7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.9 High
AI Score
Confidence
High
6.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.006 Low
EPSS
Percentile
78.6%
--------- Begin Update A Part 1 of 6 ---------
--------- End Update A Part 1 of 6 ---------
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.
--------- Begin Update A Part 2 of 6 ---------
Successful exploitation of these vulnerabilities could result in memory corruption, code execution, hijacking of userβs cookie/session tokens, and unintended browser action.
--------- End Update A Part 2 of 6 ---------
The following versions of Advantech WebAccess HMI Designer are affected:
--------- Begin Update A Part 3 of 6 ---------
--------- End Update A Part 3 of 6 ---------
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).
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).
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 ---------
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).
This vulnerability could allow an attacker to send malicious Javascript code resulting in hijacking of the userβs 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 ---------
--------- Begin Update A Part 5 of 6 ---------
kimiya, working with Trend Microβs 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 ---------
--------- Begin Update A Part 6 of 6 ---------
Advantech recommends users update to the latest version of WebAccess HMI Designer v2.1.11.0
Specific questions should be directed to Advantech customer service.
--------- End Update A Part 6 of 6 ---------
CISA recommends users take the following measures to protect themselves from 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-12-146-01BβTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-33000
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-33002
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-33004
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42703
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-42706
cwe.mitre.org/data/definitions/119.html
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/416.html
cwe.mitre.org/data/definitions/787.html
cwe.mitre.org/data/definitions/79.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Advantech%20WebAccess%20HMI%20Designer%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-21-173-01
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/publications/emailscams_0905.pdf
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.advantech.com/contact
www.advantech.com/support/details/installation?id=1-F6UG0T
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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mailto:?subject=Advantech%20WebAccess%20HMI%20Designer%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-21-173-01
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.9 High
AI Score
Confidence
High
6.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.006 Low
EPSS
Percentile
78.6%