Buffer overflow on HUB descriptor in Azure RTOS USBX
CVE-2022-29223

7.5HIGH

Key Information:

Vendor

Azure-rtos

Status
Usbx
Vendor
CVE Published:
24 May 2022

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.

Affected Version(s)

usbx < 6.1.10

References

https://github.com/azure-rtos/usbx/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/azure-rtos/usbx/releases/tag/v6.1.10_rel
x_refsource_MISC

EPSS Score

5% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.