An exploitable vulnerability exists in the signature verification of the firmware update functionality of Circle with Disney. Specially crafted network packets can cause an unsigned firmware to be installed in the device resulting in arbitrary code execution. An attacker can send a series of packets to trigger this vulnerability.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
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https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0405 | third party advisory exploit technical description |