CVE-2022-40760 : What You Need to Know

A Buffer Access with Incorrect Length Value vulnerability in the TEE_MACUpdate function in Samsung mTower through 0.3.0 allows a trusted application to trigger a Denial of Service (DoS) by invoking the function TEE_MACUpdate with an excessive size value of chunkSize.

Understanding CVE-2022-40760

This section will provide insights into the nature and impact of the vulnerability.

What is CVE-2022-40760?

CVE-2022-40760 refers to a Buffer Access with Incorrect Length Value vulnerability in the TEE_MACUpdate function in Samsung mTower through version 0.3.0. The vulnerability allows a trusted application to initiate a Denial of Service (DoS) attack.

The Impact of CVE-2022-40760

The impact of this vulnerability is the ability of a trusted application to trigger a Denial of Service by utilizing an inappropriate size value in the function TEE_MACUpdate.

Technical Details of CVE-2022-40760

In this section, we will delve into the technical aspects of the CVE.

Vulnerability Description

The vulnerability involves a Buffer Access issue that arises due to an incorrect length value in the TEE_MACUpdate function, enabling a DoS attack.

Affected Systems and Versions

The affected system is Samsung mTower through version 0.3.0, rendering it vulnerable to the described attack.

Exploitation Mechanism

The vulnerability can be exploited by invoking the TEE_MACUpdate function with a size value of chunkSize that exceeds the acceptable limit, leading to a Denial of Service.

Mitigation and Prevention

This section will provide guidance on how to mitigate and prevent the exploitation of CVE-2022-40760.

Immediate Steps to Take

Immediate actions include monitoring and restricting access to the vulnerable function, TEE_MACUpdate, and ensuring proper input validation to prevent oversized chunkSize values.

Long-Term Security Practices

Implementing secure coding practices, regular security audits, and maintaining up-to-date security protocols can help prevent similar vulnerabilities.

Patching and Updates

It is crucial to apply patches released by Samsung for mTower promptly to address and remediate the Buffer Access vulnerability in the TEE_MACUpdate function.