CVE-2022-31585
📋 TL;DR
This vulnerability allows attackers to perform absolute path traversal attacks in the umeshpatil-dev/Home__internet repository, enabling unauthorized file access. It affects users who deployed this GitHub repository's code before August 28, 2020. The vulnerability stems from unsafe use of Flask's send_file function without proper path validation.
💻 Affected Systems
- umeshpatil-dev/Home__internet repository
📦 What is this software?
Home Internet by Home Internet Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through arbitrary file read, potentially exposing sensitive configuration files, credentials, or enabling remote code execution.
Likely Case
Unauthorized access to sensitive files on the server, including configuration files, logs, and potentially user data.
If Mitigated
Limited impact with proper file system permissions and network segmentation restricting access to critical files.
🎯 Exploit Status
Path traversal vulnerabilities are well-understood and easily exploitable with basic HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
1. Remove or replace the vulnerable repository code. 2. Implement proper path validation in Flask send_file calls. 3. Use Flask's safe path handling functions.
🔧 Temporary Workarounds
Implement Path Validation
allAdd input validation to sanitize file paths before passing to send_file function
# Python code to validate paths
import os
from flask import send_file
def safe_send_file(path):
# Normalize and validate path
normalized = os.path.normpath(path)
if not normalized.startswith('/safe/directory/'):
return 'Invalid path', 400
return send_file(normalized)
Web Application Firewall Rules
linuxConfigure WAF to block path traversal patterns
# Example ModSecurity rule
SecRule REQUEST_URI "@contains ../" "id:1001,phase:2,deny,msg:'Path Traversal Attempt'"
🧯 If You Can't Patch
- Isolate the vulnerable application in a restricted network segment
- Implement strict file system permissions limiting application access to necessary directories only
🔍 How to Verify
Check if Vulnerable:
Review Flask code for send_file usage without proper path validation, specifically checking if user input directly controls file paths.Check Version:
Check repository commit history and deployment date against 2020-08-28 cutoffVerify Fix Applied:
Test with path traversal payloads (e.g., '../../etc/passwd') and verify they are blocked or sanitized.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' patterns
- Failed file access attempts outside expected directories
- Unusual file access patterns in application logs
Network Indicators:
- HTTP requests with encoded path traversal sequences (%2e%2e%2f)
- Multiple failed file access attempts from single source
SIEM Query:
source="web_logs" AND (uri="*../*" OR uri="*..%2f*" OR uri="*%2e%2e%2f*")