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AUSCERT External Security Bulletin Redistribution
ESB-2023.0626
Advisory (icsa-23-033-04) Delta Electronics DVW-W02W2-E2
3 February 2023
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AusCERT Security Bulletin Summary
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Product: Delta Electronics DVW-W02W2-E2
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-42139
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-23-033-04
Comment: CVSS (Max): 9.9 CVE-2022-42139 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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ICS Advisory (ICSA-23-033-04)
Delta Electronics DVW-W02W2-E2
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 9.9
o ATTENTION: Public exploit available/exploitable remotely/low attack
complexity
o Vendor: Delta Electronics
o Equipment: DVW-W02W2-E2
o Vulnerabilities: OS Command Injection
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a threat actor with
low privileges to gain root access to the device, which could then allow them
to send malicious commands to managed devices.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of DVW-W02W2-E2, an industrial ethernet router, are
affected:
o DVW-W02W2-E2: Version 2.42
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78
The web server of the affected device is vulnerable to authenticated command
injection via POST parameters. A threat actor could gain full access to the
underlying operating system (OS) of the device. If the device is acting as a
key device in an industrial network, or controls various critical equipment via
serial ports, the threat actor could cause extensive damage in the
corresponding network.
CVE-2022-42139 has been assigned to this vulnerability. A CVSS v3 base score of
9.9 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Taiwan
3.4 RESEARCHER
CISA discovered a public Proof of Concept (PoC) as authored by T. Weber of
CyberDanube Security Research, who reported it to Delta Electronics.
4. MITIGATIONS
Delta Electronics patched this vulnerability in Version 2.5.2 and recommends
all users update affected device firmware to that version or later.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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.
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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