CVE-2023-52891 in SIMATIC Energy Manager Basic
Summary
by MITRE • 07/09/2024
A vulnerability has been identified in SIMATIC Energy Manager Basic (All versions < V7.5), SIMATIC Energy Manager PRO (All versions < V7.5), SIMATIC IPC DiagBase (All versions), SIMATIC IPC DiagMonitor (All versions), SIMIT V10 (All versions), SIMIT V11 (All versions < V11.1). Unified Automation .NET based OPC UA Server SDK before 3.2.2 used in Siemens products are affected by a similar vulnerability as documented in CVE-2023-27321 for the OPC Foundation UA .NET Standard implementation. A successful attack may lead to high load situation and memory exhaustion, and may block the server.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/09/2024
This vulnerability affects Siemens industrial software products that utilize the Unified Automation .NET based OPC UA Server SDK version prior to 3.2.2, creating a significant risk in industrial control systems environments. The flaw manifests as a denial of service condition that can be exploited through improper handling of OPC UA communication patterns, specifically targeting memory management and resource allocation within the server implementation. The vulnerability is particularly concerning because it impacts multiple Siemens products including Energy Manager Basic and PRO versions, IPC DiagBase and DiagMonitor applications, and various SIMIT versions, indicating a widespread exposure across industrial automation platforms. The affected components leverage the OPC Foundation UA .NET Standard implementation which shares similar characteristics with the previously documented CVE-2023-27321 vulnerability, suggesting a common architectural weakness in the underlying SDK.
The technical flaw stems from inadequate memory management and resource handling within the OPC UA server implementation, where malicious or malformed OPC UA requests can trigger excessive memory consumption and CPU load. Attackers can exploit this vulnerability by sending specially crafted OPC UA messages that cause the server to allocate excessive memory resources without proper cleanup mechanisms. This leads to a high load situation where system resources become exhausted, ultimately causing the OPC UA server to become unresponsive or crash entirely. The vulnerability operates at the application layer and requires no authentication for exploitation, making it particularly dangerous in operational technology environments where systems may be exposed to external networks or where insider threats exist. The impact is amplified by the fact that these are industrial control systems where server unavailability can lead to production downtime and operational disruptions.
The operational impact of this vulnerability extends beyond simple service interruption, as it can compromise the reliability of industrial processes that depend on continuous OPC UA communication. When the server becomes blocked due to memory exhaustion, it affects not only the immediate system but potentially cascading effects throughout connected industrial networks where data exchange and control signals are disrupted. The vulnerability affects critical infrastructure components including energy management systems and simulation environments that are essential for industrial operations and training purposes. Organizations using affected Siemens products face potential production losses, increased maintenance costs, and compromised operational security. The risk is particularly elevated in environments where these systems are integrated with enterprise networks or where they serve as communication bridges between different industrial protocol domains.
Mitigation strategies should focus on immediate software updates to Unified Automation .NET based OPC UA Server SDK version 3.2.2 or later, which addresses the memory management issues and implements proper resource cleanup mechanisms. Network segmentation and access controls should be implemented to limit exposure of affected systems to untrusted networks, reducing the attack surface available to potential adversaries. Regular monitoring of system resource utilization and performance metrics should be established to detect early signs of exploitation attempts. Additionally, implementing network intrusion detection systems that can identify anomalous OPC UA traffic patterns may help in detecting exploitation attempts before they cause significant damage. Organizations should also conduct comprehensive vulnerability assessments across their industrial control systems to identify other potentially affected components that may share similar architectural vulnerabilities. The remediation process must be carefully planned to avoid disrupting critical industrial operations, requiring coordination between IT and OT teams to ensure minimal impact during the update process.