CVE-2022-29246 Explained : Impact and Mitigation

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack that is affected by a potential buffer overflow vulnerability. This vulnerability, identified as CVE-2022-29246, allows an attacker to introduce a buffer overflow resulting in the overwrite of memory contents, potentially leading to the execution of arbitrary code.

Understanding CVE-2022-29246

This section provides insights into the nature and impact of the CVE-2022-29246 vulnerability.

What is CVE-2022-29246?

The CVE-2022-29246 vulnerability in Azure RTOS USBX stems from the lack of proper validation in the DFU UPLOAD functionality, potentially allowing an attacker to trigger a buffer overflow. The issue specifically arises due to the inadequate handling of memory boundaries during the processing of DFU UPLOAD commands.

The Impact of CVE-2022-29246

With a base score of 9.8 out of 10, this critical vulnerability poses a severe risk to affected systems. In particular, the potential for memory corruption and arbitrary code execution can result in a compromise of system integrity and confidentiality.

Technical Details of CVE-2022-29246

In this section, we delve into the technical aspects of CVE-2022-29246 to provide a deeper understanding of the vulnerability.

Vulnerability Description

The vulnerability arises from the

ux_device_class_dfu_control_request

function, which fails to prevent buffer overflows when processing DFU UPLOAD commands. This oversight may lead to memory corruption and unauthorized code execution.

Affected Systems and Versions

Azure RTOS USBX versions prior to 6.1.11 are impacted by this vulnerability. Users and administrators are advised to update to the patched version, 6.1.11, to mitigate the risk.

Exploitation Mechanism

By issuing a control transfer request with a length greater than the buffer size, an attacker can trigger a buffer overflow, potentially leading to the execution of arbitrary code and compromising the platform's security.

Mitigation and Prevention

To address the CVE-2022-29246 vulnerability, immediate steps and long-term security practices are crucial.

Immediate Steps to Take

Users are strongly encouraged to update their Azure RTOS USBX installations to version 6.1.11 or newer to eliminate the risk of exploitation associated with the buffer overflow vulnerability.

Long-Term Security Practices

Implementing secure coding practices, performing regular security audits, and staying informed about the latest security advisories are essential for maintaining a robust security posture.

Patching and Updates

Vendor-supplied patches, such as USBX release 6.1.11, contain the necessary fixes for CVE-2022-29246. Users should prioritize the timely application of patches to ensure the security of their software deployments.