ESB-2018.1772 - [Appliance] Siemens SCALANCE X Switches, RUGGEDCOM WiMAX, RFID 181-EIP, and SIMATIC RF182C: Execute arbitrary code/commands - Remote/unauthenticated 2018-06-15
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1772 Advisory (ICSA-18-165-01) Siemens SCALANCE X Switches, RUGGEDCOM WiMAX, RFID 181-EIP, and SIMATIC RF182C 15 June 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SCALANCE X Switches Siemens RUGGEDCOM WiMAX Siemens RFID 181-EIP Siemens SIMATIC RF182C Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-4833 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-165-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-165-01) Siemens SCALANCE X Switches, RUGGEDCOM WiMAX, RFID 181-EIP, and SIMATIC RF182C Original release date: June 14, 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 o CVSS v3 7.5 o ATTENTION: Exploitable from the same local network segment (OSI Layer 2) o Vendor: Siemens o Equipment: SCALANCE X switches, RUGGEDCOM WiMAX, RFID 181-EIP, and SIMATIC RF182C o Vulnerability: Permissions, Privileges, and Access Controls 2. RISK EVALUATION By sending a specially-crafted DHCP response to a client's DHCP request, an unprivileged remote attacker could execute arbitrary code. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Siemens reports the vulnerability affects the following products: o RFID 181-EIP: All versions, o RUGGEDCOM WiMAX: v4.4 and v4.5, o SCALANCE X-200: All versions prior to v5.2.3, o SCALANCE X-200 IRT: All versions prior to v5.4.1, o SCALANCE X-204RNA: All versions, o SCALANCE X-300: All versions, o SCALANCE X408: All versions, o SCALANCE X414: All versions, and o SIMATIC RF182C: All versions. 3.2 VULNERABILITY OVERVIEW 3.2.1 PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS CWE-264 Unprivileged remote attackers located in the same local network segment (OSI Layer 2) could gain remote code execution on the affected products by sending a specially-crafted DHCP response to a client's DHCP request. CVE-2018-4833 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture, Healthcare and Public Health, Transportation Systems, and Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Dr. Ang Cui and Joseph Pantoga from Red Balloon Security reported this vulnerability to Siemens Product CERT. 4. MITIGATIONS Siemens has provided updates for the following products to fix the vulnerability: o SCALANCE X-200: Update to v5.2.3 https://support.industry.siemens.com/cs/cn/en/view/109758142 o SCALANCE X-200 IRT: Update to v5.4.1 https://support.industry.siemens.com/cs/de/en/view/109758144 Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk: o Use static IP addresses instead of DHCP o Apply cell protection concept: https://www.siemens.com/cert/ operational-guidelines-industrial-security o Apply Defense-in-Depth: https://www.siemens.com/cert/ operational-guidelines-industrial-security As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and following the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information on this vulnerability and associated software updates, please see Siemens security advisory SSA-181018 on their website: https://www.siemens.com/cert/advisories NCCIC 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. 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 this vulnerability. High skill level is needed to exploit. 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWyMUyGaOgq3Tt24GAQgRFBAAh25ZJxwNuGfBY/1pnbyVbOGIDqnpwlkK DM4rZ7u4OjTzMBE0YmJsAyOeYjDdmkL6mHmCxruieZIITi5s7MbGUfm7myBXKUjO dP6OWoxMV21IPTRAdJe4lKgytSZVnrFcEoTijZlAxW+IneN30fECHiNcRv0Foetg vSBqabyFYCYIWZS9OTv/nlbX6DnO4pqsD+aA8cnsG+8wd9cJFiW6+dSDzWxmRAz2 p1eyrmxRpUoR7PPanYl3HJNfF8Sg9mdMmGXApTL8c2W5sB5NPByHkUQXneGkINrn r36x0he6ni3gqnRf9lUb2VGwyMeqIYbKMaY+pI3SUNwEOL4vO4iKAeEOWM3excuy UIFfcJA0P8HKJOzk0c2lrhiV30NqQJSgAGvZhgshraq85CxCfOxmLwruUIl+0E9l f2BeSMpt0Mn6oUySnG5sA5X0N81dGBmduhZuf24g+H0qYHj/OZhHgaSwRns/iRC8 C/gV1hptTkRVtkaUx1A8Qw3o0LFmzZKjmJiq+Q2xbNHWyR4vdsl6IbFaGSc0sLVS J3bcBrB89Cw+p8/CM01a+vpNJLhqreU159RM9K76uLmj4I8hcvW0QczbyxndPBto TSUqHEU/dfKtWWbfeb1HZRjwQzgY4ugFPgm897mrSYUCHqvRyZG5TPTHcrnneNEH NmTwc7nPvRw= =Bk5p -----END PGP SIGNATURE-----« Back to bulletins