CVE-2024-51547: ABB ASPECT-ENT-2 Auth Bypass Vulnerability

CVE-2024-51547 Overview

CVE-2024-51547 is a Use of Hard-coded Credentials vulnerability (CWE-798) affecting ABB building automation and energy management systems, including the ASPECT-Enterprise, NEXUS Series, and MATRIX Series product lines. This vulnerability allows remote, unauthenticated attackers to leverage embedded credentials within the device firmware to gain unauthorized access to affected systems, potentially leading to complete system compromise.

These ABB products are commonly deployed in critical infrastructure environments including commercial buildings, industrial facilities, and energy management systems. The presence of hard-coded credentials represents a fundamental security flaw that cannot be mitigated by traditional password management practices, as the credentials are embedded directly in the firmware.

Critical Impact

Remote attackers can use hard-coded credentials to gain full administrative access to building automation and energy management systems without any authentication, potentially controlling HVAC, lighting, and other critical building systems.

Affected Products

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

Discovery Timeline

• 2025-02-06 - CVE-2024-51547 published to NVD
• 2025-05-23 - Last updated in NVD database

Technical Details for CVE-2024-51547

Vulnerability Analysis

The vulnerability stems from the presence of hard-coded credentials embedded within the firmware of ABB building automation products. Hard-coded credentials are authentication secrets (usernames, passwords, API keys, or cryptographic keys) that are written directly into the source code or firmware of a device rather than being configured dynamically.

When hard-coded credentials are present in firmware, they are typically identical across all deployed instances of that product, meaning that discovery of the credentials on one device immediately compromises all devices of the same type and firmware version. This vulnerability is particularly severe in industrial control and building automation systems where these devices often have extensive access to physical infrastructure.

The attack surface is network-accessible, requiring no user interaction and no prior authentication. An attacker who discovers or reverse-engineers the hard-coded credentials can authenticate to any vulnerable device exposed on the network. Given that these products manage building automation functions, successful exploitation could result in unauthorized control over HVAC systems, lighting, access control, and energy management systems.

Root Cause

The root cause of CVE-2024-51547 is a design flaw where authentication credentials were embedded directly into the firmware code during development. This practice, while sometimes used for convenience during development or testing, creates an inherent security weakness that cannot be remediated through configuration changes. The credentials may have been intended for administrative access, debugging, or system maintenance, but their presence in production firmware creates an authentication bypass vector.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability through the following attack pattern:

1. Discovery Phase: The attacker identifies ABB ASPECT, NEXUS, or MATRIX devices on the network through service enumeration or banner grabbing
2. Credential Extraction: The hard-coded credentials may be obtained through firmware analysis, reverse engineering, or from public disclosure sources
3. Authentication: Using the hard-coded credentials, the attacker authenticates to the device's management interface
4. System Compromise: Once authenticated, the attacker gains administrative access to the building automation system, allowing them to modify configurations, monitor data, or disrupt operations

The vulnerability enables full confidentiality, integrity, and availability impact on the affected systems. For building automation systems, this could translate to unauthorized access to building layouts and occupancy data, manipulation of environmental controls, or denial of service to critical building systems.

Detection Methods for CVE-2024-51547

Indicators of Compromise

• Unexpected or unauthorized login events to ABB ASPECT, NEXUS, or MATRIX management interfaces from unknown IP addresses
• Authentication attempts using the known hard-coded credentials from external or unusual network locations
• Configuration changes to building automation systems that were not initiated by authorized personnel
• Unusual network traffic patterns to or from the management interfaces of affected devices

Detection Strategies

• Implement network monitoring to detect authentication attempts to ABB building automation devices, particularly from external networks or unusual internal sources
• Deploy SentinelOne Singularity platform to monitor endpoint and network activity for signs of exploitation targeting industrial control systems
• Configure SIEM rules to alert on successful authentication events to affected devices during unusual hours or from unexpected sources
• Monitor firmware integrity through hash verification to detect any unauthorized modifications

Monitoring Recommendations

• Enable comprehensive logging on all affected ABB devices and forward logs to a centralized SIEM for analysis
• Implement network segmentation monitoring to detect any attempts to access industrial control network segments from corporate or external networks
• Use SentinelOne's Singularity XDR capabilities to correlate authentication events across building automation infrastructure
• Establish baseline behavior profiles for normal administrative access patterns to quickly identify anomalous activity

How to Mitigate CVE-2024-51547

Immediate Actions Required

• Review the ABB Security Advisory for specific guidance on affected firmware versions and available patches
• Isolate affected ABB devices from external network access immediately by placing them on segmented networks with strict firewall rules
• Implement network access control lists (ACLs) to restrict management interface access to only authorized administrative workstations
• Conduct an audit of all deployed ABB ASPECT, NEXUS, and MATRIX devices to create a complete inventory of potentially vulnerable systems

Patch Information

ABB has released firmware updates to address this vulnerability. Organizations should consult the official ABB Security Advisory for specific patch versions and upgrade instructions. All firmware versions through 3.* are affected across the ASPECT-Enterprise, NEXUS Series, and MATRIX Series product lines. Organizations should prioritize firmware updates to versions that remove or replace the hard-coded credentials.

Workarounds

• Implement strict network segmentation to isolate building automation systems from corporate networks and the internet
• Deploy firewall rules to restrict access to device management interfaces to specific, authorized IP addresses only
• Enable additional authentication mechanisms where available, such as VPN access requirements for remote management
• Monitor all access attempts to affected devices and implement alerting for any unauthorized authentication events

# Example network segmentation firewall rules (adapt to your environment)
# Restrict access to ABB device management interfaces (example ports)
iptables -A INPUT -p tcp --dport 443 -s 10.10.50.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 0.0.0.0/0 -j DROP
iptables -A INPUT -p tcp --dport 80 -s 10.10.50.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -s 0.0.0.0/0 -j DROP