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Siemens has an update available to handle improper adherence to coding standards vulnerabilities in its SCALANCE products, according to a report with CISA.

Successful exploitation of these remotely exploitable vulnerabilities, which Siemens self-reported, could lead to a denial of service or could allow an authenticated local user with physical access to the device to execute arbitrary commands.

The following Siemens SCALANCE products are affected by these vulnerabilities:
• SCALANCE SC-600: v2.0
• SCALANCE XB-200: v4.1 (only affected by CVE-2019-10927)
• SCALANCE XC-200: v4.1 (only affected by CVE-2019-10927)
• SCALANCE XF-200BA: v4.1 (only affected by CVE-2019-10927)
• SCALANCE XP-200: v4.1 (only affected by CVE-2019-10927)
• SCALANCE SR-300WG: v4.1 (only affected by CVE-2019-10927)

An authenticated attacker with network access to Port 22/TCP of an affected device may cause a denial-of-service condition. This security vulnerability could be exploited by an authenticated attacker with network access to the affected device. No user interaction is required to exploit this vulnerability. The vulnerability impacts the availability of the affected device.

Cyber Security

CVE-2019-10927 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.5.

In addition, an authenticated attacker with access to Port 22/TCP as well as physical access to an affected device may trigger the device to allow execution of arbitrary commands. The security vulnerability could be exploited by an authenticated attacker with physical access to the affected device. No user interaction is required to exploit this vulnerability. The vulnerability impacts the confidentiality, integrity, and availability of the affected device.

CVE-2019-10928 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.6.

The product sees use in the chemical, critical manufacturing, energy, food and agriculture, and water and wastewater systems sectors. It also sees action on a global basis.

No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level could leverage the issues.

Siemens currently has an update for the following product: SCALANCE SC-600.

For the balance of the listed products, Siemens is preparing further updates and recommends users apply the following specific workarounds and mitigations to reduce risk until patches are available:
Restrict access to Port 22/TCP (use the built-in firewall for SCALANCE SC-600)
Restrict physical access to the device

As a general security measure, Siemens recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for Industrial Security, and following the recommendations in the product manuals.

Click here for additional information on Industrial Security by Siemens.

For further inquiries on security vulnerabilities in Siemens products and solutions, contact the Siemens ProductCERT.

For more information on these vulnerabilities and more detailed mitigation instructions, see Siemens security advisory SSA-671286.

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