SMA Solar Technology AG Sunny WebBox
Act Now9.6ICS-CERT ICSA-19-281-01Oct 8, 2019
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionRequired
Summary
The SMA Sunny WebBox contains a cross-site request forgery (CSRF) vulnerability that allows attackers to perform unauthorized actions without valid credentials. Successful exploitation could allow an attacker to modify passwords, enable unauthorized services, establish man-in-the-middle attacks, and alter sensor input parameters and device settings. This product is end-of-life and will not receive security updates.
What this means
What could happen
An attacker with network access could modify system passwords, enable unauthorized services, intercept communications, or alter sensor readings and device parameters on your solar inverter monitoring system, potentially disrupting PV generation monitoring and control.
Who's at risk
Solar energy facilities and PV system operators using SMA Sunny WebBox devices for solar inverter monitoring and control. This includes municipal utilities with solar generation, large commercial solar installations, and any facility monitoring PV systems through this device.
How it could be exploited
An attacker with network access to the Sunny WebBox device could exploit a cross-site request forgery (CSRF) vulnerability to trick an authenticated user into clicking a malicious link. Once exploited, the attacker gains the ability to modify administrator passwords, enable services, perform man-in-the-middle attacks, or change sensor input parameters without needing valid credentials themselves.
Prerequisites
- Network access to the Sunny WebBox device (typically port 80/443)
- User must click on an attacker-controlled link while logged into the web interface
- The web interface must be accessible from the attacker's network (e.g., exposed to the Internet or on the same network segment)
Remotely exploitableLow complexity attackNo authentication required for exploitationNo patch available—product is end-of-lifeAffects operational monitoring and control systemsDefault credentials often present
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
Firmware:≤ 1.6No fix yet
Remediation & Mitigation
0/6
Do now
0/3WORKAROUNDDisable port forwarding on your router/firewall; the Sunny WebBox does not require Internet-facing access for SMA Sunny Portal monitoring
HARDENINGReplace any default passwords with unique, strong passwords on the Sunny WebBox and associated accounts
HARDENINGClose unused ports on the Sunny WebBox and upstream network devices
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HARDENINGIf direct Internet access to the Sunny WebBox is absolutely necessary, implement an encrypted VPN for remote access instead of exposing the device directly
HOTFIXDecommission and replace the Sunny WebBox with a current, supported SMA monitoring product
Long-term hardening
0/1HARDENINGIsolate the Sunny WebBox on a dedicated network segment restricted from general IT networks and Internet-facing systems
CVEs (1)
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