CVE-2014-4685 in WinCC
Summary
by MITRE
Siemens SIMATIC WinCC before 7.3, as used in PCS7 and other products, allows local users to gain privileges by leveraging weak system-object access control.
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Analysis
by VulDB Data Team • 03/26/2022
The vulnerability identified as CVE-2014-4685 affects Siemens SIMATIC WinCC versions prior to 7.3, specifically within the PCS7 and related industrial control systems. This flaw represents a critical privilege escalation vulnerability that exploits weak system-object access control mechanisms within the WinCC runtime environment. The vulnerability resides in the core access control implementation that governs how system objects are managed and accessed within the industrial automation platform.
The technical exploitation of this vulnerability occurs through local user manipulation of system objects that should normally be protected from unauthorized access or modification. Attackers with local system access can leverage the insufficient access control checks to elevate their privileges and gain administrative-level access to the WinCC runtime environment. This weakness stems from inadequate object-level permissions and access control enforcement mechanisms that fail to properly validate user credentials and authorization levels when accessing critical system components.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the integrity and security of industrial control systems. An attacker who successfully exploits this vulnerability can potentially manipulate critical process control data, modify system configurations, or gain unauthorized access to sensitive operational information. This poses significant risks to industrial environments where system integrity and operational security are paramount, as the compromised system could lead to unauthorized process modifications, data tampering, or complete system compromise.
The vulnerability aligns with CWE-284, which describes improper access control in software systems, and represents a classic case of insufficient authorization checks in industrial control environments. From an attack perspective, this weakness enables adversaries to move laterally within industrial networks and potentially compromise the broader operational technology infrastructure. The ATT&CK framework categorizes this as a privilege escalation technique, specifically leveraging local system access to gain elevated privileges within the industrial control environment.
Mitigation strategies should focus on immediate patching of affected WinCC installations to version 7.3 or later, which includes enhanced access control mechanisms and proper object-level permission enforcement. Organizations should also implement comprehensive access control policies that limit local user privileges and establish proper network segmentation between operational technology and corporate networks. Regular security assessments of industrial control systems, including vulnerability scanning and access control reviews, should be conducted to identify and remediate similar weaknesses in industrial automation environments. Additionally, implementing principle of least privilege for all system users and maintaining detailed audit logs of system object access and modifications can help detect and prevent exploitation attempts.