This updated advisory is a follow-up to the original advisory titled ICSA-21-168-03 Advantech WebAccess/SCADA that was published June 17, 2021, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of these vulnerabilities could allow an attacker to read files outside the intended directory or redirect a user to a malicious webpage.
The following versions of Advantech WebAccess/SCADA, a browser-based SCADA software package, are affected:
The affected product is vulnerable to redirection, which may allow an attacker to send a maliciously crafted URL that could result in redirecting a user to a malicious webpage.
CVE-2021-32956 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
The affected product is vulnerable to a directory traversal, which may allow an attacker to remotely read arbitrary files on the file system.
CVE-2021-32954 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).
Chizuru Toyama of TXOne IoT/ICS Security Research Labs, working with Trend Microβs Zero Day Initiative, reported these vulnerabilities to CISA.
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Advantech recommends users upgrade to any version after v9.0.1
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For more information, contact Advantech via website or phone (1-888-576-9668).
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32954
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32956
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