CVE-2011-4513 in SIMATIC HMI panel
Summary
by MITRE
Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime allow user-assisted remote attackers to execute arbitrary code via a crafted project file, related to the HMI web server and runtime loader.
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Analysis
by VulDB Data Team • 11/29/2021
This vulnerability affects Siemens WinCC flexible versions 2004 through 2008, WinCC V11 (TIA Portal), and various SIMATIC HMI panels including TP, OP, MP, Comfort Panels, and Mobile Panels. The flaw exists in the HMI web server and runtime loader components that process project files, creating a critical remote code execution vector. Attackers can exploit this vulnerability by crafting malicious project files that, when loaded by the affected software, trigger arbitrary code execution on the target system. The vulnerability is particularly dangerous because it operates through user-assisted remote attack vectors, meaning an attacker can convince a user to open a malicious project file, which then executes code on the victim's system. This represents a significant security weakness in industrial control systems where operational technology environments are often isolated but not immune to such attacks.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the project file processing mechanisms of Siemens HMI software. When the runtime loader processes a crafted project file, it fails to properly validate the file contents, allowing malicious code embedded within the project structure to be executed with the privileges of the running process. This type of vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow conditions. The vulnerability also aligns with ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain remote access, and T1059, which covers command and script injection techniques. The flaw essentially creates a pathway for attackers to bypass normal security controls and execute malicious payloads directly within the industrial control environment.
The operational impact of this vulnerability extends beyond simple code execution, as it can compromise entire industrial control systems that rely on Siemens WinCC for monitoring and control operations. Attackers could potentially gain persistent access to critical infrastructure, modify operational parameters, or disrupt production processes. The vulnerability affects both the development environment (WinCC flexible) and runtime environments (WinCC V11 Runtime Advanced), meaning that both engineers working with project files and end users operating the systems could be targeted. This creates a particularly dangerous scenario for industrial environments where system availability and integrity are paramount, as the attack could originate from outside the industrial network or be introduced through legitimate software updates. The affected HMI panels, particularly the mobile and comfort panels, could serve as attack vectors for targeting industrial control systems in manufacturing and process control environments.
Organizations should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of all affected Siemens WinCC installations. The vulnerability affects multiple versions and product lines, so comprehensive inventory assessment is required to identify all potentially affected systems. Network segmentation should be implemented to isolate HMI systems from general enterprise networks, reducing the attack surface for remote exploitation. Access controls must be strengthened to ensure that only authorized personnel can access and modify project files, implementing principle of least privilege for HMI system access. Additionally, regular security assessments should include testing for similar vulnerabilities in industrial control systems, as this vulnerability represents a common pattern in OT environments. System monitoring should be enhanced to detect unusual project file access patterns or unauthorized modifications to HMI configurations. The mitigation strategy should also include regular security awareness training for personnel working with industrial control systems to recognize potential social engineering attacks that could lead to exploitation of this vulnerability.