CVE-2023-39017
📋 TL;DR
CVE-2023-39017 is a code injection vulnerability in quartz-jobs 2.3.2 and earlier that could allow remote code execution via the SendQueueMessageJob.execute component. The vulnerability is disputed because it requires untrusted input to reach specific internal code paths, making exploitation unlikely in typical configurations. Organizations using vulnerable versions of quartz-scheduler with custom job implementations could be affected.
💻 Affected Systems
- quartz-scheduler
📦 What is this software?
Quartz by Softwareag
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the quartz-scheduler process, potentially leading to complete system compromise.
Likely Case
Limited impact due to the disputed nature requiring specific internal code paths; most likely denial of service or application disruption.
If Mitigated
Minimal impact if proper input validation and security controls prevent untrusted data from reaching vulnerable components.
🎯 Exploit Status
Exploitation requires specific internal access and custom job configurations; disputed vulnerability with low practical exploitability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.3
Vendor Advisory: https://github.com/quartz-scheduler/quartz/issues/943
Restart Required: Yes
Instructions:
1. Update quartz-scheduler dependency to version 2.3.3 or higher. 2. Rebuild and redeploy applications using quartz-scheduler. 3. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation in custom job implementations to prevent untrusted data from reaching SendQueueMessageJob.
Access Control
allRestrict access to job scheduling interfaces to trusted users only.
🧯 If You Can't Patch
- Implement network segmentation to isolate quartz-scheduler instances from untrusted networks.
- Monitor for unusual job execution patterns and implement application-level firewalls.
🔍 How to Verify
Check if Vulnerable:
Check the quartz-scheduler version in your project dependencies or classpath; versions 2.3.2 or below are vulnerable.Check Version:
Check Maven/Gradle dependencies or examine quartz-core-*.jar manifest file.Verify Fix Applied:
Verify that quartz-scheduler version is 2.3.3 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Unusual job execution patterns in quartz-scheduler logs
- Errors from SendQueueMessageJob with unexpected input
Network Indicators:
- Unusual network connections originating from quartz-scheduler process
SIEM Query:
Search for quartz-scheduler logs containing 'SendQueueMessageJob' with suspicious parameters.