CVE-2024-23815 is a high-severity vulnerability affecting Siemens Desigo CC, a building management system widely used for integrated facility control. The vulnerability arises from missing authentication checks on critical functions within the Desigo CC server application. Specifically, the server fails to authenticate certain client requests sent via the event port (default TCP port 4998). An attacker who can modify the client binary and send crafted requests to this port can execute arbitrary SQL queries on the server database without any authentication. This SQL injection-like capability allows unauthorized remote attackers to potentially manipulate or extract sensitive data stored in the database. The vulnerability affects all versions of Desigo CC when the server is accessible from installed clients outside of highly protected network zones or even within highly protected zones if access is allowed. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality. The vulnerability does not impact integrity or availability directly but poses a significant risk of data exposure or unauthorized data access. No patches have been published yet, and no known exploits are reported in the wild as of the publication date. However, the ability to execute arbitrary SQL queries remotely without authentication makes this a critical concern for organizations relying on Desigo CC for building automation and security management.

For European organizations, the impact of CVE-2024-23815 is substantial due to the widespread use of Siemens Desigo CC in critical infrastructure, commercial buildings, and industrial facilities. Unauthorized SQL query execution could lead to exposure of sensitive operational data, including building access logs, security configurations, and system credentials. This could facilitate further attacks such as unauthorized physical access, espionage, or disruption of building management functions. The lack of authentication on critical functions increases the risk of insider threats or external attackers gaining foothold without detection. Given the integration of Desigo CC with other building and security systems, compromise could cascade into broader operational disruptions. The vulnerability is particularly concerning for organizations with remote or less strictly segmented network access to Desigo CC servers, increasing the attack surface. Compliance with European data protection regulations (e.g., GDPR) may also be impacted if personal or sensitive data is exposed. Overall, the threat undermines both cybersecurity and physical security postures of affected organizations.

1. Network Segmentation: Restrict access to the Desigo CC event port (4998/tcp) strictly to trusted, highly protected network zones. Implement firewall rules to block access from untrusted or external networks. 2. Access Control: Enforce strict network-level access controls and VPN requirements for any remote connections to Desigo CC servers. 3. Client Integrity: Monitor and verify the integrity of installed client binaries to detect unauthorized modifications that could exploit this vulnerability. 4. Monitoring and Logging: Enable detailed logging of all requests to the event port and monitor for anomalous or unexpected SQL query patterns. 5. Vendor Coordination: Engage with Siemens for official patches or updates addressing this vulnerability and apply them promptly once available. 6. Incident Response Preparedness: Prepare incident response plans specific to building management system compromises, including isolating affected systems and forensic analysis. 7. Temporary Workarounds: If patching is not immediately possible, consider disabling or restricting the event port usage or deploying application-layer gateways that enforce authentication. 8. Security Awareness: Train facility management and IT teams on the risks associated with Desigo CC and the importance of maintaining strict network hygiene.