CVE-2024-51545: ABB ASPECT Firmware Auth Bypass Flaw

CVE-2024-51545 Overview

CVE-2024-51545 is a critical username enumeration vulnerability affecting ABB building automation and energy management systems. This vulnerability allows unauthenticated remote attackers to access application-level username management functions including the ability to add, delete, modify, and list user accounts. The flaw stems from insufficiently protected credentials (CWE-522) in the affected firmware versions.

The vulnerability impacts ABB ASPECT Enterprise, NEXUS Series, and MATRIX Series devices running firmware version 3.08.02. These systems are commonly deployed in building automation, energy management, and industrial control environments, making this vulnerability particularly concerning for critical infrastructure operators.

Critical Impact

Unauthenticated attackers can remotely enumerate, create, modify, and delete user accounts, potentially leading to complete system compromise of building automation and energy management systems.

Affected Products

• ABB ASPECT Enterprise v3.08.02 (ASPECT-ENT-2, ASPECT-ENT-12, ASPECT-ENT-96, ASPECT-ENT-256)
• ABB NEXUS Series v3.08.02 (NEXUS-264, NEXUS-2128, NEXUS-3-264, NEXUS-3-2128 and variants)
• ABB MATRIX Series v3.08.02 (MATRIX-11, MATRIX-216, MATRIX-232, MATRIX-264, MATRIX-296)

Discovery Timeline

• December 5, 2024 - CVE-2024-51545 published to NVD
• February 27, 2025 - Last updated in NVD database

Technical Details for CVE-2024-51545

Vulnerability Analysis

This username enumeration vulnerability exposes critical user management functionality without proper authentication controls. The affected ABB systems fail to adequately protect credential-related operations, allowing remote attackers to interact with user account management APIs directly over the network.

The vulnerability enables attackers to perform reconnaissance by listing existing usernames, which can be leveraged for subsequent password attacks. More critically, the flaw permits unauthorized creation and deletion of user accounts, potentially allowing attackers to establish persistent backdoor access or lock out legitimate administrators.

Building automation systems like those affected by this vulnerability often control HVAC, lighting, access control, and energy management in commercial and industrial facilities. Compromise of these systems could lead to physical security breaches, operational disruptions, or safety hazards.

Root Cause

The root cause is classified as CWE-522: Insufficiently Protected Credentials. The application fails to implement proper authentication and authorization checks on sensitive user management endpoints. This allows unauthenticated network requests to access functions that should require administrative privileges.

The firmware does not validate that requests to user management APIs originate from authenticated sessions with appropriate privileges, effectively exposing administrative functionality to any network-accessible attacker.

Attack Vector

The attack can be executed remotely over the network without any authentication or user interaction. An attacker with network access to the vulnerable device can directly interact with the user management functionality.

The exploitation process involves sending crafted requests to the exposed user management endpoints. These requests can enumerate existing accounts, create new administrative users, modify existing user permissions, or delete legitimate user accounts. Since no authentication is required, the attack surface is significant for any device exposed to untrusted networks.

Detection Methods for CVE-2024-51545

Indicators of Compromise

• Unexpected new user accounts appearing in the ABB device management interface
• Unauthorized modifications to existing user account permissions or credentials
• Missing or deleted administrator accounts that were previously configured
• Anomalous network traffic to user management API endpoints from external sources

Detection Strategies

• Monitor network traffic for unauthenticated requests to user management endpoints on ABB devices
• Implement network intrusion detection rules to alert on enumeration patterns targeting these systems
• Review device audit logs for unusual user account creation, modification, or deletion activities
• Deploy honeypot accounts to detect unauthorized enumeration attempts

Monitoring Recommendations

• Enable verbose logging on ABB ASPECT, NEXUS, and MATRIX devices to capture authentication events
• Configure SIEM alerts for multiple failed authentication attempts or rapid account enumeration patterns
• Establish baseline user account inventories and alert on deviations
• Monitor for network reconnaissance activities targeting building automation system ports

How to Mitigate CVE-2024-51545

Immediate Actions Required

• Isolate affected ABB devices from untrusted networks immediately using network segmentation
• Implement firewall rules to restrict access to device management interfaces to authorized IP addresses only
• Review existing user accounts on affected devices and remove any unauthorized entries
• Enable multi-factor authentication where supported and enforce strong password policies

Patch Information

ABB has released a security advisory addressing this vulnerability. Organizations should upgrade affected firmware to a patched version as soon as available. Refer to the ABB Security Advisory for specific patch information and updated firmware versions.

Contact ABB support for guidance on obtaining and deploying the security update for your specific device models.

Workarounds

• Place all affected devices behind a properly configured firewall that blocks access from untrusted networks
• Use a VPN for remote management access rather than exposing device interfaces directly to the internet
• Implement network segmentation to isolate building automation systems from general IT networks
• Monitor and audit user account lists regularly until patches can be applied

# Example firewall rule to restrict management access (adjust for your environment)
# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 443 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Log all connection attempts to management ports for forensic analysis
iptables -A INPUT -p tcp --dport 443 -j LOG --log-prefix "ABB-MGMT-ACCESS: "