CVE-2023-41916
📋 TL;DR
Apache Linkis versions up to 1.4.0 have a vulnerability where attackers with authorized accounts can configure malicious MySQL JDBC parameters to trigger arbitrary file reading. This occurs due to insufficient parameter filtering in the DataSource Manager Module. Only authenticated attackers can exploit this vulnerability.
💻 Affected Systems
- Apache Linkis
📦 What is this software?
Linkis by Apache
⚠️ Risk & Real-World Impact
Worst Case
Attackers with valid credentials could read sensitive system files, configuration files, or database credentials, potentially leading to further system compromise.
Likely Case
Authenticated malicious users or compromised accounts reading sensitive configuration files or data from the server filesystem.
If Mitigated
With proper access controls and monitoring, impact is limited to authorized users who would already have some level of system access.
🎯 Exploit Status
Exploitation requires authenticated access. The vulnerability is in parameter handling for MySQL JDBC URLs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.0
Vendor Advisory: https://lists.apache.org/thread/dxkpwyoxy1jpdwlpqp15zvo0jxn4v729
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download Apache Linkis 1.5.0 from official sources. 3. Stop Linkis services. 4. Replace with version 1.5.0. 5. Restart Linkis services. 6. Verify functionality.
🔧 Temporary Workarounds
MySQL JDBC Parameter Blacklisting
allImplement input validation to blacklist dangerous MySQL JDBC parameters at the application level.
Restrict DataSource Manager Access
allLimit access to DataSource Manager Module to only trusted administrators.
🧯 If You Can't Patch
- Implement strict access controls and monitor DataSource Manager Module usage
- Deploy network segmentation to isolate Linkis instances from sensitive systems
🔍 How to Verify
Check if Vulnerable:
Check Linkis version: if version <= 1.4.0, system is vulnerable. Review if MySQL JDBC configuration is accessible.Check Version:
Check Linkis configuration files or admin interface for version informationVerify Fix Applied:
Verify Linkis version is 1.5.0 or higher. Test that malicious MySQL JDBC parameters are properly filtered.📡 Detection & Monitoring
Log Indicators:
- Unusual MySQL JDBC configuration attempts
- Multiple failed authentication attempts followed by DataSource Manager access
- File read operations from unexpected processes
Network Indicators:
- Unusual outbound connections from Linkis servers
- Traffic patterns suggesting file exfiltration
SIEM Query:
source="linkis.log" AND ("MySQL" OR "JDBC") AND ("parameter" OR "config") AND suspicious_patterns