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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3828 Advisory (icsa-21-313-05) OSIsoft PI Vision 10 November 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OSIsoft PI Vision Publisher: ICS-CERT Operating System: Windows Impact/Access: Modify Arbitrary Files -- Existing Account Cross-site Scripting -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-3095 CVE-2021-3090 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-313-05 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-313-05) OSIsoft PI Vision Original release date: November 09, 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 6.5 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: OSIsoft o Equipment: PI Vision o Vulnerabilities: Cross-site Scripting, Incorrect Authorization 2. RISK EVALUATION Successful exploitation of these vulnerabilities could lead to information disclosure, modification, or deletion. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of PI Vision, a data management platform, are affected: o PI:Vision: All versions prior to 2021 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE SCRIPTING') CWE-79 A remote attacker with write access to PI Vision could inject code into a display. Unauthorized information disclosure, modification, or deletion is possible if a victim views or interacts with the infected display using Microsoft Internet Explorer. The impact affects PI System data and other data accessible with victim's user permissions. CVE-2021-3090 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:H/PR:L/UI:R/S:C/ C:H/I:L/A:N ). 3.2.2 INCORRECT AUTHORIZATION CWE-863 PI Vision could disclose information to a user with insufficient privileges for an AF attribute that is the child of another attribute and is configured as a Limits property. CVE-2021-3095 has been assigned to this vulnerability. A CVSS v3 base score of 3.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/ C:L/I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER OSIsoft reported these vulnerabilities to CISA. 4. MITIGATIONS OSIsoft recommends upgrading to PI vision 2021. Information can be found in the OSIsoft PI Vision security bulletin (registration required). OSIsoft recommends users apply the following workarounds for PI Vision to help reduce risk: o Configure Publisher and Explorer roles in PI Vision User Access Levels to restrict which users can create or modify displays. o Remove any Limits properties from AF child attributes using PI System Explorer or a bulk editing tool. OSIsoft recommends the following defense measures to lower the impact of exploitation for PI Vision: o Use a modern web browser such as Microsoft Edge, Google Chrome, or Mozilla FireFox. Do not use Microsoft Internet Explorer. o If upgrade is not an option, administrators should regularly audit the AF hierarchy to ensure there are no unexpected or unknown elements, attributes, or attribute properties. It is recommended security on elements in AF be configured and enforced in addition to configuring PI point security. o Potential unauthorized viewing of PI System data due to this issue is limited to permissions granted to the PI Vision Application Pool Identity. Configure a dedicated identity mapping for PI Vision servers and manage permissions in accordance with a data classification policy. See OSIsoft customer portal knowledge article for additional details and associated security updates (registration required). 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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities. 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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