CVE-2011-4511 in SIMATIC HMI panel
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime allows remote attackers to inject arbitrary web script or HTML via unspecified vectors, a different vulnerability than CVE-2011-4510.
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Analysis
by VulDB Data Team • 11/29/2021
The CVE-2011-4511 vulnerability represents a critical cross-site scripting flaw within Siemens HMI web server implementations across multiple WinCC products and HMI panels. This vulnerability affects a broad range of industrial automation systems including WinCC flexible versions 2004 through 2008, WinCC V11 (TIA Portal) before SP2 Update 1, various SIMATIC HMI panels such as TP, OP, MP, Comfort Panels, and Mobile Panels, along with WinCC V11 Runtime Advanced and WinCC flexible Runtime environments. The flaw resides in the web server component that handles user input and renders web content, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of authenticated user sessions.
The technical nature of this vulnerability stems from inadequate input validation and output encoding within the HMI web server's handling of user-supplied data. Attackers can exploit this weakness through unspecified vectors that likely involve manipulating web form inputs, URL parameters, or other data entry points within the HMI web interface. The vulnerability classifies under CWE-79 as Cross-Site Scripting, specifically targeting the web application layer where user-controllable data is improperly sanitized before being rendered to web browsers. This weakness allows attackers to inject malicious scripts that can execute in the browser context of legitimate users who interact with the compromised HMI system, potentially leading to session hijacking, data exfiltration, or further system compromise.
The operational impact of CVE-2011-4511 is particularly severe in industrial control environments where HMI systems serve as critical interfaces for monitoring and controlling industrial processes. Remote attackers who successfully exploit this vulnerability can gain unauthorized access to HMI web interfaces, potentially manipulating process controls, viewing sensitive operational data, or establishing persistent access points within industrial networks. The attack surface extends beyond simple web interface manipulation to include potential lateral movement within industrial networks, as HMI systems often serve as gateways to broader control system architectures. This vulnerability directly aligns with ATT&CK technique T1566 for initial access through web application attacks, and T1071 for application layer protocol usage, making it a significant concern for industrial cybersecurity frameworks.
Mitigation strategies for this vulnerability require immediate patching of affected Siemens products to SP3 for WinCC flexible versions and SP2 Update 1 for WinCC V11. Organizations should implement network segmentation to isolate HMI systems from general corporate networks, deploy web application firewalls to monitor and filter malicious web traffic, and conduct regular security assessments of industrial web interfaces. Additional defensive measures include implementing strict input validation controls, disabling unnecessary web services, and establishing robust monitoring for suspicious web access patterns. The vulnerability demonstrates the importance of maintaining up-to-date industrial control system security patches and highlights the need for comprehensive security testing of web-based industrial interfaces. Organizations should also consider implementing zero-trust network architectures for industrial environments and establish incident response procedures specifically tailored for industrial control system security events.