Siemens LOGO!8 BM Missing Authentication for Critical Function, Improper Handling of Extra Values, Plaintext Storage of a Password (CVE-2019-10921 CVE-2019-10920 CVE-2019-10919 )

# ICS Advisory (ICSA-19-134-04) ## Siemens LOGO!8 BM Original release date: May 14, 2019 | Last revised: May 15, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-134-04) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-134-04) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-134-04) ### 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 9.4** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** Siemens * **Equipment:** LOGO!8 BM * **Vulnerabilities:** Missing Authentication for Critical Function, Improper Handling of Extra Values, Plaintext Storage of a Password ## 2\. RISK EVALUATION Successful exploitation of these vulnerabilities could allow device reconfiguration, access to project files, decryption of files, and access to passwords. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following versions of Siemens LOGO!8 BM, a programmable logic controller, are affected: * Siemens LOGO!8 BM: all versions ### 3.2 VULNERABILITY OVERVIEW **3.2.1 [MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306](https://cwe.mitre.org/data/definitions/306.html)** Attackers with access to Port 10005/TCP could perform device reconfigurations and obtain project files from the devices. [CVE-2019-10919](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10919) has been assigned to this vulnerability. A CVSS v3 base score of 9.4 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L)). **3.2.2 [IMPROPER HANDLING OF EXTRA VALUES CWE-231](https://cwe.mitre.org/data/definitions/231.html)** Project data stored on the device, which is accessible via Port 10005/TCP, can be decrypted due to a hardcoded encryption key. [CVE-2019-10920](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10920) 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:H/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)). **3.2.3 [PLAINTEXT STORAGE OF A PASSWORD CWE-256](https://cwe.mitre.org/data/definitions/256.html)** Unencrypted storage of passwords in the project could allow an attacker with access to Port 10005/TCP to obtain passwords of the device. [CVE-2019-10921](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10921) 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:H/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Commercial Facilities, Transportation Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 3.4 RESEARCHER Manuel Stotz and Matthias Deeg from SySS GmbH reported these vulnerabilities to Siemens. ## 4\. MITIGATIONS The LOGO!8 BM manual recommends protecting access to Port 10005/TCP. 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](https://assets.new.siemens.com/siemens/assets/public.1502968141.411e91564a2d259ecd4b6c79b51f89c044b3de81.operational- guidelines-industrial-security-en.pdf) and following the recommendations in the product manuals. Additional information on industrial security for Siemens devices can be found at: <https://www.siemens.com/industrialsecurity> For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security Advisory SSA-542701 at the following location: <http://www.siemens.com/cert/advisories> NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](/ics/alerts/ICS- ALERT-10-301-01). * 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](/ics/content/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](/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-CERT website](/ics/) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](/ics/tips/ICS-TIP-12-146-01B). 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.