CVE-2025-3984
📋 TL;DR
This critical vulnerability in Apereo CAS 5.2.6 allows remote attackers to execute arbitrary code through the Groovy Code Handler component. The vulnerability exists in the saveService function and enables code injection attacks. Organizations running affected Apereo CAS versions are at risk.
💻 Affected Systems
- Apereo CAS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Unauthorized access to the CAS management interface, potential privilege escalation, and manipulation of authentication services.
If Mitigated
Limited impact if proper network segmentation, input validation, and access controls are implemented.
🎯 Exploit Status
Exploit has been publicly disclosed but requires specific conditions and knowledge of the target system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check for vendor patches or updates. 2. Upgrade to a newer version if available. 3. Apply security patches if released by Apereo.
🔧 Temporary Workarounds
Disable Groovy Code Handler
allDisable or restrict access to the vulnerable Groovy Code Handler component
Modify CAS configuration to disable groovyScriptEngineEnabled or restrict access to management endpoints
Network Access Controls
allRestrict network access to CAS management interface
Configure firewall rules to limit access to CAS management ports from trusted IPs only
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs
- Deploy web application firewall with code injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check if running Apereo CAS version 5.2.6 and verify if Groovy Code Handler is enabled in configurationCheck Version:
Check CAS application logs or configuration files for version informationVerify Fix Applied:
Verify CAS version is updated beyond 5.2.6 or confirm Groovy Code Handler is disabled📡 Detection & Monitoring
Log Indicators:
- Unusual Groovy script execution patterns
- Unexpected access to management endpoints
- Error logs related to code injection attempts
Network Indicators:
- Unusual traffic to CAS management ports
- Suspicious payloads in HTTP requests to CAS endpoints
SIEM Query:
source="cas.log" AND ("groovy" OR "script" OR "injection") AND severity=HIGH