CVE-2021-34379 : Exploit Details and Defense Strategies

Trusty contains a vulnerability in the HDCP service TA where bounds checking in command 10 is missing. The length of an I/O buffer parameter is not checked, which might lead to memory corruption.

Understanding CVE-2021-20657

This CVE affects NVIDIA Jetson AGX Xavier series, Jetson Xavier NX, Jetson TX2 series, Jetson TX2 NX running all Jetson Linux versions prior to r32.5.1.

What is CVE-2021-20657?

CVE-2021-34379 is a vulnerability in Trusty's HDCP service TA due to missing bounds checking in command 10, which could potentially result in memory corruption.

The Impact of CVE-2021-20657

The vulnerability has a CVSS base score of 7.7, classified as high severity. It can lead to information disclosure, escalation of privileges, and denial of service, requiring high privileges and user interaction.

Technical Details of CVE-2021-20657

The following technical details highlight the vulnerability in depth:

Vulnerability Description

The missing bounds checking in command 10 of Trusty's HDCP service TA allows an unchecked I/O buffer parameter length, posing a risk of memory corruption.

Affected Systems and Versions

All Jetson Linux versions prior to r32.5.1 running on NVIDIA Jetson AGX Xavier series, Jetson Xavier NX, Jetson TX2 series, Jetson TX2 NX are impacted by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited locally with high privileges required and user interaction, leading to a high impact on confidentiality, integrity, and availability.

Mitigation and Prevention

To safeguard systems from CVE-2021-20657, the following measures should be taken:

Immediate Steps to Take

Update NVIDIA Jetson devices to version r32.5.1 or later.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Implement least privilege access controls.
Regularly patch and update software and firmware.

Patching and Updates

Apply security patches released by NVIDIA promptly to mitigate the risk of exploitation.