | 38 | ### How Claroty uses this tool 39 | This tool enables Claroty researchers to identify various classes of ENIP stacks and group similar implementations of different ENIP stacks. For example, Claroty researchers identified the unique signature generated by devices running [RTA’s ENIP stack](https://www.claroty.com/2020/11/17/blog-research-rta-enip-stack-vulnerability/). With that, they started to scan many ENIP-compatible devices in order to detect all potentially affected devices. Eventually, through this tool, Claroty researchers were able to scan 290 ***unique*** ENIP-compatible devices, which reveled 32 unique ENIP stacks. 40 | 41 | Eventually, out of the 290 unique devices scaned, eleven devices were found to be running RTA’s ENIP stack in products from six unique vendors and appropriate actions were taken accordingly (disclosure process). 42 | 43 | ### Output Example 44 | ```bash 45 | ==============Device================ 46 | [!] 192.168.1.200: 1756-ENBT/A (vendor:1 type: 12, v6.4) 47 | ==================================== 48 | 49 | ==============Tests=============== 50 | [ X ]: ENIP Register Session Number Sequential (Used value: 0x1) 51 | [ X ]: ENIP Register Session Number Sequential (Used value: 0x10) 52 | [ V ]: ENIP Register Session Number Sequential (Used value: 0x100) 53 | [ X ]: ENIP Register Session Number Sequential (Used value: 0x1000) 54 | [ X ]: ENIP Register Session Number Sequential (Used value: 0x10000) 55 | [ X ]: ENIP Can Register Session with Bad Options (Used value: 1) 56 | [ X ]: ENIP Can Register Session with Bad Length (Used value: 3) 57 | [ V ]: ENIP Is List Targets Supported 58 | [ V ]: ENIP List Services Protocol Version is 1 59 | [ X ]: ENIP List Services Name is "Communications \x00" (with space) 60 | [ X ]: ENIP List Services Name is "Communications\x00" (with single null (bug)) 61 | [ V ]: ENIP List Services Name is "Communications\x00\x00" (with nulls) 62 | [ X ]: ENIP List Services Name is "COMMUNICATIONS\x00\x00" (upper with nulls) 63 | [ V ]: ENIP List Services Name Capability Flags Reserved Bit Are Empty 64 | [ V ]: CIP Forward Open is supported 65 | [ V ]: CIP Forward Open allows multiple requests for connection id 0 66 | [ X ]: CIP Forward Open is O2T Sequential by 1 67 | [ V ]: CIP Forward Open is T2O zero 68 | [ V ]: CIP Forward Open can open with bad connection flags 69 | ==================================== 70 | 71 | ==============Results=============== 72 | [!] EtherNet/IP & CIP Stack: 1756-EN2TR/A (sig: '0010000110010111011') 73 | ==================================== 74 | ``` 75 | 76 | ### Supported attributes 77 | Based on our research, we are collecting the following boolean flags during a scan: 78 | * ENIP Register Session Number Sequential (0x1, 0x10, 0x100, 0x1000, 0x10000) 79 | * ENIP Can Register Session with Bad Options (Used value: 1) 80 | * ENIP Can Register Session with Bad Length (Used value: 3) 81 | * ENIP Is List Targets Supported 82 | * ENIP List Services Protocol Version is 1 83 | * ENIP List Services Name ('Communications' variation) 84 | * ENIP List Services Name Capability Flags Reserved Bit Are Empty 85 | * CIP Forward Open is supported 86 | * CIP Forward Open allows multiple requests for connection id 0 87 | * CIP Forward Open is O2T Sequential by 1 88 | * CIP Forward Open is T2O zero 89 | * CIP Forward Open can open with bad connection flags 90 | 91 | # More Resources 92 | - [RTA ENIP Stack Vulnerability Poses Risk to ICS Devices](https://www.claroty.com/2020/11/17/blog-research-rta-enip-stack-vulnerability/) 93 | - [Fuzzing and PR’ing: How We Found Bugs in a Popular Third-Party EtherNet/IP Protocol Stack](https://claroty.com/2021/04/15/blog-research-fuzzing-and-pring/) 94 | -------------------------------------------------------------------------------- /demo.