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Cisco released security advisories to address vulnerabilities affecting Cisco NX-OS Software. A cyber threat actor could exploit one of these vulnerabilities to cause a denial-of-service condition.

CISA encourages users and administrators to review the following advisories and apply the necessary updates:

Cisco NX-OS Software MPLS Encapsulated IPv6 Denial of Service Vulnerability

Cisco NX-OS Software External Border Gateway Protocol Denial of Service Vulnerability

View CSAF

1. EXECUTIVE SUMMARY

• CVSS v3 7.8
• ATTENTION: Low attack complexity
• Vendor: Delta Electronics
• Equipment: CNCSoft-B
• Vulnerability: Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Delta Electronics products are affected:

• CNCSoft-B: Versions 1.0.0.4 and prior

3.2 Vulnerability Overview

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121

Delta Electronics CNCSoft-B versions 1.0.0.4 and prior are vulnerable to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code.

CVE-2024-1941 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.8 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

• CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Taiwan

3.4 RESEARCHER

Natnael Samson (@NattiSamson) working with Trend Micro Zero Day Initiative reported this vulnerability to CISA.

4. MITIGATIONS

Delta recommends users update to CNCSoft-B V 1.0.0.4 with Issue Date 2024-01-23 or later.

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

• February 29, 2024: Initial Publication