CVE-2025-31963: HCL BigFix IVR Auth Bypass Vulnerability

CVE-2025-31963 Overview

CVE-2025-31963 is an authentication bypass and Cross-Site Request Forgery (CSRF) vulnerability affecting HCL BigFix IVR version 4.2. The vulnerability exists in the local setup interface component, which fails to properly authenticate administrative requests and lacks CSRF protection mechanisms. This security gap allows a local attacker with access to the system to perform unauthorized configuration changes by submitting unauthenticated administrative configuration requests.

Critical Impact

Local attackers can modify system configuration settings without proper authentication, potentially compromising the integrity and security posture of the HCL BigFix IVR deployment.

Affected Products

• HCL BigFix IVR version 4.2

Discovery Timeline

• 2026-01-07 - CVE CVE-2025-31963 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-31963

Vulnerability Analysis

This vulnerability combines two distinct security weaknesses: improper authentication (CWE-306) and missing CSRF protection. The local setup interface component in HCL BigFix IVR version 4.2 accepts administrative configuration requests without validating that the requester is properly authenticated or authorized to make such changes. Additionally, the absence of CSRF tokens allows an attacker to craft malicious requests that could be executed in the context of a legitimate administrator's session.

The attack requires local access to the system, meaning the attacker must already have some level of access to the machine running HCL BigFix IVR. Furthermore, high privileges are required along with user interaction, which limits the practical exploitability of this vulnerability. The potential impact is limited to confidentiality and integrity concerns, with no direct availability impact.

Root Cause

The root cause stems from inadequate access control implementation in the local setup interface component. The interface was designed without proper authentication checks for administrative functions, failing to verify user identity before processing configuration change requests. Additionally, the component does not implement anti-CSRF tokens or other standard CSRF mitigation techniques, leaving the interface vulnerable to forged request attacks when combined with the authentication weakness.

Attack Vector

The attack vector is local, requiring the attacker to have access to the system where HCL BigFix IVR is installed. An attacker would need to:

1. Gain local access to the target system running HCL BigFix IVR version 4.2
2. Identify the local setup interface endpoint that accepts administrative configuration requests
3. Craft unauthenticated requests to modify system configuration settings
4. Submit these requests directly to the interface, bypassing authentication controls

The vulnerability mechanism involves sending HTTP requests to the local setup interface without proper authentication headers or session tokens. Due to the missing authentication validation, the interface processes these requests as if they were from an authorized administrator. For detailed technical information, refer to the HCL Software Knowledge Base Article.

Detection Methods for CVE-2025-31963

Indicators of Compromise

• Unexpected configuration changes in HCL BigFix IVR settings that were not authorized by administrators
• Log entries showing administrative configuration requests without corresponding authentication events
• Modification timestamps on configuration files that don't align with scheduled maintenance windows

Detection Strategies

• Monitor system logs for unauthenticated access attempts to the local setup interface
• Implement file integrity monitoring on HCL BigFix IVR configuration files to detect unauthorized changes
• Review audit logs for administrative actions that lack proper user authentication context
• Deploy endpoint detection solutions to identify suspicious local process interactions with the setup interface

Monitoring Recommendations

• Enable verbose logging on the HCL BigFix IVR local setup interface to capture all configuration change requests
• Configure alerts for configuration modifications outside of authorized change windows
• Implement SentinelOne's behavioral AI to detect anomalous local process activity targeting administrative interfaces

How to Mitigate CVE-2025-31963

Immediate Actions Required

• Review and apply security updates from HCL Software as they become available
• Restrict local access to systems running HCL BigFix IVR to only authorized administrators
• Implement network segmentation to limit exposure of the local setup interface
• Enable comprehensive logging and monitoring for the affected component

Patch Information

HCL Software has published a knowledge base article addressing this vulnerability. Organizations should consult the HCL Software Knowledge Base Article for official patch information and remediation guidance.

Workarounds

• Limit physical and remote access to systems running HCL BigFix IVR version 4.2 to trusted administrators only
• Implement host-based firewall rules to restrict access to the local setup interface
• Consider disabling the local setup interface if it is not required for ongoing operations
• Deploy additional authentication mechanisms at the network level to protect administrative endpoints

# Example: Restrict local interface access using host firewall
# Adjust interface/port based on your HCL BigFix IVR configuration
iptables -A INPUT -p tcp --dport <setup_interface_port> -s 127.0.0.1 -j ACCEPT
iptables -A INPUT -p tcp --dport <setup_interface_port> -j DROP