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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-075-01) Advantech WebAccess/SCADA
17 March 2021
AusCERT Security Bulletin Summary
Product: Advantech WebAccess/SCAD
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2021-27436
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ICS Advisory (ICSA-21-075-01)
Original release date: March 16, 2021
All information products included in https://us-cert.cisa.gov/ics are provided
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(DHS) does not provide any warranties of any kind regarding any information
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1. EXECUTIVE SUMMARY
o CVSS v3 5.4
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Advantech
o Equipment: WebAccess/SCADA
o Vulnerability: Cross-site Scripting
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an unauthorized user
to steal a user's cookie/session token or redirect an authorized user to a
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of WebAccess/SCADA, a browser-based SCADA software
package, are affected:
o WebAccess/SCADA Versions 9.0 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
The affected product is vulnerable to cross-site scripting, which may allow an
result in hijacking of the user's cookie/session tokens, redirecting the user
to a malicious webpage and performing unintended browser actions.
CVE-2021-27436 has been assigned to this vulnerability. A CVSS v3 base score of
5.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
o COUNTRIES/AREAS DEPLOYED: East Asia, Europe, United States
o COMPANY HEADQUARTERS LOCATION: Taiwan
Chizuru Toyama of TXOne IoT/ICS Security Research Labs of Trend Micro reported
this vulnerability to CISA.
Advantech recommends users update to Version 9.0.1 or later.
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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
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 this vulnerability.
For any questions related to this report, please contact the CISA at:
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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