Siemens SCALANCE W700

As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemens' ProductCERT Security Advisories (CERT Services | Services | Siemens Global). 

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1. EXECUTIVE SUMMARY

• CVSS v4 9.4
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Siemens
• Equipment: SCALANCE W700
• Vulnerability: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an authenticated remote attacker with administrative privileges to inject code or spawn a system root shell.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that the following SCALANCE W700 802.11 AX Family products are affected:

• SCALANCE WAB762-1 (6GK5762-1AJ00-6AA0): All versions prior to V2.4.0
• SCALANCE WAM763-1 (6GK5763-1AL00-7DA0): All versions prior to V2.4.0
• SCALANCE WAM763-1 (ME) (6GK5763-1AL00-7DC0): All versions prior to V2.4.0
• SCALANCE WAM763-1 (US) (6GK5763-1AL00-7DB0): All versions prior to V2.4.0
• SCALANCE WAM766-1 (EU) (6GK5766-1GE00-7DA0): All versions prior to V2.4.0
• SCALANCE WAM766-1 (ME) (6GK5766-1GE00-7DC0): All versions prior to V2.4.0
• SCALANCE WAM766-1 (US) (6GK5766-1GE00-7DB0): All versions prior to V2.4.0
• SCALANCE WAM766-1 EEC (EU) (6GK5766-1GE00-7TA0): All versions prior to V2.4.0
• SCALANCE WAM766-1 EEC (ME) (6GK5766-1GE00-7TC0): All versions prior to V2.4.0
• SCALANCE WAM766-1 EEC (US) (6GK5766-1GE00-7TB0): All versions prior to V2.4.0
• SCALANCE WUB762-1 (6GK5762-1AJ00-1AA0): All versions prior to V2.4.0
• SCALANCE WUB762-1 (6GK5762-1AJ00-2AA0): All versions prior to V2.4.0
• SCALANCE WUM763-1 (6GK5763-1AL00-3AA0): All versions prior to V2.4.0
• SCALANCE WUM763-1 (6GK5763-1AL00-3DA0): All versions prior to V2.4.0
• SCALANCE WUM763-1 (US) (6GK5763-1AL00-3AB0): All versions prior to V2.4.0
• SCALANCE WUM763-1 (US) (6GK5763-1AL00-3DB0): All versions prior to V2.4.0
• SCALANCE WUM766-1 (EU) (6GK5766-1GE00-3DA0): All versions prior to V2.4.0
• SCALANCE WUM766-1 (ME) (6GK5766-1GE00-3DC0): All versions prior to V2.4.0
• SCALANCE WUM766-1 (US) (6GK5766-1GE00-3DB0): All versions prior to V2.4.0

3.2 Vulnerability Overview

3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS IN OUTPUT USED BY A DOWNSTREAM COMPONENT ('INJECTION') CWE-74

Affected devices do not properly sanitize an input field. This could allow an authenticated remote attacker with administrative privileges to inject code or spawn a system root shell. Follow-up of CVE-2022-36323.

CVE-2023-44373 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).

A CVSS v4 score has also been calculated for CVE-2023-44373. A base score of 9.4 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Chemical Sector, Critical Manufacturing, Energy Sector, Nuclear Reactors, Materials, and Waste Sector
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

Siemens has released new versions for the affected products and recommends to update to V2.4.0 or later version.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-721642 in HTML and CSAF.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as:

• Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
• Locate control system networks and remote devices behind firewalls and isolating them from business networks.
• When remote access is required, use more secure methods, such as virtual private networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

5. UPDATE HISTORY

• September 12, 2024: Initial Publication

• Siemens