CISA Advisory: Deep Sea Electronics DSE855 | CISA

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1. EXECUTIVE SUMMARY

• CVSS v4 7.1
• ATTENTION: low attack complexity/public exploits are available
• Vendor: Deep Sea Electronics
• Equipment: DSE855
• Vulnerability: Missing Authentication for Critical Function

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to access stored credentials.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Deep Sea Electronics DSE855, an ethernet communications device, are affected:

3.2 Vulnerability Overview

3.2.1 Missing Authentication for Critical Function CWE-306

Deep Sea Electronics DSE855 is vulnerable to a configuration disclosure when direct object reference is made to the Backup.bin file using an HTTP GET request.

CVE-2024-5947 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

A CVSS v4 score has also been calculated for CVE-2024-5947. A base score of 7.1 has been calculated; the CVSS vector string is (CVSS4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N).

3.3 BACKGROUND

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

3.4 RESEARCHER

CISA discovered this vulnerability authored by Gjoko Krstic.

4. MITIGATIONS

Deep Sea Electronics recommends that users update DSE855 to version 1.2.0.

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

• October 24, 2024: Initial Publication