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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2301 Multiple vulnerabilities have been identified in Crestron TSW-X60 and MC3 10 August 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Crestron TSW-X60 and MC3 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Privileged Data -- Existing Account Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-13341 CVE-2018-11229 CVE-2018-11228 CVE-2018-10630 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-221-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-221-01) Crestron TSW-X60 and MC3 Original release date: August 09, 2018 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 9.8 ATTENTION: Exploitable remotely/low skill level to exploit Vendor: Crestron Equipment: TSW-X60 and MC3 Vulnerabilities: OS Command Injections, Improper Access Control, Insufficiently Protected Credentials 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow remote code execution with escalated system privileges. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following products and versions are affected: TSW-X60, all versions prior to 2.001.0037.001; and MC3, all versions prior to 1.502.0047.001 3.2 VULNERABILITY OVERVIEW 3.2.1 OS COMMAND INJECTION CWE-78 This vulnerability may allow unauthenticated remote code execution via a Bash shell service in Crestron Toolbox Protocol (CTP). This vulnerability only affects TSW-X60 devices. CVE-2018-11228 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). 3.2.2 OS COMMAND INJECTION CWE-78 The vulnerability may allow unauthenticated remote code execution via command injection in Crestron Toolbox Protocol (CTP). This vulnerability only affects TSW-X60 devices. CVE-2018-11229 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). 3.2.3 IMPROPER ACCESS CONTROL CWE-284 The devices are shipped with authentication disabled, and there is no indication to users that they need to take steps to enable it. When compromised, the access to the CTP console is left open. CVE-2018-10630 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). 3.2.4 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522 The passwords for special sudo accounts may be calculated using information accessible to those with regular user privileges. Attackers could decipher these passwords, which may allow them to execute hidden API calls and escape the CTP console sandbox environment with elevated privileges. CVE-2018-13341 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Government Facilities, Commercial Facilities COUNTRIES/AREAS DEPLOYED: Worldwide COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER Jackson Thuraisamy, working with Security Compass, reported some of these vulnerabilities to Crestron. In addition, Ricky HeadlessZeke Lawshae, working with Trend Micros Zero Day Initiative, reported these vulnerabilities to NCCIC. 4. MITIGATIONS Crestron recommends users upgrade their devices to the newest firmware located at: TSW-X60 (login required) https://www.crestron.com/en-US/Software-Firmware/Firmware/Touchpanels/TSW-560-TSW-760-TSW-1060/2-001-0040-01 MC3 (login required) https://www.crestron.com/en-US/Software-Firmware/Firmware/3-Series-Processors/MC3/1-502-0047-001 Crestron also recommends users refer to Crestrons Online Help for more information about these and other vulnerabilities (Article #5471). Information for hardening devices is available in Article #5571. 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. 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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