Siemens RUGGEDCOM ROS

# ICS Advisory (ICSA-19-344-03) ## Siemens RUGGEDCOM ROS Original release date: December 10, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-344-03) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-344-03) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-344-03) ### Legal Notice All information products included in [https://us-cert.gov/ics](/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://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 7.8** * **ATTENTION:** Low skill level to exploit * **Vendor:** Siemens * **Equipment:** RUGGEDCOM ROS * **Vulnerabilities:** Improper Restriction of Operations within the Bounds of a Memory Buffer, Resource Management Errors ## 2\. RISK EVALUATION Successful exploitation of these vulnerabilities could allow a denial-of- service condition or arbitrary code execution. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following versions of RUGGEDCOM ROS, an ethernet switch, are affected: * RMC8388: all versions * RSG2488: all versions * RSG920P: all versions * RSG9xx R/C: all versions * RSL910: all versions * RST2228: all versions Some of these devices are only affected by one of these vulnerabilities, please see SSA-618620 for details. ### 3.2 VULNERABILITY OVERVIEW #### 3.2.1 [IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119](https://cwe.mitre.org/data/definitions/119.html) The embedded boot loader has a locally exploitable buffer overflow via a crafted kernel image because the filesystem loading is mishandled. [CVE-2018-18440](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-18440) has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is ([AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)). #### 3.2.2 [RESOURCE MANAGEMENT ERRORS CWE-399](https://cwe.mitre.org/data/definitions/399.html) The embedded boot loader has a physically exploitable vulnerability. A crafted self-referential DOS partition table will cause the bootloader to infinitely recurse, causing the stack to grow infinitely and eventually crash. [CVE-2019-13103](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13103) has been assigned to this vulnerability. A CVSS v3 base score of 4.6 has been calculated; the CVSS vector string is ([AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Energy, Healthcare and Public Health, Transportation Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 3.4 RESEARCHER Siemens reported these vulnerabilities to CISA. ## 4\. MITIGATIONS Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk: * CVE-2018-18440: Disable boot interface access during boot up via the 'bootoption.txt' file parameter 'Security = yes'. * CVE-2019-13103: Disable access to the removable media via 'bootoption.txt' file parameter 'Disableautoaccessremovable = yes'. Note that this vulnerability only applies to RUGGEDCOM ROS, if the device boots from removable media. 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 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 more detailed mitigation instructions, please see Siemens security advisory SSA-618620 at the following location: <http://www.siemens.com/cert/advisories> CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: * Restrict access to devices following a least privilege principle. * Implement physical security controls to mitigate unauthorized physical access. 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](https://www.us- cert.gov/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS- TIP-12-146-01B). 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. These vulnerabilities are not exploitable remotely.