CVE-2014-1698 in SIMATIC Wincc Open Architecture
Summary
by MITRE
Directory traversal vulnerability in Siemens SIMATIC WinCC OA before 3.12 P002 January allows remote attackers to read arbitrary files via crafted packets to TCP port 4999.
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Analysis
by VulDB Data Team • 02/01/2022
The vulnerability identified as CVE-2014-1698 represents a critical directory traversal flaw in Siemens SIMATIC WinCC OA software versions prior to 3.12 P002 January release. This vulnerability specifically affects the communication protocol implementation on TCP port 4999, which serves as the primary interface for WinCC OA's remote communication capabilities. The flaw stems from insufficient input validation mechanisms within the application's packet processing logic, allowing malicious actors to manipulate file path references through crafted network packets. This directory traversal vulnerability enables unauthorized access to sensitive system files and data that should remain protected within the application's secure boundaries.
The technical implementation of this vulnerability resides in the application layer of the WinCC OA system, where network packets received on port 4999 are processed without adequate sanitization of file path parameters. Attackers can exploit this weakness by constructing specially crafted packets that contain directory traversal sequences such as "../" or similar path manipulation techniques. These malformed packets, when processed by the vulnerable WinCC OA application, cause the system to navigate outside its intended file access boundaries and retrieve files from arbitrary locations on the filesystem. The vulnerability operates at the application protocol level and directly impacts the integrity of the system's file access controls, potentially exposing configuration files, user credentials, and other sensitive operational data.
From an operational perspective, this vulnerability poses significant risks to industrial control systems running Siemens WinCC OA software, particularly those connected to corporate networks or internet-facing environments. The remote attack vector eliminates the need for physical access or local network presence, making the system vulnerable to exploitation from anywhere on the network. Successful exploitation can lead to complete system compromise, unauthorized data access, and potential disruption of critical industrial processes. The impact extends beyond simple information disclosure, as attackers may be able to extract configuration details that could aid in further attacks or gain insights into the industrial control system architecture. This vulnerability aligns with CWE-22, which categorizes directory traversal issues as a fundamental weakness in input validation and access control mechanisms.
The exploitation of this vulnerability can result in substantial operational disruptions and security breaches within industrial environments where WinCC OA systems are deployed. Organizations may face regulatory compliance issues, operational downtime, and potential safety risks if critical control systems are compromised. The vulnerability's presence in industrial control systems highlights the importance of secure configuration management and regular patching of operational technology components. Security professionals should consider implementing network segmentation to isolate these systems and monitor traffic on TCP port 4999 for suspicious activity. The remediation approach requires immediate deployment of the official Siemens patch available for version 3.12 P002 January, which addresses the input validation flaw and implements proper file path sanitization. Additionally, organizations should conduct comprehensive vulnerability assessments of their industrial control system environments to identify and remediate similar weaknesses in other operational technology components, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in remote services and T1071 for application layer protocol usage.