CVE-2023-4020 : What You Need to Know

This CVE-2023-4020 analysis provides details on an unvalidated input vulnerability in Silicon Labs TrustZone implementation.

Understanding CVE-2023-4020

This vulnerability allows unauthorized access to secure memory from non-secure memory due to an unvalidated input in a library function in Silicon Labs TrustZone implementation.

What is CVE-2023-4020?

The vulnerability in Silicon Labs TrustZone allows an attacker to read/write memory in the secure region from the non-secure memory due to unvalidated input in a library function responsible for communication between secure and non-secure memory.

The Impact of CVE-2023-4020

The impact of this vulnerability is categorized as critical with high confidentiality and integrity impacts. It involves CAPEC-129 Pointer Manipulation.

Technical Details of CVE-2023-4020

This section delves into the technical specifics of the CVE-2023-4020 vulnerability.

Vulnerability Description

The vulnerability stems from unvalidated input in a library function responsible for secure-non-secure memory communication in Silicon Labs TrustZone, enabling unauthorized memory access.

Affected Systems and Versions

The affected product is GSDK by silabs.com with version 1.0 and versions less than 4.4.0, making them vulnerable to this exploit.

Exploitation Mechanism

Attack complexity is low for this vulnerability, with an attack vector being local. Privileges are not required, and the scope is changed, allowing for high impact on confidentiality and integrity.

Mitigation and Prevention

To address and prevent the CVE-2023-4020 vulnerability, certain measures can be taken for immediate mitigation and long-term prevention.

Immediate Steps to Take

Update affected systems to version 4.4.0 or newer to mitigate the vulnerability.
Implement proper input validation mechanisms in software development practices.

Long-Term Security Practices

Regularly monitor for security updates and patches from Silicon Labs for their products.
Conduct security audits to identify and address potential vulnerabilities in the TrustZone implementation.

Patching and Updates

Visit the provided references to access the latest patches and updates from Silicon Labs to secure the affected systems.