CVE-2023-26563
📋 TL;DR
CVE-2023-26563 is a critical directory traversal vulnerability in Syncfusion EJ2 Node File Provider that allows unauthenticated attackers to read, delete, and upload files anywhere the web server can access. This affects any application using the vulnerable Syncfusion file manager component. Attackers can completely compromise affected systems through arbitrary file operations.
💻 Affected Systems
- Syncfusion EJ2 Node File Provider
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise: attackers can upload malicious files, delete critical system files, steal sensitive data, and potentially achieve remote code execution.
Likely Case
Data theft and system disruption: attackers will likely exfiltrate sensitive files, delete important data, and potentially deploy ransomware or backdoors.
If Mitigated
Limited impact if proper network segmentation, file permissions, and web server sandboxing are implemented.
🎯 Exploit Status
Public proof-of-concept code exists on GitHub. The vulnerability requires no authentication and is trivial to exploit with basic HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Syncfusion documentation for latest secure version
Vendor Advisory: https://ej2.syncfusion.com/documentation/file-manager/file-system-provider/
Restart Required: Yes
Instructions:
1. Update to the latest Syncfusion EJ2 Node File Provider version. 2. Review Syncfusion security advisories. 3. Restart affected services. 4. Verify the fix by testing directory traversal attempts.
🔧 Temporary Workarounds
Network Access Control
allRestrict network access to the vulnerable endpoint using firewalls or network segmentation
Web Server Sandboxing
linuxRun the web server with minimal file system permissions using chroot or containerization
chroot /var/www/secure-env /usr/bin/node app.js
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the vulnerable component
- Apply strict file system permissions to limit what the web server user can access
🔍 How to Verify
Check if Vulnerable:
Test for directory traversal by attempting to access files outside the intended directory using ../ sequences in file operationsCheck Version:
Check package.json or Syncfusion documentation for the installed version of @syncfusion/ej2-filemanagerVerify Fix Applied:
After patching, attempt the same directory traversal attacks and verify they are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns
- Multiple ../ sequences in file paths
- File operations outside expected directories
- Unauthenticated file management requests
Network Indicators:
- HTTP requests with ../ sequences in parameters
- Unusual file upload/download patterns
- Requests to file manager endpoints from unexpected sources
SIEM Query:
source="web_server" AND (uri="*../*" OR params="*../*") AND (status=200 OR status=201)🔗 References
- https://ej2.syncfusion.com/documentation/file-manager/file-system-provider/
- https://github.com/RupturaInfoSec/CVE-2023-26563-26564-26565/
- https://github.com/SyncfusionExamples/ej2-filemanager-node-filesystem
- https://ej2.syncfusion.com/documentation/file-manager/file-system-provider/
- https://github.com/RupturaInfoSec/CVE-2023-26563-26564-26565/
- https://github.com/SyncfusionExamples/ej2-filemanager-node-filesystem
