CVE-2014-4684 in WinCC
Summary
by MITRE
The database server in Siemens SIMATIC WinCC before 7.3, as used in PCS7 and other products, allows remote authenticated users to gain privileges via a request to TCP port 1433.
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Analysis
by VulDB Data Team • 03/26/2022
The vulnerability identified as CVE-2014-4684 affects Siemens SIMATIC WinCC database server components versions prior to 7.3, specifically impacting industrial control systems deployed in process control systems such as PCS7. This security flaw exists within the database server implementation that operates on TCP port 1433, which is traditionally associated with Microsoft SQL Server but in this context represents a proprietary Siemens implementation. The vulnerability is classified as a privilege escalation issue that can be exploited by authenticated remote attackers who have already gained access to the system through legitimate means.
The technical nature of this vulnerability stems from insufficient access control mechanisms within the WinCC database server component. When authenticated users send specific requests to TCP port 1433, they can manipulate the system to elevate their privileges beyond their intended access levels. This represents a critical flaw in the principle of least privilege that is fundamental to secure system design and aligns with CWE-276, which addresses incorrect permissions for critical resources. The vulnerability demonstrates poor input validation and authorization checks within the database server communication layer, allowing attackers to exploit legitimate authentication mechanisms to achieve unauthorized access to higher privilege levels.
The operational impact of this vulnerability in industrial environments is particularly concerning as it can be leveraged to compromise the integrity and availability of critical process control systems. An attacker who has already established initial access to a WinCC system can use this privilege escalation to gain administrative control over the database server, potentially leading to data manipulation, system disruption, or unauthorized configuration changes that could affect production processes. This vulnerability directly impacts the security posture of industrial control systems and aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation' and T1566, which addresses 'Phishing for Information', as attackers might use legitimate access to establish a foothold before escalating privileges.
Organizations using affected Siemens SIMATIC WinCC systems should implement immediate mitigations including updating to version 7.3 or later, which contains the necessary security patches to address this privilege escalation vulnerability. Network segmentation should be implemented to restrict access to TCP port 1433, and access controls should be strictly enforced using role-based access control mechanisms. Additionally, monitoring and logging of database server activities should be enhanced to detect anomalous privilege escalation attempts. The vulnerability highlights the importance of maintaining current security patches in industrial control environments and demonstrates how seemingly minor access control flaws can have significant implications for operational technology security. This issue underscores the critical need for comprehensive security assessments of industrial control systems and proper implementation of defense-in-depth strategies to protect against such sophisticated attacks that can compromise the integrity of critical infrastructure.