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
- CVSS v3 7.3
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Advantech
- Equipment: WebAccess/SCADA
- 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:
- WebAccess/SCADA Versions 9.0.1 and prior
4.2 VULNERABILITY OVERVIEW
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.
The affected product is vulnerable to a directory traversal, which may allow an attacker to remotely read arbitrary files on the file system.
- CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and Wastewater Systems
- COUNTRIES/AREAS DEPLOYED: East Asia, Europe, United States
- COMPANY HEADQUARTERS LOCATION: Taiwan
Chizuru Toyama of TXOne IoT/ICS Security Research Labs, working with Trend Micro’s Zero Day Initiative, reported these vulnerabilities to CISA.
--------- 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:
- Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
- 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:
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.
Please share your thoughts.
We recently updated our anonymous product survey; we'd welcome your feedback.