CVE-2022-29223 : Security Advisory and Response

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

. This vulnerability has been assigned CVE-2022-29223.

Understanding CVE-2022-29223

This CVE pertains to a buffer overflow vulnerability in Azure RTOS USBX versions prior to 6.1.10, allowing an attacker to trigger a buffer overflow by sending a specially crafted HUB descriptor.

What is CVE-2022-29223?

In Azure RTOS USBX versions before 6.1.10, an attacker can exploit a buffer overflow by providing a HUB descriptor with a specific value for

bNbPorts

, leading to modifications that exceed the designated boundary.

The Impact of CVE-2022-29223

With a CVSS base score of 7.5, this vulnerability has a high severity level. It can result in a denial of service or potentially arbitrary code execution on affected systems.

Technical Details of CVE-2022-29223

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

By manipulating the

bNbPorts

value in a HUB descriptor, an attacker can trigger a buffer overflow in the Azure RTOS USBX host stack, potentially leading to code execution.

Affected Systems and Versions

Azure RTOS USBX versions prior to 6.1.10 are susceptible to this buffer overflow vulnerability.

Exploitation Mechanism

The exploitation involves providing a HUB descriptor with a

bNbPorts

value exceeding the boundary, causing modifications that can lead to a buffer overflow.

Mitigation and Prevention

To address CVE-2022-29223 and safeguard systems, it is crucial to implement the following measures.

Immediate Steps to Take

Upgrade to the latest version of Azure RTOS USBX (6.1.10) that contains the necessary fix for this vulnerability.
Ensure proper input validation and boundary checks in USB host stacks to prevent buffer overflows.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Azure RTOS to stay informed about potential vulnerabilities.
Conduct regular security assessments and testing to identify and mitigate security weaknesses.

Patching and Updates

Apply patches and updates promptly to address known vulnerabilities and enhance the security posture of Azure RTOS USBX.