CVE-2025-31963
📋 TL;DR
This vulnerability allows a local attacker to make unauthorized configuration changes to HCL BigFix IVR without authentication. It affects systems running version 4.2 where an attacker has local access to the setup interface. The issue stems from missing CSRF protection and improper authentication checks.
💻 Affected Systems
- HCL BigFix IVR
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could reconfigure the IVR system to intercept or redirect calls, modify security settings, or disrupt operations.
Likely Case
Local users could make unauthorized configuration changes that affect IVR functionality or security settings.
If Mitigated
With proper network segmentation and access controls, the impact is limited to authorized local users only.
🎯 Exploit Status
Exploitation requires local network access to the setup interface but no authentication. The technical complexity is low as it involves sending unauthenticated administrative requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0127753
Restart Required: Yes
Instructions:
1. Review the vendor advisory at the provided URL. 2. Apply the recommended patch or upgrade to a fixed version. 3. Restart the BigFix IVR service to apply changes.
🔧 Temporary Workarounds
Restrict Local Network Access
allLimit access to the setup interface to trusted IP addresses only using firewall rules.
# Example Linux iptables rule: iptables -A INPUT -p tcp --dport [setup-port] -s [trusted-ip] -j ACCEPT
# Example Windows firewall: New-NetFirewallRule -DisplayName "Restrict BigFix IVR Setup" -Direction Inbound -LocalPort [setup-port] -RemoteAddress [trusted-ip] -Action Allow
Disable Setup Interface If Not Needed
allTemporarily disable the local setup interface component if it's not required for daily operations.
# Check vendor documentation for specific disable commands
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the BigFix IVR system from untrusted networks.
- Monitor access logs to the setup interface for unauthorized configuration attempts.
🔍 How to Verify
Check if Vulnerable:
Check if HCL BigFix IVR version is 4.2 and the local setup interface is accessible without authentication.Check Version:
Check the BigFix IVR administration console or configuration files for version information.Verify Fix Applied:
After patching, attempt to access the setup interface without authentication - it should require proper credentials.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to administrative configuration endpoints
- Unexpected configuration changes in IVR settings
Network Indicators:
- Unusual traffic to the setup interface port from unauthorized sources
SIEM Query:
source="bigfix_ivr_logs" AND (event="configuration_change" AND user="unauthenticated")