CVE-2014-2246

Vulnerability

A cross-site scripting (XSS) vulnerability exists in the integrated web server of Siemens SIMATIC S7-1500 CPU programmable logic controllers (PLCs) with firmware versions prior to V1.5[1]. The flaw allows an attacker to inject arbitrary web script or HTML through unspecified vectors, indicating that user-controllable input is not properly sanitized before being rendered in a web page served by the device[1][2].

Exploitation

An unauthenticated attacker can exploit this vulnerability remotely over the network by sending a specially crafted HTTP(S) request to port 80/TCP or port 443/TCP of the affected PLC[1]. The attacker does not require any prior authentication or special privileges. Successful exploitation may require some social engineering to convince a legitimate user to visit a crafted link or interact with malicious content, but the technical vector is straightforward[1].

Impact

A successful XSS attack enables the attacker to execute arbitrary JavaScript in the context of the victim's browser session when they view the attacked page. This could lead to session hijacking, defacement of the PLC's web interface, theft of credentials, or further malicious actions performed as the authenticated user. The vulnerability compromises the confidentiality and integrity of the user's interaction with the device, potentially enabling unauthorized control actions[1].

Mitigation

Siemens released firmware version V1.5 to address this vulnerability[1]. All users of SIMATIC S7-1500 CPU family devices should update to V1.5 or later. If upgrading is not immediately possible, Siemens recommends restricting network access to the device's web server to trusted users and networks, as well as following general industrial control system security best practices[1]. No workaround other than applying the firmware patch has been provided.