CVE-2022-31525
📋 TL;DR
This vulnerability allows attackers to read arbitrary files on the server through absolute path traversal in the SummaLabs/DLS repository. It affects any system running vulnerable versions of this software, particularly web applications using the Flask framework with unsafe send_file implementation.
💻 Affected Systems
- SummaLabs/DLS repository
📦 What is this software?
Deep Learning Studio by Deep Learning Studio Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive files like /etc/passwd, SSH keys, configuration files, or database credentials, potentially leading to full system takeover.
Likely Case
Unauthorized access to sensitive files containing credentials, configuration data, or user information stored on the server.
If Mitigated
Limited impact with proper file system permissions and input validation preventing access to critical system files.
🎯 Exploit Status
Simple HTTP requests with crafted paths can exploit this vulnerability without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 0.1.0
Vendor Advisory: https://github.com/github/securitylab/issues/669
Restart Required: Yes
Instructions:
1. Update to latest version of SummaLabs/DLS repository
2. Verify the send_file function now validates paths
3. Restart the application service
🔧 Temporary Workarounds
Input Validation Middleware
allAdd middleware to validate and sanitize file paths before send_file is called
Implement path validation in Flask route handlers
File System Restrictions
linuxConfigure application to run with minimal file system permissions
chroot jail or containerization with limited file access
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns
- Restrict network access to vulnerable systems using firewall rules
🔍 How to Verify
Check if Vulnerable:
Test if the application allows accessing files with absolute paths like /etc/passwd via crafted URLsCheck Version:
Check package version or repository commit hashVerify Fix Applied:
Attempt path traversal attacks after patch and confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing absolute paths or directory traversal sequences
- Failed file access attempts to sensitive system paths
Network Indicators:
- HTTP requests with ../ sequences or absolute paths in URL parameters
SIEM Query:
web.url:*../* OR web.url:*etc/passwd* OR web.url:*absolute/path*