CVE-2016-7960 in SIMATIC Step 7
Summary
by MITRE
Siemens SIMATIC STEP 7 (TIA Portal) before 14 uses an improper format for managing TIA project files during version updates, which makes it easier for local users to obtain sensitive configuration information via unspecified vectors.
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Analysis
by VulDB Data Team • 09/26/2022
The vulnerability identified as CVE-2016-7960 affects Siemens SIMATIC STEP 7 (TIA Portal) versions prior to 14, representing a critical security flaw in industrial control system software that impacts the integrity of project file handling during version updates. This issue stems from improper formatting mechanisms used when managing TIA project files, creating opportunities for unauthorized access to sensitive configuration data. The vulnerability specifically targets local users who can exploit the flawed file management processes to extract confidential information that should remain protected within the industrial automation environment.
The technical implementation of this vulnerability resides in the manner TIA Portal handles version control and project file updates, where insufficient validation and improper formatting of project data structures allows local attackers to manipulate or access sensitive configuration elements. This flaw operates at the application level within the industrial automation software ecosystem, leveraging weaknesses in how the system processes project files during upgrade operations. The improper format management creates predictable patterns or accessible data structures that can be exploited through unspecified vectors, potentially exposing critical system parameters, network configurations, or operational settings that are typically restricted to authorized personnel only.
The operational impact of this vulnerability extends beyond simple information disclosure, as it compromises the security posture of industrial control systems that rely on TIA Portal for configuration management and automation project development. Local users who can exploit this vulnerability gain access to sensitive information that may include system architecture details, communication protocols, device configurations, or other operational parameters that could be leveraged for further attacks. This represents a significant risk in industrial environments where system integrity and confidentiality are paramount, as the exposure of configuration data could enable attackers to plan more sophisticated attacks or understand system weaknesses that could lead to operational disruptions or safety hazards.
Organizations utilizing affected versions of Siemens SIMATIC STEP 7 should implement immediate mitigation measures including upgrading to TIA Portal version 14 or later, which contains the necessary patches to address the improper format management issue. Security configurations should be reviewed to limit local access privileges and implement least-privilege principles for users interacting with industrial automation systems. Network segmentation and access controls should be strengthened to prevent unauthorized local access to critical systems, while regular security assessments should be conducted to identify and remediate similar vulnerabilities in industrial control system environments. This vulnerability aligns with CWE-200 (Information Exposure) and represents a significant concern for organizations operating within the industrial control systems domain, where the ATT&CK framework would categorize this under initial access and credential access tactics due to the local privilege escalation potential and information gathering capabilities it provides to adversaries.
The broader implications of this vulnerability highlight the importance of proper input validation and secure coding practices in industrial automation software, particularly when handling sensitive configuration data during system operations. Organizations should consider implementing comprehensive security awareness programs for industrial control system administrators and establish robust change management processes that include security reviews of software updates and modifications. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in industrial control system environments, ensuring that security measures remain effective against evolving threats in the industrial cybersecurity landscape.