Crestron AM-300

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1. EXECUTIVE SUMMARY

• CVSS v3 8.4
• ATTENTION: Low attack complexity
• Vendor: Crestron
• Equipment: AM-300
• Vulnerability: OS Command Injection

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to escalate their privileges to root-level access.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Crestron AirMedia Presentation System products are affected:

• AM-300: Version 1.4499.00018

3.2 Vulnerability Overview

3.2.1 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

There is an OS command injection vulnerability in Crestron AM-300 firmware version 1.4499.00018 which may enable a user of a limited-access SSH session to escalate their privileges to root-level access.

CVE-2023-6926 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.4 has been calculated; the CVSS vector string is AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

3.3 BACKGROUND

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

3.4 RESEARCHER

Uri Katz of Claroty Research Team82 reported this vulnerability to CISA.

4. MITIGATIONS

Crestron has resolved this vulnerability in firmware version 1.4499.00023.001 or higher. Please see https://security.crestron.com or contact True Blue Support for additional information.

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. This vulnerability is not exploitable remotely.

5. UPDATE HISTORY

• January 23, 2024: Initial Publication

• Crestron