CVE-2025-56815
📋 TL;DR
CVE-2025-56815 is a directory traversal vulnerability in Datart 1.0.0-rc.3 that allows attackers to write arbitrary files to any location on the server via the POST /viz/image interface. This occurs because the server uses MultipartFile.transferTo() without properly validating user-controlled file paths. Organizations running vulnerable Datart instances are affected.
💻 Affected Systems
- Datart
📦 What is this software?
Datart by Running Elephant
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution by overwriting critical system files or web application files, potentially leading to complete server compromise.
Likely Case
Arbitrary file write allowing attackers to deface websites, upload malicious scripts, or disrupt application functionality.
If Mitigated
Limited impact if file system permissions restrict write access to non-critical directories.
🎯 Exploit Status
Public proof-of-concept code exists on GitHub. Exploitation requires only HTTP POST requests with crafted file paths.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to reject file paths containing directory traversal sequences (../, ..\)
# Add validation in the file upload handler to sanitize file names
# Example Java: if (fileName.contains("..") || fileName.contains("/") || fileName.contains("\\")) { reject upload; }
Web Application Firewall Rule
allBlock requests to /viz/image containing directory traversal patterns
# WAF rule to block ../ patterns in POST body
# Example ModSecurity: SecRule REQUEST_BODY "\.\./" "id:1001,phase:2,deny"
🧯 If You Can't Patch
- Disable the /viz/image endpoint if not required for business functionality
- Implement strict file system permissions to limit write access to specific directories only
🔍 How to Verify
Check if Vulnerable:
Test by sending a POST request to /viz/image with a file containing directory traversal in the filename parameterCheck Version:
Check Datart version in application configuration or via web interfaceVerify Fix Applied:
Attempt the same exploit after implementing fixes; successful requests should be rejected📡 Detection & Monitoring
Log Indicators:
- Multiple failed POST requests to /viz/image
- File write errors showing path traversal attempts
- Unusual file creation in system directories
Network Indicators:
- HTTP POST requests to /viz/image with ../ patterns in payload
- Unusual file upload traffic to the application
SIEM Query:
source="web_server" AND uri_path="/viz/image" AND (http_method="POST" AND request_body MATCHES "\.\./")