CVE-2017-9855
CriticalSummary
An issue was discovered in SMA Solar Technology products related to the Grid Guard system, which uses predictable codes. Such a code, when combined with the installer account, allows changing very sensitive parameters.
Risk Assessment
The organization may be exposed to unauthorized changes in inverter configurations, potentially leading to serious security and performance issues.
Recommendation
It is recommended to review and update authorization procedures and monitor the use of Grid Guard codes to minimize the risk of unauthorized access.
Original NVD description (English source)
An issue was discovered in SMA Solar Technology products. A secondary authentication system is available for Installers called the Grid Guard system. This system uses predictable codes, and a single Grid Guard code can be used on any SMA inverter. Any such code, when combined with the installer account, allows changing very sensitive parameters. NOTE: the vendor reports that Grid Guard is not an authentication feature; it is only a tracing feature. Also, only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected