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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-19-281-01) SMA Solar Technology AG Sunny WebBox
9 October 2019
AusCERT Security Bulletin Summary
Product: SMA Solar Technology AG Sunny WebBox
Operating System: Network Appliance
Impact/Access: Cross-site Request Forgery -- Remote with User Interaction
CVE Names: CVE-2019-13529
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ICS Advisory (ICSA-19-281-01)
SMA Solar Technology AG Sunny WebBox
Original release date: October 08, 2019
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1. EXECUTIVE SUMMARY
o CVSS v3 9.6
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: SMA Solar Technology AG
o Equipment: Sunny WebBox
o 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:
o Firmware Version 1.6 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
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 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/
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
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.
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
on the ICS webpage on us-cert.gov . 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 webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
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:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target this vulnerability.
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