CVE-2013-0671 in Wincc Tia Portal
Summary
by MITRE
Directory traversal vulnerability in Siemens WinCC (TIA Portal) 11 allows remote authenticated users to read HMI web-application source code and user-defined scripts via a crafted URL.
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Analysis
by VulDB Data Team • 01/01/2022
The vulnerability identified as CVE-2013-0671 represents a critical directory traversal flaw within Siemens WinCC (TIA Portal) version 11, specifically affecting the Human Machine Interface web application component. This weakness enables remote authenticated attackers to exploit insufficient input validation mechanisms in the web server implementation, allowing them to access sensitive files and source code that should remain restricted to authorized personnel only. The vulnerability resides in the web application layer of the WinCC system, which serves as the interface between operators and the industrial control processes, making it a prime target for malicious actors seeking to understand system internals and potentially identify additional attack vectors.
The technical exploitation of this vulnerability occurs through crafted URL requests that manipulate directory traversal sequences such as "../" or similar path manipulation techniques. When an authenticated user submits a specially crafted URL containing these traversal sequences, the web application fails to properly sanitize the input before processing file requests. This allows attackers to navigate through the file system hierarchy and access files outside the intended web root directory, including source code files, configuration scripts, and user-defined applications that contain sensitive business logic and system parameters. The flaw essentially bypasses the normal access controls and file system boundaries that should protect the web application's internal components from unauthorized access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with comprehensive insight into the HMI web application architecture and implementation details. Access to source code and user-defined scripts enables threat actors to identify potential additional vulnerabilities, understand system behavior patterns, and develop more sophisticated attack strategies. The exposure of application source code may reveal hard-coded credentials, database connection strings, and implementation flaws that could lead to further compromise of the industrial control system. Additionally, the ability to read user-defined scripts provides access to custom business logic and operational procedures that could be leveraged for targeted attacks or system disruption.
Organizations utilizing Siemens WinCC TIA Portal version 11 should implement immediate mitigations to address this vulnerability, including applying the official security patches provided by Siemens, implementing web application firewalls to filter malicious URL requests, and conducting comprehensive network segmentation to limit access to the affected systems. The vulnerability aligns with CWE-22 Directory Traversal and follows patterns consistent with ATT&CK technique T1213.002 for data from information repositories, emphasizing the need for proper input validation and access control mechanisms. Security monitoring should focus on detecting anomalous URL patterns and unauthorized file access attempts, while network administrators should consider implementing strict access controls and regular security assessments to prevent exploitation of similar vulnerabilities in industrial control systems.