CVE-2022-36063 USBX Host CDC ECM integer underflow with buffer overflow
An integer underflow in Azure RTOS USBX CDC ECM host allows remote code execution or denial of service via malicious MAC address descriptors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-36063?
CVE-2022-36063 is a high-severity vulnerability in azure-rtos usbx, published on 10 Oct 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2022-36063?
It affects 1 product.
Products include Eclipse Threadx Usbx.
How do I fix CVE-2022-36063?
No fix has been published for CVE-2022-36063 yet. Limit exposure of the affected software until one is available.
Is CVE-2022-36063 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-36063 exists.
Other vulnerabilities in azure-rtos usbx
- CVE-2022-29246 Potential buffer overflow in function DFU upload in Azure RTOS USBX
- CVE-2022-39293 Azure RTOS USBX Host PIMA vulnerable to read integer underflow with buffer overflow
- CVE-2022-29223 Buffer overflow on HUB descriptor in Azure RTOS USBX
- CVE-2023-48695 Azure RTOS USBX Remote Code Execution Vulnerability
- CVE-2023-48694 Azure RTOS USBX Remote Code Execution Vulnerability
Sources
Also known as GHSA-chpp-5fv9-6368.