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TLP:WHITE
TLP:WHITE
 1. Industrial Control Systems    >
 2. ICS-CERT Advisories    >
 3. Advantech WebAccess

More ICS-CERT Advisories


ICS ADVISORY (ICSA-21-285-02)


ADVANTECH WEBACCESS

Original release date: October 12, 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/.

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1. EXECUTIVE SUMMARY

 * CVSS v3 9.8
 * ATTENTION: Exploitable remotely/low attack complexity
 * Vendor: Advantech
 * Equipment: WebAccess
 * Vulnerabilities: Heap-based Buffer Overflow, Stack-based Buffer Overflow


2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to gain
remote code execution.


3. TECHNICAL DETAILS


3.1 AFFECTED PRODUCTS

The following versions of WebAccess, an HMI platform, are affected:

 * WebAccess Versions 9.02 and prior


3.2 VULNERABILITY OVERVIEW

3.2.1    HEAP-BASED BUFFER OVERFLOW CWE-122

The affected product is vulnerable to a heap-based buffer overflow, which may
allow an attacker to remotely execute code.

CVE-2021-33023 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.2    STACK-BASED BUFFER OVERFLOW CWE-121

The affected product is vulnerable to a stack-based buffer overflow, which may
allow an attacker to remotely execute code.

CVE-2021-38389 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).


3.3 BACKGROUND

 * CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and
   Wastewater Systems
 * COUNTRIES/AREAS DEPLOYED: East Asia, Europe, United States
 * COMPANY HEADQUARTERS LOCATION: Taiwan


3.4 RESEARCHER

Natnael Samson, @NattiSamson, working with Trend Micro’s Zero Day Initiative,
reported these vulnerabilities to CISA.


4. MITIGATIONS

Advantech has released Version 9.1.1(link is external) to address the
stack-based buffer overflow vulnerability.

In order to address the heap-based buffer overflow vulnerability, Advantech
recommends users directly add the remote access code to avoid being attacked by
unknown requests. This is the remote access code established during installation
of the Advantech WebAccess SCADA software (SCADA node, project node, or OPC
Service) on the OPC Server computer. The access code you enter here must match
the remote access code established during installation on the OPC Server. This
prevents unauthorized users from accessing the OPC Server data using the
Advantech WebAccess SCADA OPC Service.

If you have forgotten the remote access code using during software installation
on the OPC Server node, you have two options:

 1. Re-install the Advantech WebAccess SCADA software on the OPC Server node to
    change it and edit it to match in your database(link is external).
 2. Edit the BWSERVER.INI(link is external) file on the OPC Server node and edit
    it to match in your database using UPDATE.

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.



CONTACT INFORMATION

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov(link sends email)
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information: 
https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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