CVE-2025-49656
📋 TL;DR
This vulnerability allows administrators in Apache Jena Fuseki to create database files outside the designated files area, potentially enabling path traversal attacks. It affects all Apache Jena versions up to 5.4.0. Administrators with file system access could exploit this to write arbitrary files.
💻 Affected Systems
- Apache Jena Fuseki
📦 What is this software?
Jena by Apache
⚠️ Risk & Real-World Impact
Worst Case
Administrator could write malicious files to sensitive system locations, potentially leading to remote code execution, data corruption, or privilege escalation.
Likely Case
Malicious administrator or compromised admin account could write files to unauthorized directories, potentially disrupting services or exfiltrating data.
If Mitigated
With proper access controls and monitoring, impact is limited to authorized administrators performing legitimate operations.
🎯 Exploit Status
Exploitation requires administrator credentials. The vulnerability is a path traversal issue in database file creation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.5.0
Vendor Advisory: https://lists.apache.org/thread/qmm21som8zct813vx6dfd1phnfro6mwq
Restart Required: Yes
Instructions:
1. Download Apache Jena version 5.5.0 or later. 2. Stop the Fuseki server. 3. Replace the existing installation with the new version. 4. Restart the Fuseki server.
🔧 Temporary Workarounds
Restrict Administrator Access
allLimit administrator accounts to trusted users only and implement strong authentication controls.
File System Permissions
linuxConfigure operating system permissions to restrict the Fuseki process from writing outside designated directories.
chmod -R 750 /path/to/fuseki/files
chown -R fuseki:fuseki /path/to/fuseki/files
🧯 If You Can't Patch
- Implement strict access controls for administrator accounts and monitor administrator activities closely.
- Use containerization or virtualization to isolate the Fuseki server and limit file system access.
🔍 How to Verify
Check if Vulnerable:
Check the Apache Jena version. If it's 5.4.0 or earlier, the system is vulnerable if Fuseki is running with administrator access enabled.Check Version:
java -jar fuseki-server.jar --versionVerify Fix Applied:
Verify the Apache Jena version is 5.5.0 or later and test that database files can only be created within the designated files area.📡 Detection & Monitoring
Log Indicators:
- Log entries showing database file creation outside the expected files directory
- Administrator account performing unusual file operations
Network Indicators:
- Unusual HTTP requests to Fuseki admin endpoints creating database files
SIEM Query:
source="fuseki.log" AND ("database" OR "file") AND NOT path:"/path/to/expected/files/*"