[Suggested description]
An issue was discovered on TK-Star Q90 Junior GPS horloge 3.1042.9.8656 devices.
It performs actions based on certain SMS commands. This
can be used to set up a voice communication channel from the watch to
any telephone number, initiated by sending a specific SMS and using the
default password, e.g., pw,<password>,call,<mobile_number> triggers an outbound call
from the watch.
The password is sometimes available because of CVE-2019-20471.

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[VulnerabilityType Other]
Remote audio connection without explicit approval

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[Vendor of Product]
TK-star

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[Affected Product Code Base]
TK-Star Q90 Junior GPS horloge - 3.1042.9.8656

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[Affected Component]
Smartwatch

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[Attack Type]
Remote

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[Impact Code execution]
true

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[Impact Information Disclosure]
true

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[Attack Vectors]
An attacker needs to send an SMS to the device's mobile number. Knowledge of the mobile number is required before this vulnerability can be exploited.

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[Has vendor confirmed or acknowledged the vulnerability?]
true

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[Discoverer]
Dennis van Warmerdam, Jasper Nota, Jim Blankendaal

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[Reference]
https://www.tk-star.com

Use CVE-2019-20470.