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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4481.2 Advisory (icsa-20-352-02,icsa-20-352-03) PTC Kepware Product Vulnerabilities 6 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: PTC Kepware Products Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Administrator Compromise -- Remote/Unauthenticated Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-27267 CVE-2020-27265 CVE-2020-27263 CVE-2020-13535 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-20-352-02 https://us-cert.cisa.gov/ics/advisories/icsa-20-352-03 Comment: This bulletin contains two (2) ICS-CERT security advisories. Revision History: January 6 2021: ICSA-20-352-02 updated and includes additional vulnerable products December 18 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-352-02) PTC Kepware KEPServerEX (Update A) Original release date: January 05, 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 9.8 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: PTC o Equipment: Kepware KEPServerEX o Vulnerabilities: Stack-based Buffer Overflow, Heap-based Buffer Overflow, Use After Free 2. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-20-352-02 PTC Kepware KEPServerEX that was published December 17, 2020, on the ICS webpage on us-cert.cisa.gov. 3. RISK EVALUATION Successful exploitation of these vulnerabilities could lead to a server crashing, a denial-of-service condition, data leakage, or remote code execution. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS The following products are affected by the vulnerabilities found in Kepware KEPServerEX, a connectivity platform: o KEPServerEX: v6.0 to v6.9 o ThingWorx Kepware Server: v6.8 and v6.9 o ThingWorx Industrial Connectivity: All versions o OPC-Aggregator: All versions - --------- Begin Update A Part 1 of 2 --------- o The following products may have a vulnerable component: o Rockwell Automation KEPServer Enterprise: v6.6.504.0 and v6.9.572.0 o GE Digital Industrial Gateway Server: v7.68.804 and v7.66 o Software Toolbox TOP Server: All 6.x versions - --------- End Update A Part 1 of 2 --------- 4.2 VULNERABILITY OVERVIEW 4.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 The affected products are vulnerable to a stack-based buffer overflow. Opening a specifically crafted OPC UA message could allow an attacker to crash the server and remotely execute code. CVE-2020-27265 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:H/A:H ). 4.2.2 HEAP-BASED BUFFER OVERFLOW CWE-122 The affected products are vulnerable to a heap-based buffer overflow. Opening a specifically crafted OPC UA message could allow an attacker to crash the server and potentially leak data. CVE-2020-27263 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:N/A:H ). 4.2.3 USE AFTER FREE CWE-416 The affected products are vulnerable to a use after free vulnerability, which may allow an attacker to create and close OPC UA connections at a high rate that may cause a server to crash. CVE-2020-27267 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:N/I:N/A:H ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 4.4 RESEARCHER Uri Katz of Claroty reported these vulnerabilities to PTC. 5. MITIGATIONS PTC has released updates for the following products and recommends that users upgrade to the most current supported version: o KEPServerEX Version 6.6 should upgrade to Version 6.6.362.0 Version 6.7 should upgrade to Version 6.7.1067.0 Version 6.8 should upgrade to Version 6.8.838.0 Version 6.9 should upgrade to Version 6.9.584.0 o ThingWorx Kepware Server Version 6.8 should upgrade to Version 6.8.839.0 Version 6.9 should upgrade to Version 6.9.584.0 - --------- Begin Update A Part 2 of 2 --------- o ThingWorx Industrial Connectivity Version 8.4 should upgrade to Version 8.4 (6.6.362.0) Version 8.5 should upgrade to Version 8.5 (6.7.1068.0) o OPC-Aggregator Version 6.9 should upgrade to Version 6.9.584.0 PTC recommends users of the following products upgrade to the most current supported version: o Rockwell Automation KEPServer Enterprise Version 6.6 should upgrade to Version 6.6.550.0 Version 6.9 should upgrade to Version 6.9.584.0 Rockwell recommends users upgrade to the most current version available, depending on the base version of the affected product they are using. - --------- End Update A Part 2 of 2 --------- o GE Digital Industrial Gateway Server Versions 7.68.804 and 7.66 should update to Version 7.68.839.0 The GE Digital Security Advisory GED 20-05 can be accessed on the GE Digital Security Advisories Customer Center webpage. o Software Toolbox TOP Server Version 6.7 should upgrade to Version 6.7.1068.0 Version 6.8 should upgrade to Version 6.8.840.0 Version 6.9 should upgrade to Version 6.9.584.0 Software Toolbox has released updates and recommends users update their installations. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices. 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. 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. - ------------------------------------------------------------------------------- ICS Advisory (ICSA-20-352-03) PTC Kepware LinkMaster Original release date: December 17, 2020 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 9.3 o ATTENTION: Low skill level to exploit o Vendor: PTC o Equipment: Kepware LinkMaster o Vulnerability: Incorrect Default Permissions 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a local attacker to globally overwrite the service configuration to execute arbitrary code with NT SYSTEM privileges. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of PTC Kepware LinkMaster, a Windows application linking data between OPC servers, are affected: o Kepware LinkMaster Version 3.0.94.0 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 INCORRECT DEFAULT PERMISSIONS CWE-276 The affected product has incorrect default permissions, which may grant an attacker access to reconfigure the service in any manner. CVE-2020-13535 has been assigned to this vulnerability. A CVSS v3 base score of 9.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:C/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER Yuri Kramarz of Cisco Talos reported this vulnerability to PTC. 4. MITIGATIONS PTC recommends users upgrade to Version 3.0.99 CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 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. 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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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