CVE-2021-36133 : Security Advisory and Response

A vulnerability has been identified in the OPTEE-OS CSU driver for NXP i.MX SoC devices, allowing TrustZone bypass due to a lack of security access configuration, enabling arbitrary memory read/write operations by the NonSecure World on Secure World memory using a DMA capable peripheral.

Understanding CVE-2021-36133

This section provides insights into the impact and technical details of the CVE.

What is CVE-2021-36133?

The OPTEE-OS CSU driver for NXP i.MX SoC devices fails to implement proper security access configuration, leading to TrustZone bypass and unauthorized memory access.

The Impact of CVE-2021-36133

The vulnerability permits the NonSecure World to conduct unauthorized memory operations on Secure World memory, potentially compromising system integrity and confidentiality.

Technical Details of CVE-2021-36133

Explore the specific technical aspects and implications of the CVE.

Vulnerability Description

The issue arises from the lack of security access configuration, allowing the NonSecure World to perform arbitrary memory read/write operations on the Secure World memory through a DMA-capable peripheral.

Affected Systems and Versions

The vulnerability affects the OPTEE-OS CSU driver for various models of NXP i.MX SoC devices.

Exploitation Mechanism

By exploiting the TrustZone bypass, threat actors can manipulate Secure World memory using the DMA peripheral from the NonSecure World.

Mitigation and Prevention

Learn how to address and prevent the exploitation of CVE-2021-36133.

Immediate Steps to Take

Promptly apply relevant security patches and updates to mitigate the TrustZone bypass vulnerability.

Long-Term Security Practices

Implement secure coding practices and access control mechanisms to prevent unauthorized memory access in the long run.

Patching and Updates

Regularly check for security advisories and updates from NXP to ensure the OPTEE-OS CSU driver is secure against TrustZone bypass attacks.