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AUSCERT External Security Bulletin Redistribution
ESB-2020.3584
ICS Advisory (icsa-20-289-01) Advantech WebAccess/SCADA
19 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Advantech WebAccess/SCADA
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25161
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-289-01
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ICS Advisory (ICSA-20-289-01)
Advantech WebAccess/SCADA
Original release date: October 15, 2020
Legal Notice
All information products included in https://us-cert.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://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Advantech
o Equipment: WebAccess/SCADA
o Vulnerability: External Control of File Name or Path
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
execute remote code as an administrator.
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 EXTERNAL CONTROL OF FILE NAME OR PATH CWE-73
The WADashboard component of WebAccess/SCADA may allow an attacker to control
or influence a path used in an operation on the filesystem and remotely execute
code as an administrator.
CVE-2020-25161 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 ).
3.3 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
3.4 RESEARCHER
Sivathmican Sivakumaran of Trend Micro's Zero Day Initiative reported this
vulnerability to CISA.
4. MITIGATIONS
Advantech recommends users update to Version 9.0.1 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 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 that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the 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.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.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 this vulnerability.
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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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
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Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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