CVE-2021-42553 : Security Advisory and Response

This CVE involves a buffer overflow vulnerability in the STM32 USB Host Library by STMicroelectronics, impacting versions prior to 3.5.1.

Understanding CVE-2021-42553

This section delves into the details of the vulnerability and its implications.

What is CVE-2021-42553?

CVE-2021-42553 is a buffer overflow vulnerability found in the stm32_mw_usb_host of STMicroelectronics. It provides attackers the ability to run arbitrary code by exploiting descriptors with excess endpoints compared to USBH_MAX_NUM_ENDPOINTS.

The Impact of CVE-2021-42553

This vulnerability poses a high risk as it allows attackers to execute malicious code, potentially compromising the confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-42553

Exploring the technical aspects of the vulnerability.

Vulnerability Description

The buffer overflow vulnerability arises in the stm32_mw_usb_host module of STMicroelectronics' STM32Cube, specifically affecting versions below 3.5.1.

Affected Systems and Versions

Vendor: STMicroelectronics STM32Cube
Product: STM32 USB Host Library
Affected Versions: All versions prior to 3.5.1

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating descriptors with more endpoints than USBH_MAX_NUM_ENDPOINTS, enabling the execution of arbitrary code.

Mitigation and Prevention

Guidelines for mitigating and preventing the exploitation of this vulnerability.

Immediate Steps to Take

Update the STM32 USB Host Library to version 3.5.1 or higher to address the vulnerability.
Monitor for any signs of unauthorized code execution or system compromise.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement strict input validation mechanisms to thwart buffer overflow attacks.

Patching and Updates

Apply patches and updates provided by STMicroelectronics to ensure the security of the STM32 USB Host Library.