06 February 2019
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0343 Multiple vulnerabilities have been identified in Kunbus PR100088 Modbus Gateway 6 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Kunbus PR100088 Modbus Gateway Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-6533 CVE-2019-6529 CVE-2019-6527 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-036-05 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-19-036-05) Kunbus PR100088 Modbus Gateway Original release date: February 05, 2019 Legal Notice All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/. 1. EXECUTIVE SUMMARY CVSS v3 10.0 ATTENTION: Exploitable remotely/low skill level to exploit Vendor: Kunbus Equipment: PR100088 Modbus gateway Vulnerabilities: Improper Authentication, Missing Authentication for Critical Function, Improper Input Validation 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to achieve remote code execution and/or cause a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of PR100088 Modbus gateway are affected: PR100088 Modbus gateway: All versions prior to Release R02 (or Software Version 1.1.13166) 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER AUTHENTICATION CWE-287 An attacker may be able change the password for an admin user who is currently or previously logged in, provided the device has not been restarted. CVE-2019-6527 has been assigned to this vulnerability. A CVSS v3 base score of 9.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H). 3.2.2 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306 Registers used to store Modbus values can be read and written from the web interface without authentication. CVE-2019-6533 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H) 3.2.3 IMPROPER INPUT VALIDATION CWE-20 An attacker could specially craft an FTP request that could crash the device. CVE-2019-6529 has been assigned to this vulnerability. A CVSS v3 base score of 4.9 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Communication COUNTRIES/AREAS DEPLOYED: Worldwide COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Nicolas Merle of Applied Risk reported these vulnerabilities to NCCIC. NCCIC coordinated these vulnerabilities with BSI Germany. 4. MITIGATIONS Kunbus recommends the following: Update to Version R02; the updated file can be downloaded from the link below (installation instructions can be found in the readme file included in the download): https://www.kunbus.com/productsecurity/security-topic-1.html?file=files/media/bugfixes/SU_100088_R02.zip These devices are not intended to be used in a public network. Rather, these devices are intended for use in an industrial environment with a protected network architecture. NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Locate control system networks and remote devices behind firewalls, and isolate them from the business network. 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents. No known public exploits specifically target these vulnerabilities. Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? The NCCIC 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. 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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: email@example.com 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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