CVE-2022-31576
📋 TL;DR
This vulnerability allows attackers to read arbitrary files on the server through absolute path traversal in the heidi-luong1109/shackerpanel repository. It affects any system running this GitHub repository's code through May 25, 2021. The vulnerability exists because Flask's send_file function is used without proper path validation.
💻 Affected Systems
- heidi-luong1109/shackerpanel
📦 What is this software?
Shackerpanel by Shackerpanel Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive files like /etc/passwd, SSH keys, database credentials, or application source code, potentially leading to remote code execution.
Likely Case
Unauthorized access to sensitive configuration files, source code, or user data stored on the server filesystem.
If Mitigated
Limited impact with proper file permissions, web server sandboxing, and network segmentation preventing access to critical system files.
🎯 Exploit Status
Path traversal vulnerabilities are trivial to exploit with simple HTTP requests using directory traversal sequences like ../../etc/passwd.
🛠️ 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 using Flask's safe_join or similar secure methods. 3. Update to a secure version if available from the repository maintainer.
🔧 Temporary Workarounds
Implement Path Validation Middleware
allAdd middleware to validate and sanitize file paths before passing to send_file
# Python code to implement path validation
from werkzeug.utils import safe_join
from flask import abort
@app.before_request
def validate_paths():
# Add path validation logic here
pass
Restrict File Access with Web Server
linuxConfigure web server (nginx/apache) to restrict file access to specific directories
# nginx example
location /static/ {
internal;
alias /var/www/app/static/;
}
🧯 If You Can't Patch
- Implement strict file system permissions to limit web user access to only necessary directories
- Deploy web application firewall (WAF) rules to block path traversal patterns
🔍 How to Verify
Check if Vulnerable:
Test by attempting to access files outside the intended directory using path traversal sequences like ../../etc/passwd in file download requests.Check Version:
Check repository commit history or version files to confirm if using code from before 2021-05-25.Verify Fix Applied:
Verify that path traversal attempts return 403/404 errors instead of file contents, and that only files within the intended directory are accessible.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing ../ sequences
- Access to unusual file paths from web endpoints
- Failed file access attempts to system directories
Network Indicators:
- HTTP requests with multiple directory traversal sequences
- Requests for known sensitive files like /etc/passwd, /etc/shadow
SIEM Query:
source="web_logs" AND (uri="*../*" OR uri="*/etc/*" OR uri="*/proc/*") AND response_code=200