Operating System:

[Appliance]

Published:

03 February 2023

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.0625
           Advisory (icsa-23-033-01) Delta Electronics DIAScreen
                              3 February 2023

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Delta Electronics DIAScreen
Publisher:         ICS-CERT
Operating System:  Network Appliance
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-0251 CVE-2023-0250 CVE-2023-0249

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-23-033-01

Comment: CVSS (Max):  7.8 CVE-2023-0251 (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
         CVSS Source: ICS-CERT
         Calculator:  https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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ICS Advisory (ICSA-23-033-01)

Delta Electronics DIAScreen

Original release date: February 02, 2023

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.8
  o ATTENTION: Low attack complexity
  o Vendor: Delta Electronics
  o Equipment: DIAScreen
  o 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:

  o 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

  o CRITICAL INFRASTRUCTURE SECTORS: Energy
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o 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:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure they are not accessible from the Internet .
  o Locate control system networks and remote devices behind firewalls and
    isolate them from business networks.
  o 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 .

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 exploits specifically target these vulnerabilities. These
vulnerabilities are not exploitable remotely.

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.

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