A vulnerability was found in Azure RTOS USBX. It has been rated as critical. This issue affects the function _ux_host_class_cdc_ecm_mac_address_get. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Azure RTOS USBx is a USB host, device, and on-the-go (OTG) embedded stack, fully integrated with Azure RTOS ThreadX and available for all Azure RTOS ThreadX–supported processors. Azure RTOS USBX implementation of host support for USB CDC ECM includes an integer underflow and a buffer overflow in the `_ux_host_class_cdc_ecm_mac_address_get` function which may be potentially exploited to achieve remote code execution or denial of service. Setting mac address string descriptor length to a `0` or `1` allows an attacker to introduce an integer underflow followed (string_length) by a buffer overflow of the `cdc_ecm -> ux_host_class_cdc_ecm_node_id` array. This may allow one to redirect the code execution flow or introduce a denial of service. The fix has been included in USBX release [6.1.12](https://github.com/azure-rtos/usbx/releases/tag/v6.1.12_rel). Improved mac address string descriptor length validation to check for unexpectedly small values may be used as a workaround.

The weakness was released 10/11/2022 as GHSA-chpp-5fv9-6368. The advisory is shared at github.com. The identification of this vulnerability is CVE-2022-36063 since 07/15/2022. Technical details are known, but no exploit is available.

Upgrading to version 6.1.12 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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• Azure

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• RTOS USBX

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