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 1. Industrial Control Systems    >
 2. ICS-CERT Advisories    >
 3. Advantech WebAccess HMI Designer (Update A)

More ICS-CERT Advisories


ICS ADVISORY (ICSA-21-173-01)


ADVANTECH WEBACCESS HMI DESIGNER (UPDATE A)

Original release date: November 09, 2021 | Last revised: November 10, 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 7.8
 * ATTENTION: Low attack complexity
 * Vendor: Advantech
 * Equipment: WebAccess HMI Designer

--------- Begin Update A Part 1 of 6 ---------

 * Vulnerabilities: Heap-based Buffer Overflow, Out-of-bounds Write, Improper
   Restriction of Operation Within the Bounds of a Memory Buffer, Use After
   Free, Cross-site Scripting

--------- End Update A Part 1 of 6 ---------


2. UPDATE INFORMATION

This updated advisory is a follow-up to the original advisory titled
ICSA-21-173-01 Advantech WebAccess HMI Designer that was published June 22,
2021, to the ICS webpage on us-cert.cisa.gov.


3. RISK EVALUATION

--------- Begin Update A Part 2 of 6 ---------

Successful exploitation of these vulnerabilities could result in memory
corruption, code execution, hijacking of user’s cookie/session tokens, and
unintended browser action.

--------- End Update A Part 2 of 6 ---------


4. TECHNICAL DETAILS


4.1 AFFECTED PRODUCTS

The following versions of Advantech WebAccess HMI Designer are affected:

--------- Begin Update A Part 3 of 6 ---------

 * WebAccess HMI Designer Versions prior to 2.1.11.0

--------- End Update A Part 3 of 6 ---------


4.2 VULNERABILITY OVERVIEW

4.2.1    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).

4.2.2    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).

4.2.3    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).

--------- Begin Update A Part 4 of 6 ---------

4.2.4    USE AFTER FREE CWE-416

This vulnerability could allow an attacker to disclose information and execute
arbitrary code on affected installations of WebAccess/MHI Designer.

CVE-2021-42706 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).

4.2.5    IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION
('CROSS-SITE SCRIPTING') CWE-79

This vulnerability could allow an attacker to send malicious Javascript code
resulting in hijacking of the user’s cookie/session tokens, redirecting the user
to a malicious webpage, and performing unintended browser action.

CVE-2021-42703 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/C:L/I:L/A:N).

--------- End Update A Part 4 of 6 ---------


4.3 BACKGROUND

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


4.4 RESEARCHER

--------- Begin Update A Part 5 of 6 ---------

kimiya, working with Trend Micro’s Zero Day Initiative, Chizuru Toyama of TXOne
IoT/ICS Security Research Labs, and Michael Heinzl reported these
vulnerabilities to CISA.

--------- End Update A Part 5 of 6 ---------


5. MITIGATIONS

--------- Begin Update A Part 6 of 6 ---------

Advantech recommends users update to the latest version of WebAccess HMI
Designer v2.1.11.0(link is external)

Specific questions should be directed to Advantech customer service(link is
external).

--------- End Update A Part 6 of 6 ---------

CISA recommends users take the following measures to protect themselves from
social engineering attacks: 

 * Do not click web links or open unsolicited attachments in email messages. 
 * Refer to Recognizing and Avoiding Email Scams for more information on
   avoiding email scams. 
 * 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
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.



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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policy.

Please share your thoughts.

We recently updated our anonymous product survey; we'd welcome your feedback.


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