CVE-2022-36063
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.65%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.65% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-121, CWE-191, CWE-1284
- Affected
- eclipse/threadx usbx
- Source
- security-advisories@github.com
References
- https://github.com/azure-rtos/usbx/blob/master/common/usbx_host_classes/src/ux_host_class_cdc_ecm_mac_address_get.c#L264Exploit, Third Party Advisory
- https://github.com/azure-rtos/usbx/releases/tag/v6.1.12_relPatch, Release Notes, Third Party Advisory
- https://github.com/azure-rtos/usbx/security/advisories/GHSA-chpp-5fv9-6368Exploit, Patch, Third Party Advisory
- https://github.com/azure-rtos/usbx/blob/master/common/usbx_host_classes/src/ux_host_class_cdc_ecm_mac_address_get.c#L264Exploit, Third Party Advisory
- https://github.com/azure-rtos/usbx/releases/tag/v6.1.12_relPatch, Release Notes, Third Party Advisory
- https://github.com/azure-rtos/usbx/security/advisories/GHSA-chpp-5fv9-6368Exploit, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.