1. EXECUTIVE SUMMARY

  • CVSS v3 7.8
  • ATTENTION: Low attack complexity 
  • Vendor: Delta Electronics 
  • Equipment: DIAScreen 
  • Vulnerabilities: Stack-based Buffer Overflow, Improper Restriction of Operations within the Bounds of a Memory Buffer, Out-of-bounds Write 

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow remote code execution. 

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of DIAScreen, a software configuration tool for Delta devices, are affected: 

  • DIAScreen: versions 1.2.1.23 and prior 

3.2 VULNERABILITY OVERVIEW

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 

Delta Electronics DIAScreen versions 1.2.1.23 and prior are vulnerable to a stack-based buffer overflow, which could allow an attacker to remotely execute arbitrary code. 

CVE-2023-0250 has been assigned to this vulnerability. A CVSS v3 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). 

3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 

Delta Electronics DIAScreen versions 1.2.1.23 and prior are vulnerable to a buffer overflow through improper restrictions of operations within memory, which could allow an attacker to remotely execute arbitrary code. 

CVE-2023-0251 has been assigned to this vulnerability. A CVSS v3 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). 

3.2.3 OUT-OF-BOUNDS WRITE CWE-787 

Delta Electronics DIAScreen versions 1.2.1.23 and prior are vulnerable to an out-of-bounds write, which could allow an attacker to remotely execute arbitrary code. 

CVE-2023-0249 has been assigned to this vulnerability. A CVSS v3 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: Energy 
  • COUNTRIES/AREAS DEPLOYED: Worldwide 
  • COMPANY HEADQUARTERS LOCATION: Taiwan 

3.4 RESEARCHER

Natnael Samson (@NattiSamson), working with Trend Micro’s Zero Day Initiative, reported these vulnerabilities to CISA. 

4. MITIGATIONS

Delta Electronics released version 1.3.0 of DIAScreen (login required) and recommends users install this update on all affected systems. 

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

  • Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet.
  • Locate control system networks and remote devices behind firewalls and isolate them from business networks.
  • When remote access is required, use 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 its 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 at 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.

Source:
https://www.cisa.gov/uscert/ics/advisories/icsa-23-033-01