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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3041 Advisory (icsa-21-252-01) AVEVA PCS Portal 10 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: AVEVA PCS Portal Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-38410 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-252-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-252-01) AVEVA PCS Portal Original release date: September 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 7.3 o ATTENTION: Low attack complexity o Vendor: AVEVA o Equipment: Platform Common Services (PCS) Portal o Vulnerability: Uncontrolled Search Path Element 2. RISK EVALUATION The DLL hijacking vulnerability in the Platform Common Services (PCS) Portal, if exploited, could allow malicious code execution within the context of the PCS Portal application. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of the AVEVA Software Platform Common Services (PCS) Portal are affected: o PCS Versions 4.5.2, 4.5.1, 4.5.0, and 4.4.6 The following products ship a vulnerable version of the PCS Portal application and are affected: o AVEVA System Platform 2020 R2 P01, 2020 R2, and 2020 o AVEVA Work Tasks 2020 Update 1 o AVEVA Work Tasks 2020 o AVEVA Mobile Operator 2020 o AVEVA Manufacturing Execution System 2020 o AVEVA Batch Management 2020 o AVEVA Enterprise Data Management 2021 3.2 VULNERABILITY OVERVIEW 3.2.1 UNCONTROLLED SEARCH PATH ELEMENT CWE-427 The affected products are vulnerable to DLL hijacking through an uncontrolled search path element, which may allow an attacker control to one or more locations in the search path. CVE-2021-38410 has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United Kingdom 3.4 RESEARCHER Noam Moshe of Claroty discovered and disclosed the vulnerability to the AVEVA Software Security Response Center. 4. MITIGATIONS AVEVA recommends organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. Users of affected versions of the products should apply the corresponding security update as soon as possible. Security update PCS 4.5.3 is available for the following versions: o AVEVA Mobile Operator 2020 o AVEVA Enterprise Data Management 2021 o AVEVA System Platform 2020 R2 P01 o AVEVA System Platform 2020 R2 o AVEVA Work Tasks 2020 Update 1 Security update PCS 4.4.7 is available for the following versions: o AVEVA System Platform 2020 o AVEVA Work Tasks 2020 o AVEVA Manufacturing Execution System 2020 o AVEVA Batch Management 2020 For more information on this issue, including security updates, please see Security Bulletin AVEVA-2021-008 CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Reduce the attack surface by hard-coding the search path to a set of known-safe values (such as system directories), or only allow them to be specified by the administrator in a configuration file. o Reduce the attack surface by invoking other programs using fully qualified pathnames. o Reduce the attack surface by removing or restricting all environment settings before invoking other programs. o Check the search path before use and removing any elements that are likely to be unsafe, such as the current working directory or a temporary files directory. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. 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. 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 this vulnerability. This vulnerability is not exploitable remotely. 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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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