SMA Solar Technology AG Sunny WebBox

# ICS Advisory (ICSA-19-281-01) ## SMA Solar Technology AG Sunny WebBox Original release date: October 08, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-281-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-281-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-19-281-01) ### 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 9.6** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** SMA Solar Technology AG * **Equipment:** Sunny WebBox * **Vulnerability:** Cross-Site Request Forgery ## 2\. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to generate a denial-of-service condition, modify passwords, enable services, achieve man-in-the-middle, and modify input parameters associated with devices such as sensors. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following version of Sunny WebBox is affected: * Firmware Version 1.6 and prior ### 3.2 VULNERABILITY OVERVIEW #### 3.2.1 [CROSS-SITE REQUEST FORGERY (CSRF) CWE-352](https://cwe.mitre.org/data/definitions/352.html) An attacker could send a malicious link to an authenticated operator, which may allow remote attackers to perform actions with the permissions of the user. This device uses IP addresses to maintain communication after a successful login, which would increase the ease of exploitation. [CVE-2019-13529](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13529) has been assigned to this vulnerability. A CVSS v3 base score of 9.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Energy * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Germany ### 3.4 RESEARCHER Borja Merino and Eduardo Villaverde of the Technical Inspection Laboratory of the Mining School (University of Leon), through Adenda 2, coordinated this vulnerability with Carlos del Canto and Victor Fidalgo of INCIBE-CERT's Industrial Cybersecurity Team. ## 4\. MITIGATIONS This product is end-of-life and is no longer supported. SMA recommends deactivation of port forwarding as it is not required for monitoring PV systems via the SMA Sunny Portal. If direct access to a system from the Internet is necessary, SMA recommends using an encrypted virtual private network (VPN). On delivery, any saved default passwords should also be replaced with individual secure passwords, and unused ports on the system/router should be closed. SMA installers and administrators can answer specific questions about individual configuration of SMA devices. Basic information on this topic can also be found at: <https://files.sma.de/dl/7680/CyberSecurity-TI-en-10.pdf> 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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: * Do not click web links or open unsolicited attachments in email messages. * Refer to [Recognizing and Avoiding Email Scams](https://www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf) for more information on avoiding email scams. * Refer to [Avoiding Social Engineering and Phishing Attacks](https://www.us-cert.gov/ncas/tips/ST04-014) for more information on social engineering attacks. No known public exploits specifically target this vulnerability.