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/claroty/enip-stack-detector/3dcb8e8dd722f19f9e26d9c21f8a6fca46401627/demo.gif -------------------------------------------------------------------------------- /enip_stack_detector.py: -------------------------------------------------------------------------------- 1 | import socket 2 | import struct 3 | import sys 4 | from construct import * # construct==2.9.45 5 | 6 | if len(sys.argv) != 2: 7 | print("Usage: {} IP_ADDR".format(sys.argv[0])) 8 | sys.exit(1) 9 | HOST_IP = sys.argv[1] 10 | HOST_PORT = 44818 11 | 12 | ################### 13 | ### ENIP Header ### 14 | ################### 15 | # Commands 16 | ENIP_CMD_NOP = 0x0000 17 | ENIP_CMD_LIST_TARGETS = 0x0001 18 | ENIP_CMD_LISTSERVICES = 0x0004 19 | ENIP_CMD_LISTIDENTITY = 0x0063 20 | ENIP_CMD_LISTINTERFACES = 0x0064 21 | ENIP_CMD_REGISTERSESSION = 0x0065 # TCP only 22 | ENIP_CMD_UNREGISTERSESSION = 0x0066 # TCP only 23 | ENIP_CMD_SENDRRDATA = 0x006F # TCP only 24 | ENIP_CMD_SENDUNITDATA = 0x0070 # TCP only; PCCC 25 | ENIP_CMD_INDICATESTATUS = 0x0072 26 | ENIP_CMD_CANCEL = 0x0073 27 | 28 | ######################## 29 | ### Command Specific ### 30 | ######################## 31 | # Command Specific (type ID) 32 | TYPE_ID_NULL = 0x0000 33 | TYPE_ID_LIST_IDENT_RESPONSE = 0x000C 34 | TYPE_ID_CONNECTION_BASED = 0x00A1 35 | TYPE_ID_CONNECTED_TRANSPORT_PACKET = 0x00B1 36 | TYPE_ID_UNCONNECTED_MESSAGE = 0x00B2 37 | TYPE_ID_LISTSERVICES_RESPONSE = 0x0100 38 | TYPE_ID_SOCKADDR_INFO_ORIG_TARGET = 0x8000 39 | TYPE_ID_SOCKADDR_INFO_TARGET_ORIG = 0x8001 40 | TYPE_ID_SEQUENCED_ADDRESS = 0x8002 41 | TYPE_ID_CIP_SECURITY_INFORMATION = 0x0086 42 | 43 | ######################## 44 | ##### List Identity #### 45 | ######################## 46 | # status is a bit encoded word 47 | LIST_IDENT_STATUS_OWNED = 0x0001 48 | LIST_IDENT_STATUS_CONFIGURED = 0x0004 49 | LIST_IDENT_STATUS_EXTENDED_DEVICE_STATUS = 0x00F0 50 | LIST_IDENT_STATUS_MINOR_RECOVERABLE_FAULT = 0x0100 51 | LIST_IDENT_STATUS_MINOR_UNRECOVERABLE_FAULT = 0x0200 52 | LIST_IDENT_STATUS_MAJOR_RECOVERABLE_FAULT = 0x0400 53 | LIST_IDENT_STATUS_MAJOR_UNRECOVERABLE_FAULT = 0x0800 54 | LIST_IDENT_STATUS_EXTENDED_DEVICE_STATUS2 = 0xF000 55 | # states 56 | LIST_IDENT_STATE_NONEXISTENT = 0x00 57 | LIST_IDENT_STATE_SELF_TESTING = 0x01 58 | LIST_IDENT_STATE_STANDBY = 0x02 59 | LIST_IDENT_STATE_OPERATIONAL = 0x03 60 | LIST_IDENT_STATE_RECOVERABLE_FAULT = 0x04 61 | LIST_IDENT_STATE_UNRECOVERABLE_FAULT = 0x05 62 | LIST_IDENT_STATE_DEFAULT = 0xFF 63 | 64 | 65 | ########################################## 66 | ################## DATA ################## 67 | ########################################## 68 | IP_ADDRESS_V4 = ExprAdapter(Byte[4], 69 | decoder = lambda obj,ctx: "{0}.{1}.{2}.