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AUSCERT External Security Bulletin Redistribution
ESB-2023.0627
Advisory (icsa-23-033-05) Delta Electronics DX-2100-L1-CN
3 February 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Delta Electronics DX-2100-L1-CN
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-0432 CVE-2022-42140
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-23-033-05
Comment: CVSS (Max): 9.0 CVE-2023-0432 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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:R/S:C/C:H/I:H/A:H
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ICS Advisory (ICSA-23-033-05)
Delta Electronics DX-2100-L1-CN
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 9.0
o ATTENTION: Public exploits available/exploitable remotely/low attack
complexity
o Vendor: Delta Electronics
o Equipment: DX-2100-L1-CN
o Vulnerabilities: OS Command Injection, Cross-site Scripting
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker with
low privileges to gain root access or allow an unauthenticated attacker to
perform remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of DX-2100-L1-CN, an industrial ethernet router, are
affected:
o DX-2100-L1-CN: Version 1.5.0.10
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS
COMMAND INJECTION') CWE-78
The web configuration service of the affected device contains an authenticated
command injection vulnerability. It can be used to execute system commands on
the operating system (OS) from the device in the context of the user "root." If
the attacker has credentials for the web service, then the device could be
fully compromised.
CVE-2022-42140 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The affected device contains a stored cross-site scripting vulnerability in the
"net diagnosis" function in the web configuration service. This can be
exploited in the context of a victim's session. An attacker could deliver a
large variety of payloads that could lead to possibilities, such as remote code
execution.
CVE-2023-0432 has been assigned to this vulnerability. A CVSS v3 base score of
9.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:R/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 1.5.0.12 and recommends
all users update device firmware to that version or later.
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.
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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