CVE-2015-0981 in BACnet OPC
Summary
by MITRE
The SOAP web interface in SCADA Engine BACnet OPC Server before 2.1.371.24 allows remote attackers to bypass authentication and read or write to arbitrary database fields via unspecified vectors.
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Analysis
by VulDB Data Team • 06/29/2017
The vulnerability identified as CVE-2015-0981 affects the SCADA Engine BACnet OPC Server software, specifically targeting its SOAP web interface implementation. This represents a critical authentication bypass flaw that undermines the security posture of industrial control systems. The affected version range includes all releases prior to 2.1.371.24, indicating this was a long-standing issue within the software ecosystem. The vulnerability resides in the web interface layer that handles SOAP protocol communications, which are commonly used for remote procedure calls in industrial automation environments where standardized communication protocols are essential for system interoperability.
The technical flaw manifests as an insufficient authentication mechanism within the SOAP web interface, allowing remote attackers to circumvent the normal access control measures. Attackers can exploit this weakness to perform unauthorized read and write operations against arbitrary database fields within the system. The unspecified vectors suggest that multiple attack pathways may exist, potentially including improper input validation, weak session management, or flawed privilege escalation mechanisms. This vulnerability directly violates fundamental security principles by permitting unauthorized data manipulation without proper authentication credentials, creating a significant attack surface for malicious actors targeting industrial control systems.
The operational impact of this vulnerability extends beyond simple data access, as it enables full database manipulation capabilities that can compromise the integrity and availability of critical industrial processes. Remote attackers can potentially alter configuration settings, modify operational parameters, or inject malicious data into the SCADA system, leading to system instability, operational disruption, or even safety hazards in critical infrastructure environments. The ability to read arbitrary database fields also exposes sensitive operational data that could be leveraged for further attacks or system compromise. This vulnerability particularly impacts environments where BACnet OPC servers are used for supervisory control and data acquisition in industrial settings, including manufacturing facilities, energy grids, and critical infrastructure installations.
The security implications align with CWE-287, which addresses improper authentication issues in software systems, and can be mapped to ATT&CK technique T1190 for exploitation of remote services and T1078 for valid accounts usage. Organizations should implement immediate mitigation strategies including upgrading to the patched version 2.1.371.24 or later, implementing network segmentation to limit access to the affected SOAP interface, and deploying intrusion detection systems to monitor for suspicious SOAP traffic patterns. Additional defensive measures should include disabling unnecessary web interfaces, implementing strong access controls, and conducting regular security assessments of industrial control system components to identify similar vulnerabilities. The incident highlights the importance of maintaining up-to-date security patches in industrial environments where legacy systems may contain unaddressed vulnerabilities that pose significant risks to operational technology infrastructure.