CVE-2021-34391 Explained : Impact and Mitigation

Trusty contains a vulnerability in the NVIDIA TLK kernel function where a lack of checks allows the exploitation of an integer overflow through a specific SMC call triggered by the user, leading to denial of service.

Understanding CVE-2021-34391

This CVE affects NVIDIA Jetson TX1 devices running all Jetson Linux versions prior to r32.5.1.

What is CVE-2021-34391?

Trusty is vulnerable due to a lack of checks in the NVIDIA TLK kernel function, enabling an attacker to trigger an integer overflow through a specific SMC call by the user, which can result in a denial of service.

The Impact of CVE-2021-34391

The impact of this vulnerability is rated as medium with a CVSS base score of 5.3. It requires low privileges but user interaction is necessary. The attack complexity is high with a local attack vector and high availability impact.

Technical Details of CVE-2021-34391

This section will delve into the specifics of the vulnerability.

Vulnerability Description

The vulnerability in Trusty allows for an integer overflow through a specific SMC call, triggered by the user, potentially causing a denial of service.

Affected Systems and Versions

The vulnerability affects all Jetson Linux versions prior to r32.5.1 running on NVIDIA Jetson TX1 devices.

Exploitation Mechanism

The exploitation occurs through a specific SMC call that triggers an integer overflow due to a lack of checks in the NVIDIA TLK kernel function.

Mitigation and Prevention

To address CVE-2021-34391, follow the mitigation strategies outlined below.

Immediate Steps to Take

Update the NVIDIA Jetson TX1 device to version r32.5.1 or later to patch the vulnerability.
Monitor for any unusual system behavior that may indicate a denial of service attack.

Long-Term Security Practices

Implement regular security updates and patch management protocols to address vulnerabilities promptly.
Educate users on safe computing practices and the importance of device security.

Patching and Updates

Stay informed about security advisories from NVIDIA and apply patches promptly to ensure the ongoing security of your systems.