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AUSCERT External Security Bulletin Redistribution
ESB-2021.2214
Advisory (icsa-21-173-01) Advantech WebAccess HMI Designer
23 June 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: WebAccess HMI Designer
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Create Arbitrary Files -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-33004 CVE-2021-33002 CVE-2021-33000
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01
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ICS Advisory (ICSA-21-173-01)
Advantech WebAccess HMI Designer
Original release date: June 22, 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 7.8
o ATTENTION: Low attack complexity
o Vendor: Advantech
o Equipment: WebAccess HMI Designer
o Vulnerabilities: Heap-based Buffer Overflow, Out-of-bounds Write, Improper
Restriction of Operation Within the Bounds of a Memory Buffer
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in memory
corruption and code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Advantech WebAccess HMI Designer are affected:
o WebAccess HMI Designer Versions 2.1.9.95 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
Parsing a maliciously crafted project file may cause a heap-based buffer
overflow, which may allow an attacker to perform arbitrary code execution. User
interaction is required.
CVE-2021-33000 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.2 OUT-OF-BOUNDS WRITE CWE-787
Opening a maliciously crafted project file may cause an out-of-bounds write,
which may allow an attacker to execute arbitrary code. User interaction is
required.
CVE-2021-33002 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.3 IMPROPER RESTRICTION OF OPERATION WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
The affected product is vulnerable to memory corruption condition due to lack
of proper validation of user supplied files, which may allow an attacker to
execute arbitrary code. User interaction is required.
CVE-2021-33004 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/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
Kimiya working with Trend Micro's Zero Day Initiative reported these
vulnerabilities to CISA.
4. MITIGATIONS
Advantech is still working on mitigations for these issues. Users should
contact Advantech customer service for more information.
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 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.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. These
vulnerabilities are not exploitable remotely.
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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