// For flags

CVE-2022-36063

USBX Host CDC ECM integer underflow with buffer overflow

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

2
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Azure RTOS USBx es una pila embebida de host, dispositivo y on-the-go (OTG) USB, totalmente integrada con Azure RTOS ThreadX y disponible para todos los procesadores compatibles con Azure RTOS ThreadX. La implementación de Azure RTOS USBX del soporte de host para USB CDC ECM incluye un desbordamiento de entero y un desbordamiento de búfer en la función "_ux_host_class_cdc_ecm_mac_address_get" que puede ser potencialmente explotada para lograr la ejecución remota de código o la denegación de servicio. Establecer la longitud del descriptor de la cadena de direcciones mac a un "0" o "1" permite a un atacante introducir un desbordamiento de enteros seguido (string_length) por un desbordamiento del buffer del array "cdc_ecm -) ux_host_class_cdc_ecm_node_id". Esto puede permitir redirigir el flujo de ejecución del código o introducir una denegación de servicio. La corrección ha sido incluida en USBX versión [6.1.12](https://github.com/azure-rtos/usbx/releases/tag/v6.1.12_rel). Ha sido mejorada la comprobación de la longitud del descriptor de la cadena de direcciones mac para comprobar los valores inesperadamente pequeños, lo que puede usarse como mitigación

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-07-15 CVE Reserved
  • 2022-10-10 CVE Published
  • 2024-07-29 EPSS Updated
  • 2024-08-03 CVE Updated
  • 2024-08-03 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-121: Stack-based Buffer Overflow
  • CWE-191: Integer Underflow (Wrap or Wraparound)
  • CWE-1284: Improper Validation of Specified Quantity in Input
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Microsoft
Search vendor "Microsoft"
 Azure Rtos Usbx
Search vendor "Microsoft" for product "Azure Rtos Usbx"
 < 6.1.11
Search vendor "Microsoft" for product "Azure Rtos Usbx" and version " < 6.1.11"
-
Affected