CVE-2022-39344 : Exploit Details and Defense Strategies

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack, integrated with Azure RTOS ThreadX. Versions prior to 6.1.12 are vulnerable to buffer overflow when utilizing the USB DFU UPLOAD functionality, potentially leading to memory overwrite. This could allow attackers to bypass security measures or execute arbitrary code. The issue has been patched, and users are advised to upgrade to version 6.1.12. A workaround includes adding the

UPLOAD_LENGTH

check in all possible states.

Understanding CVE-2022-39344

This section provides an insight into the vulnerability and its impact.

What is CVE-2022-39344?

CVE-2022-39344 highlights a buffer overflow vulnerability in Azure RTOS USBX versions prior to 6.1.12, impacting the USB DFU UPLOAD functionality.

The Impact of CVE-2022-39344

The vulnerability could result in memory overwrite, enabling attackers to bypass security controls or execute arbitrary code, emphasizing the need for prompt mitigation.

Technical Details of CVE-2022-39344

Delve deeper into the technical aspects of the vulnerability for a comprehensive understanding.

Vulnerability Description

The issue arises from a buffer overflow in the

ux_device_class_dfu_control_request

function during the handling of DFU UPLOAD command when the system is in

UX_SYSTEM_DFU_STATE_DFU_IDLE

state.

Affected Systems and Versions

Azure RTOS USBX versions prior to 6.1.12 are impacted by this vulnerability, necessitating immediate action to safeguard systems.

Exploitation Mechanism

By exploiting the buffer overflow in the USB DFU UPLOAD functionality, threat actors could overwrite memory content, posing severe risks to system integrity.

Mitigation and Prevention

Explore the strategies to mitigate and prevent the CVE-2022-39344 vulnerability effectively.

Immediate Steps to Take

Users are strongly advised to upgrade Azure RTOS USBX to version 6.1.12 to eliminate the buffer overflow threat. Additionally, implementing the

UPLOAD_LENGTH

check in all potential states can serve as a temporary workaround.

Long-Term Security Practices

Maintain rigorous security practices, including regular system updates, vulnerability assessments, and security awareness training, to enhance overall defense against cyber threats.

Patching and Updates

Continuous monitoring of security advisories and promptly applying patches and updates is crucial to address emerging vulnerabilities and bolster system resilience.