CVE-2025-31962
📋 TL;DR
This vulnerability allows authenticated attackers to maintain unauthorized access to protected API endpoints in HCL BigFix IVR due to insufficient session expiration. Attackers can exploit excessive session expiration periods to bypass intended access controls. Organizations running HCL BigFix IVR version 4.2 are affected.
💻 Affected Systems
- HCL BigFix IVR
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could maintain persistent unauthorized access to sensitive API endpoints, potentially accessing or modifying configuration data, user information, or system controls beyond their intended permissions.
Likely Case
An authenticated user with limited privileges could maintain elevated access to API endpoints they should have lost access to, potentially viewing or modifying data they shouldn't have access to.
If Mitigated
With proper session management controls and monitoring, the impact is limited to temporary unauthorized access that can be detected and terminated.
🎯 Exploit Status
Exploitation requires an authenticated session and knowledge of API endpoints. The attack involves maintaining access beyond intended session expiration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patch version
Vendor Advisory: https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0127753
Restart Required: Yes
Instructions:
1. Review the HCL advisory at the provided URL
2. Download the appropriate patch for your environment
3. Apply the patch following HCL's installation instructions
4. Restart the BigFix IVR service
5. Verify session expiration is working correctly
🔧 Temporary Workarounds
Manual Session Termination
allManually terminate active sessions more frequently than the default expiration period
Check HCL documentation for session management commands
Network Segmentation
allRestrict access to BigFix IVR Web UI to only necessary users and networks
🧯 If You Can't Patch
- Implement strict access controls and monitoring for API endpoint usage
- Enforce shorter session timeouts through configuration if available
- Regularly audit and terminate active sessions
- Implement network segmentation to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check if running HCL BigFix IVR version 4.2. Review session timeout settings in Web UI configuration.Check Version:
Check BigFix IVR administration interface or consult HCL documentation for version checking commands specific to your installation.Verify Fix Applied:
After patching, test session expiration by logging in and verifying sessions expire according to configured timeout periods.📡 Detection & Monitoring
Log Indicators:
- Unusually long session durations
- API access from sessions that should have expired
- Multiple API requests spanning extended time periods from same session
Network Indicators:
- Sustained API traffic from single sessions over extended periods
- Authentication bypass patterns in API requests
SIEM Query:
source="bigfix_ivr" AND (event_type="api_access" AND session_duration>3600) OR (event_type="session_expiration" AND result="failed")