# ICS Advisory (ICSA-20-261-01) ## Advantech WebAccess Node Original release date: September 17, 2020 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-261-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-261-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-261-01) ### Legal Notice All information products included in [https://us-cert.gov/ics](/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://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 7.8** * **ATTENTION:** Low skill level to exploit * **Vendor:** Advantech * **Equipment:** WebAccess Node * **Vulnerability:** Incorrect Permission Assignment for Critical Resource ## 2\. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to escalate their privileges. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following versions of WebAccess Node, an HMI platform, are affected: * WebAccess Node: All versions prior to 9.0.1 ### 3.2 VULNERABILITY OVERVIEW #### 3.2.1 [INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732](https://cwe.mitre.org/data/definitions/732.html) The affected product has incorrect permissions set for resources used by specific services, which may allow code execution with system privileges. [CVE-2020-16202](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-16202) 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:L/UI:N/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/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 Mat Powell of Trend Micro's Zero Day Initiative reported this vulnerability to CISA. ## 4\. MITIGATIONS Advantech has released [update 9.0.1](https://support.advantech.com/support/DownloadSRDetail_New.aspx?SR_ID=1-MS9MJV&Doc_Source=Download) to mitigate this vulnerability. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Follow the principle of least privilege. 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](https://www.us- cert.gov/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS- TIP-12-146-01B). 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 this vulnerability. This vulnerability is not exploitable remotely.