CVE-2022-31509
📋 TL;DR
This vulnerability allows attackers to perform absolute path traversal attacks in the iedadata/usap-dc-website repository, enabling unauthorized file access. It affects users running versions through 1.0.1 of this GitHub repository's web application. The flaw exists due to unsafe usage of Flask's send_file function without proper path validation.
💻 Affected Systems
- iedadata/usap-dc-website
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive server files including configuration files, credentials, and system files, potentially leading to complete system compromise.
Likely Case
Unauthorized access to application files and potentially sensitive data stored on the server.
If Mitigated
Limited impact with proper file system permissions and network segmentation in place.
🎯 Exploit Status
Path traversal vulnerabilities are well-understood and easily exploitable with basic HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.0.1
Vendor Advisory: https://github.com/github/securitylab/issues/669#issuecomment-1117265726
Restart Required: Yes
Instructions:
1. Update to the latest version of iedadata/usap-dc-website repository. 2. Replace vulnerable send_file usage with secure implementation. 3. Restart the Flask application.
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to sanitize file paths before passing to send_file function.
Restrict File System Access
allConfigure Flask application to run with minimal file system permissions.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns
- Isolate the vulnerable application in a restricted network segment
🔍 How to Verify
Check if Vulnerable:
Review Flask application code for unsafe send_file usage without path validation.Check Version:
Check repository version in deployment configuration or package metadata.Verify Fix Applied:
Test that path traversal attempts (e.g., ../../../etc/passwd) are properly blocked.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing ../ patterns
- Failed file access attempts to system directories
Network Indicators:
- HTTP requests with unusual path traversal sequences
SIEM Query:
source="web_server" AND (uri="*../*" OR uri="*..\\*")