CVE-2016-9160 in SIMATIC WinCC
Summary
by MITRE
A vulnerability in SIEMENS SIMATIC WinCC (All versions < SIMATIC WinCC V7.2) and SIEMENS SIMATIC PCS 7 (All versions < SIMATIC PCS 7 V8.0 SP1) could allow a remote attacker to crash an ActiveX component or leak parts of the application memory if a user is tricked into clicking on a malicious link under certain conditions.
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Analysis
by VulDB Data Team • 10/12/2022
The vulnerability identified as CVE-2016-9160 represents a critical security flaw affecting Siemens industrial automation software products including SIMATIC WinCC and SIMATIC PCS 7. This vulnerability resides within the ActiveX component implementation of these industrial control system applications, creating a remote code execution risk that could severely impact operational technology environments. The flaw specifically affects versions prior to SIMATIC WinCC V7.2 and SIMATIC PCS 7 V8.0 SP1, indicating that organizations running these older versions remain exposed to potential exploitation. The vulnerability is particularly concerning in industrial settings where these systems control critical infrastructure operations and where the attack surface extends beyond traditional IT networks into operational technology domains.
The technical nature of this vulnerability stems from improper input validation within the ActiveX component handling mechanisms of Siemens industrial software. When a user clicks on a malicious link, the system fails to properly sanitize input parameters before processing them through the ActiveX interface. This leads to either a denial of service condition where the ActiveX component crashes or memory disclosure issues where sensitive application memory contents are leaked. The memory leak aspect of this vulnerability is particularly dangerous as it could expose sensitive operational data, system configurations, or authentication credentials that might be stored in memory. The vulnerability operates through a classic buffer overflow or improper memory handling pattern that allows attackers to manipulate the component's execution flow, potentially leading to more severe exploitation outcomes.
The operational impact of CVE-2016-9160 extends beyond simple system disruption to potentially compromise the integrity of industrial control systems. In industrial environments where these systems control manufacturing processes, power generation, or other critical operations, a successful exploitation could result in production downtime, safety hazards, or even physical damage to equipment. The remote nature of the attack means that threat actors can target these systems from outside the operational technology network, potentially bypassing traditional network security controls that might protect IT systems. Organizations utilizing these Siemens products face significant risk exposure, particularly in environments where user interaction with potentially malicious links cannot be fully controlled, such as in environments with web-based interfaces or email systems that might contain compromised links.
Organizations should implement immediate mitigation strategies to address this vulnerability, beginning with upgrading to supported versions of SIMATIC WinCC V7.2 and SIMATIC PCS 7 V8.0 SP1 where available. Network segmentation and access controls should be strengthened to limit user access to potentially vulnerable systems, particularly those that might be exposed to external threats through web interfaces or email systems. The implementation of web application firewalls and content filtering solutions can help prevent users from accessing malicious links that could trigger this vulnerability. Additionally, security awareness training should be conducted to educate users about the risks of clicking on untrusted links, especially in environments where such attacks might be attempted. From a compliance perspective, this vulnerability aligns with various industrial security standards including IEC 62443 and NIST Cybersecurity Framework, which emphasize the importance of maintaining up-to-date security controls and addressing known vulnerabilities in industrial control systems. The vulnerability also maps to ATT&CK technique T1203 - Exploitation for Client Execution, highlighting the need for organizations to implement defenses against client-side exploitation techniques that target ActiveX components and other browser-based technologies.