CVE-2022-39293 : Security Advisory and Response

CVE-2022-39293 involves a vulnerability in Azure RTOS USBX Host PIMA that can lead to a read integer underflow with buffer overflow.

Understanding CVE-2022-39293

Azure RTOS USBX is a high-performance USB host, device, and OTG embedded stack integrated with Azure RTOS ThreadX. The vulnerability lies in the

ux_host_class_pima_read.c

file.

What is CVE-2022-39293?

The vulnerability arises due to an integer underflow while calculating data length from the device response, leading to a buffer overflow in specific conditions.

The Impact of CVE-2022-39293

Exploitation of this vulnerability can result in unexpected data pointer movement to cause a buffer overflow, potentially allowing attackers to execute arbitrary code or crash the system.

Technical Details of CVE-2022-39293

The vulnerability description, affected systems, and exploitation mechanism are detailed below.

Vulnerability Description

A calculation error in the

ux_host_class_pima_read

function can lead to an integer underflow on the data length calculation, resulting in a buffer overflow.

Affected Systems and Versions

Vendor: azure-rtos
Product: usbx
Versions Affected: < 6.1.12

Exploitation Mechanism

By manipulating the data length header in specific ways, an attacker can exploit this vulnerability to trigger a buffer overflow.

Mitigation and Prevention

Protect your system from CVE-2022-39293 with immediate steps and long-term security practices.

Immediate Steps to Take

Upgrade to USBX release 6.1.12 to apply the fix.
Implement a workaround by ensuring

header_length

is validated appropriately.

Long-Term Security Practices

Regularly update software components to stay protected against known vulnerabilities.

Patching and Updates

Refer to the USBX release 6.1.12 for the patched version.