Siemens SIMATIC WinCC and SIMATIC PCS 7

# ICS Advisory (ICSA-19-134-02) ## Siemens SIMATIC WinCC and SIMATIC PCS 7 Original release date: May 14, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-134-02-0) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-134-02-0) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-134-02-0) ### 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 9.8** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** Siemens * **Equipment:** SIMATIC WinCC and SIMATIC PCS 7 * **Vulnerability:** Missing Authentication for Critical Function ## 2\. RISK EVALUATION Successful exploitation of this vulnerability could allow an unauthenticated attacker with access to the affected devices to execute arbitrary code. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS Siemens reports that the vulnerability affects the following SIMATIC products: * SIMATIC PCS 7 v8.0 and earlier * SIMATIC PCS 7 v8.1 and newer (if "Encrypted Communication" is disabled) * SIMATIC WinCC v7.2 and earlier * SIMATIC WinCC v7.3 and newer (if "Encrypted Communication" is disabled) ### 3.2 VULNERABILITY OVERVIEW **3.2.1 [MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306](https://cwe.mitre.org/data/definitions/306.html)** If affected installations do not have "Encrypted Communication" configured, an unauthenticated attacker with network access may be able to execute arbitrary code. [CVE-2019-10922](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10922) 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](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:H)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Chemical, Energy, Food and Agriculture, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 3.4 RESEARCHER Vladimir Dashchenko and Sergey Temnikov from Kaspersky Lab reported this vulnerability to Siemens. ## 4\. MITIGATIONS Siemens recommends the following mitigations: * Upgrade SIMATIC WinCC to v7.3 or newer. * Upgrade SIMATIC PCS 7 to v8.1 or newer. * Enable "Encrypted Communications" (some newer versions have this enabled by default). * Apply defense-in-depth concepts. 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 users configure their 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 follow 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 the vulnerability and more detailed mitigation instructions, please see Siemens security advisory SSA-705517 at the following location: <http://www.siemens.com/cert/advisories> 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](/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 this vulnerability.