Schweitzer Engineering Laboratories SEL-411L

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1. EXECUTIVE SUMMARY

• CVSS v3 4.3
• ATTENTION: Exploitable remotely/low attack complexity
• Vendor: Schweitzer Engineering Laboratories
• Equipment: SEL-411L
• Vulnerability: Improper Restriction of Rendered UI Layers or Frames

2. RISK EVALUATION

Successful exploitation of this vulnerability could expose authorized users to clickjacking attacks.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of the Schweitzer Engineering Laboratories SEL-411L are affected:

• R118: V0 - V3
• R119: V0 - V4
• R120: V0 - V5
• R121: V0 - V2
• R122: V0 - V2
• R123: V0 - V2
• R124: V0 - V2
• R125: V0 - V2
• R126: V0 - V3
• R127: V0 - V1
• R128: V0
• R129: V0

3.2 Vulnerability Overview

3.2.1 IMPROPER RESTRICTION OF RENDERED UI LAYERS OR FRAMES CWE-1021

An Improper Restriction of Rendered UI Layers or Frames in the Schweitzer Engineering Laboratories SEL-411L could allow an unauthenticated attacker to perform clickjacking-based attacks against an authenticated and authorized user.

CVE-2023-2265 has been assigned to this vulnerability. A CVSS v3.1 base score of 4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Energy
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Sushant Mane, Parul Sindhwad, Imran Jamadar, and Dr. Faruk Kazi of CoE-CNDS Lab, VJTI, Mumbai, India reported this vulnerability to Schweitzer Engineering Laboratories.

4. MITIGATIONS

Schweitzer Engineering Laboratories has distributed patches to appropriate asset owners. Please refer to their security advisory for more information.

Schweitzer Engineering Laboratories also recommends users see product Instruction Manual Appendix A dated 20230830 for more details.

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), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is 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/ics. 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/ics 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

• December 07, 2023: Initial Publication

• Schweitzer Engineering Laboratories