CVE-2022-31507
📋 TL;DR
This vulnerability allows attackers to perform absolute path traversal attacks in Ganga software versions before 8.5.10. By exploiting unsafe use of Flask's send_file function, attackers can access arbitrary files on the server. This affects all users running vulnerable versions of Ganga.
💻 Affected Systems
- Ganga
📦 What is this software?
Ganga by Ganga Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through arbitrary file read/write, potentially leading to sensitive data exposure, credential theft, and 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 and network segmentation, though path traversal could still expose some files.
🎯 Exploit Status
Path traversal vulnerabilities are typically easy to exploit with basic HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.5.10
Vendor Advisory: https://github.com/ganga-devs/ganga/releases/tag/8.5.10
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop Ganga service. 3. Upgrade to version 8.5.10 or later using pip: 'pip install ganga>=8.5.10'. 4. Restart Ganga service.
🔧 Temporary Workarounds
Input Validation Filter
allImplement middleware to validate and sanitize file path inputs before they reach Flask send_file.
# Add input validation in Flask routes before send_file calls
# Example: validate path contains no '../' or absolute paths
File Permission Restriction
linuxRun Ganga with minimal file system permissions and restrict access to sensitive directories.
# Run as non-root user
sudo -u gangauser python ganga_app.py
# Set restrictive permissions
chmod 750 /path/to/ganga/data
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns in requests.
- Isolate Ganga instances in containers with restricted filesystem access using read-only mounts where possible.
🔍 How to Verify
Check if Vulnerable:
Check Ganga version: 'python -c "import ganga; print(ganga.__version__)"' - if version < 8.5.10, system is vulnerable.Check Version:
python -c "import ganga; print(ganga.__version__)"Verify Fix Applied:
After patching, verify version is 8.5.10 or higher and test that path traversal attempts return appropriate errors.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' patterns
- File access errors for unexpected paths
- Failed authentication attempts for file access
Network Indicators:
- HTTP requests with encoded path traversal sequences (%2e%2e%2f)
- Unusual file extension requests in URLs
SIEM Query:
source="web_logs" AND (url="*../*" OR url="*/..*" OR url="*%2e%2e%2f*")🔗 References
- https://github.com/ganga-devs/ganga/commit/730e7aba192407d35eb37dd7938d49071124be8c
- https://github.com/ganga-devs/ganga/releases/tag/8.5.10
- https://github.com/github/securitylab/issues/669#issuecomment-1117265726
- https://github.com/ganga-devs/ganga/commit/730e7aba192407d35eb37dd7938d49071124be8c
- https://github.com/ganga-devs/ganga/releases/tag/8.5.10
- https://github.com/github/securitylab/issues/669#issuecomment-1117265726
