MQTT implementation in Sungrow iSolarCloud allowed users to subscribe to all data of all connected inverters

SunGrow's back end users system iSolarCloud https://isolarcloud.com  uses an MQTT service to transport data from the user's connected devices to the user's web browser.  The MQTT server however did not have sufficient restrictions in place to limit the topics that a user could subscribe to.  While the data that is transmitted through the MQTT server is encrypted and the credentials for the MQTT server are obtained though an API call, the credentials could be used to subscribe to any topic and the encryption key can be used to decrypt all messages received. An attack with an account on iSolarCloud.com could extract MQTT credentials and the decryption key from the browser and then use an external program to subscribe to the topic '#' and thus recieve all messages from all connected devices.

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授权机制缺失

Sungrow iSolarCloud 安全漏洞

Sungrow iSolarCloud（阳光云）是中国阳光电源（Sungrow）公司的一款用于监控和管理光伏电站的软件。 Sungrow iSolarCloud存在安全漏洞，该漏洞源于MQTT服务限制不足，可能导致订阅任意主题并解密所有消息。

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