CVE-2022-31570
📋 TL;DR
This vulnerability allows attackers to read arbitrary files on the server through absolute path traversal in the adriankoczuruek/ceneo-web-scrapper repository. It affects any system running this web scraper software with the vulnerable code. Attackers can exploit this to access sensitive files like configuration files, credentials, or system files.
💻 Affected Systems
- adriankoczuruek/ceneo-web-scrapper
📦 What is this software?
Ceneo Web Scrapper by Ceneo Web Scrapper Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive files like SSH keys, database credentials, or configuration files containing secrets, potentially leading to lateral movement or data exfiltration.
Likely Case
Unauthorized access to sensitive application files, configuration data, or system files that could contain credentials or other sensitive information.
If Mitigated
Limited impact with proper file system permissions and network segmentation, restricting access to critical system files.
🎯 Exploit Status
The vulnerability is straightforward to exploit by manipulating file paths in requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2021-03-15
Vendor Advisory: https://github.com/github/securitylab/issues/669
Restart Required: Yes
Instructions:
1. Update to the latest version of ceneo-web-scrapper repository
2. Verify the Flask send_file function now includes proper path validation
3. Restart the application service
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to sanitize and restrict file paths before passing to send_file function
# Add path validation in Flask route
from werkzeug.utils import secure_filename
import os
@app.route('/download')
def download_file():
filename = secure_filename(request.args.get('file'))
safe_path = os.path.join(app.config['UPLOAD_FOLDER'], filename)
return send_file(safe_path)
Restrict File System Access
linuxRun application with minimal file system permissions and use chroot/jail environments
# Run as non-root user
sudo -u appuser python app.py
# Use container with restricted volumes
docker run -v /safe/path:/app/data:ro your-app
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns like '../' and absolute paths
- Network segmentation to isolate vulnerable systems and restrict access to sensitive file servers
🔍 How to Verify
Check if Vulnerable:
Check if your version is from before 2021-03-15 and inspect Flask routes using send_file without proper path validationCheck Version:
Check repository commit history or version metadata in the applicationVerify Fix Applied:
Test that attempts to access files with absolute paths or directory traversal sequences return errors instead of file contents📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' sequences, absolute paths, or attempts to access sensitive file paths
- Unusual file access patterns from web application logs
Network Indicators:
- HTTP requests with suspicious file path parameters
- Traffic patterns showing repeated attempts to access different file paths
SIEM Query:
source="web_logs" AND (url="*../*" OR url="*/etc/*" OR url="*/proc/*" OR url="*/root/*")