• Enable Structured Exception Handling Overwrite Protection (SEHOP) in your Windows Operating System where COMOS is installed to protect against code execution. However, the application is still vulnerable to denial of service attacks

Please follow the General Security Recommendations.

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS environmental score is specific to the customer’s environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at: https://cwe.mitre.org/.

This vulnerability has been discovered internally by Siemens.

Updated general product information and user manuals are available on SIOS Portal: https://support.industry.siemens.com/cs/ww/en/view/109739837.
Please also consider the Security-relevant configuration for COMOS: https://support.industry.siemens.com/cs/ww/en/view/109815213/.

https://www.siemens.com/cert/advisories