{3}".format(*obj), 70 | encoder = lambda obj,ctx: [int(x) for x in obj.split(".")], 71 | ) 72 | 73 | # b"\x63\x00\x33\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x0c\x00\x2d\x00\x01\x00\x00\x02\xaf\x12\x0a\x01\x1e\x01\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x0c\x00\x3a\x00\x05\x01\x60\x00\x9d\x04\xc0\x9c\x0b\x31\x37\x35\x36\x2d\x45\x4e\x42\x54\x2f\x41\x03" 74 | LIST_IDENTITY_REPLY = Struct( 75 | "vendor_id" / Int16ul, 76 | "device_type" / Int16ul, 77 | "product_code" / Int16ul, 78 | "major_revision" / Byte, 79 | "minor_revision" / Byte, 80 | "status" / Int16ul, 81 | "serial" / Int32ul, 82 | "product_name" / PascalString(Byte, "utf8"), 83 | #"state" / Byte, 84 | ) 85 | 86 | ########################################## 87 | ########## SPECIFIC COMMANDS ############# 88 | ########################################## 89 | ENIP_SOCKET_ADDRESS = Struct ( 90 | "sin_family" / Int16ub, 91 | "sin_port" / Int16ub, 92 | "sin_addr" / IP_ADDRESS_V4, 93 | "sin_zero" / Int64ub, 94 | ) 95 | 96 | ENIP_COMMAND_SPECIFIC = Struct( 97 | "items" / PrefixedArray(Int16ul, Struct( 98 | "type_id" / Int16ul, 99 | "data" / Prefixed(Int16ul, Switch(this.type_id, 100 | { 101 | TYPE_ID_NULL: Struct(), 102 | TYPE_ID_CONNECTION_BASED: Struct("connection_id" / Int32ul), 103 | TYPE_ID_CONNECTED_TRANSPORT_PACKET: Struct("sequence" / Int16ul, "data" / GreedyBytes), 104 | TYPE_ID_UNCONNECTED_MESSAGE: Struct("data" / GreedyBytes), 105 | TYPE_ID_LIST_IDENT_RESPONSE: Struct("version" / Int16ul, "sender_context" / ENIP_SOCKET_ADDRESS, "list_identity" / Embedded(LIST_IDENTITY_REPLY)), 106 | TYPE_ID_LISTSERVICES_RESPONSE: Struct("protocol_version" / Int16ul, "capability_flags" / Int16ul, "name" / GreedyBytes), 107 | })) 108 | ))) 109 | 110 | 111 | ENIP_UDP_COMMAND_SPECIFIC_LIST_IDENTITY = Struct( 112 | "command_specific" / ENIP_COMMAND_SPECIFIC, 113 | "version" / Int16ul, 114 | "sender_context" / ENIP_SOCKET_ADDRESS, 115 | "list_identity" / Embedded(LIST_IDENTITY_REPLY) 116 | ) 117 | ENIP_TCP_COMMAND_SPECIFIC_RR_DATA = Struct( 118 | "interface_handle" / Default(Int32ul, 0), 119 | "timeout" / Default(Int16ul, 0xff), 120 | "command_specific" / ENIP_COMMAND_SPECIFIC, 121 | ) 122 | ENIP_TCP_COMMAND_SPECIFIC_UNIT_DATA = ENIP_TCP_COMMAND_SPECIFIC_RR_DATA 123 | 124 | ENIP_TCP_COMMAND_SPECIFIC_REGISTER_SESSION = Struct( 125 | "protocol_version" / Default(Int16ul, 1), 126 | "option" / Default(Int16ul, 0), 127 | "more_data" / Default(GreedyBytes, b"") 128 | ) 129 | ########################################## 130 | ################# HEADERS ############### 131 | ########################################## 132 | ENIP_HEADER = Struct( 133 | "command" / Int16ul, 134 | "length" / Default(Int16ul, 0), 135 | "session" / Default(Int32ul, 0), 136 | "status" / Default(Int32ul, 0), 137 | "sender_context" / Default(Int64ul, 0), 138 | "options" / Default(Int32ul, 0), 139 | "more_data" / Bytes(this.length) 140 | ) 141 | 142 | ENIP_HEADER_SPECIAL = Struct( 143 | "command" / Int16ul, 144 | "length" / Default(Int16ul, 0), 145 | "session" / Default(Int32ul, 0), 146 | "status" / Default(Int32ul, 0), 147 | "sender_context" / Default(Int64ul, 0), 148 | "options" / Default(Int32ul, 0), 149 | "more_data" / GreedyBytes 150 | ) 151 | 152 | 153 | 154 | ########################################## 155 | ################### Helpers ############## 156 | ########################################## 157 | def h2b(d): 158 | return d.replace(" ", "").decode("hex") 159 | 160 | def size2b(d, in_words=False): 161 | data_len = len(d)/2 if in_words else len(d) 162 | return struct.pack("