CVE-2016-5744 in SIMATIC WinCC
Summary
by MITRE
Siemens SIMATIC WinCC 7.0 through SP3 and 7.2 allows remote attackers to read arbitrary WinCC station files via crafted packets.
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Analysis
by VulDB Data Team • 09/09/2022
The vulnerability identified as CVE-2016-5744 affects Siemens SIMATIC WinCC versions 7.0 through SP3 and 7.2, representing a critical security flaw in industrial control system software. This vulnerability resides within the WinCC station file access mechanism, which is part of Siemens' comprehensive SCADA (Supervisory Control and Data Acquisition) platform used extensively in industrial automation environments. The affected systems operate in critical infrastructure sectors including manufacturing, energy, and water treatment facilities where operational technology (OT) security is paramount.
The technical flaw stems from insufficient input validation and access control mechanisms within the WinCC communication protocols. Attackers can exploit this weakness by crafting specially designed network packets that bypass normal authentication and authorization checks. The vulnerability specifically targets the WinCC station file access functionality, which stores configuration data, user credentials, and operational parameters essential for system operation. This allows remote attackers to access sensitive station files without proper authorization, potentially exposing critical system information that could be leveraged for further attacks.
The operational impact of this vulnerability is severe for industrial environments where WinCC systems control critical processes. Remote access to station files could enable attackers to extract system configurations, user credentials, and operational parameters that provide deep insights into the industrial control network architecture. This information could facilitate more sophisticated attacks including system disruption, data manipulation, or lateral movement within the industrial network. The vulnerability particularly affects environments where physical security controls may be insufficient, as attackers can exploit this remotely without requiring physical access to the systems.
Mitigation strategies for CVE-2016-5744 should include immediate deployment of Siemens security patches and updates specifically addressing this vulnerability. Organizations should implement network segmentation to isolate WinCC systems from general corporate networks, utilizing firewalls and network access controls to restrict communication to only necessary endpoints. The implementation of secure network protocols and encryption for all communication channels between WinCC stations and management systems is essential. Additionally, regular security assessments and monitoring of network traffic for suspicious packet patterns should be established to detect potential exploitation attempts. This vulnerability aligns with CWE-284 (Improper Access Control) and represents a significant concern for industrial control system security, potentially mapping to ATT&CK technique T1071.004 (Application Layer Protocol: DNS) and T1566 (Phishing) when considering the potential for initial access through crafted network communications. Organizations should also conduct comprehensive risk assessments to understand the full attack surface and implement defense-in-depth strategies to protect their critical infrastructure assets.