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AUSCERT External Security Bulletin Redistribution
ESB-2021.2165.2
Advisory (icsa-21-168-03) Advantech WebAccess/SCADA
25 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Advantech WebAccess/SCADA
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-32956 CVE-2021-32954
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-168-03
Revision History: August 25 2021: Vendor added version update details
June 18 2021: Initial Release
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ICS Advisory (ICSA-21-168-03)
Advantech WebAccess/SCADA (Update A)
Original release date: August 24, 2021
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 7.3
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Advantech
o Equipment: WebAccess/SCADA
o Vulnerabilities: Open Redirect, Relative Path Traversal
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-21-168-03 Advantech WebAccess/SCADA that was published June 17, 2021, to
the ICS webpage on us-cert.cisa.gov.
3. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
read files outside the intended directory or redirect a user to a malicious
webpage.
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following versions of Advantech WebAccess/SCADA, a browser-based SCADA
software package, are affected:
o WebAccess/SCADA Versions 9.0.1 and prior
4.2 VULNERABILITY OVERVIEW
4.2.1 URL REDIRECTION TO UNTRUSTED SITE ('OPEN REDIRECT') CWE-601
The affected product is vulnerable to redirection, which may allow an attacker
to send a maliciously crafted URL that could result in redirecting a user to a
malicious webpage.
CVE-2021-32956 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L ).
4.2.2 RELATIVE PATH TRAVERSAL CWE-23
The affected product is vulnerable to a directory traversal, which may allow an
attacker to remotely read arbitrary files on the file system.
CVE-2021-32954 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:N/A:N ).
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: East Asia, Europe, United States
o COMPANY HEADQUARTERS LOCATION: Taiwan
4.4 RESEARCHER
Chizuru Toyama of TXOne IoT/ICS Security Research Labs, working with Trend
Micro's Zero Day Initiative, reported these vulnerabilities to CISA.
5. MITIGATIONS
- --------- Begin Update A Part 1 of 1 ---------
Advantech recommends users upgrade to any version after v9.0.1
- --------- End Update A Part 1 of 1 ---------
For more information, contact Advantech via website or phone (1-888-576-9668).
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 that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
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 on us-cert.cisa.gov . Several recommended 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 on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
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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The University of Queensland
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