Buffer overflow on HUB descriptor in Azure RTOS USBX

CVE-2022-29223

What is CVE-2022-29223?

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack. In versions prior to 6.1.10, an attacker can cause a buffer overflow by providing the Azure RTOS USBX host stack a HUB descriptor with bNbPorts set to a value greater than UX_MAX_TT which defaults to 8. For a bNbPorts value of 255, the implementation of ux_host_class_hub_descriptor_get function will modify the contents of hub -> ux_host_class_hub_device -> ux_device_hub_tt array violating the end boundary by 255 - UX_MAX_TT items. The USB host stack needs to validate the number of ports reported by the hub, and if the value is larger than UX_MAX_TT, USB stack needs to reject the request. This fix has been included in USBX release 6.1.10.

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