CVE-2024-25274
📋 TL;DR
This vulnerability allows attackers to upload arbitrary files to Novel-Plus systems via the /sysFile/upload endpoint, potentially leading to remote code execution. It affects Novel-Plus v4.3.0-RC1 installations. Attackers can compromise the entire system if successful.
💻 Affected Systems
- Novel-Plus
📦 What is this software?
Novel Plus by Xxyopen
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control, data exfiltration, ransomware deployment, and lateral movement to other systems.
Likely Case
Webshell deployment leading to persistent backdoor access, data theft, and further exploitation of the server environment.
If Mitigated
File upload blocked or sanitized, preventing malicious file execution while maintaining legitimate upload functionality.
🎯 Exploit Status
The vulnerability requires no authentication and has a simple exploitation path via HTTP file upload. Public proof-of-concept code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for official patch from Novel-Plus developers
2. If patch available, download and apply according to vendor instructions
3. Verify the fix by testing file upload functionality
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock or restrict access to the vulnerable /sysFile/upload endpoint
WAF specific - configure rule to block POST requests to /sysFile/upload
File Upload Restriction
allImplement server-side file type validation and extension filtering
Application specific - modify upload handler to validate file types and extensions
🧯 If You Can't Patch
- Isolate the vulnerable system from the internet using firewall rules
- Implement strict file upload validation and store uploaded files outside web root
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a file with executable extension (e.g., .php, .jsp) to /sysFile/upload endpoint and check if it's accepted without validationCheck Version:
Check Novel-Plus version in application configuration or admin panelVerify Fix Applied:
Test file upload with various file types - malicious extensions should be rejected or sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /sysFile/upload
- Files with executable extensions in upload directories
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to /sysFile/upload with suspicious file names
- Unusual outbound connections from web server
SIEM Query:
source="web_server" AND (uri="/sysFile/upload" OR filename="*.php" OR filename="*.jsp")