CVE-2021-25470 : What You Need to Know

An improper caller check logic of SMC call in TEEGRIS secure OS prior to SMR Oct-2021 Release 1 can be used to compromise TEE.

Understanding CVE-2021-25470

This CVE highlights a vulnerability in Samsung Mobile Devices with Exynos and Mediatek chipsets running select versions of P(9.0), Q(10.0), and R(11.0), impacting the TEEGRIS secure OS.

What is CVE-2021-25470?

CVE-2021-25470 points out an improper caller check logic within the TEEGRIS secure OS, allowing attackers to compromise the Trusted Execution Environment (TEE) on affected devices.

The Impact of CVE-2021-25470

The impact of this CVE is rated as HIGH, with a base severity score of 7.9. It has a high confidentiality and integrity impact, requiring high privileges to exploit and resulting in a changed scope of operation.

Technical Details of CVE-2021-25470

This section dives into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from flawed SMC call logic checks in the TEEGRIS secure OS, enabling unauthorized access to the TEE on vulnerable Samsung Mobile Devices.

Affected Systems and Versions

Samsung Mobile Devices with Exynos and Mediatek chipsets running select versions of P(9.0), Q(10.0), and R(11.0) are affected by this vulnerability prior to SMR Oct-2021 Release 1.

Exploitation Mechanism

Attackers with high privileges can exploit this vulnerability locally, without requiring user interaction, to compromise the confidentiality and integrity of the TEE.

Mitigation and Prevention

Protective measures and actions to mitigate the impact of CVE-2021-25470.

Immediate Steps to Take

Users are advised to update their Samsung Mobile Devices to SMR Oct-2021 Release 1 or later to address the vulnerability and enhance system security.

Long-Term Security Practices

Maintain a proactive approach to system security by applying timely security updates, practicing secure coding standards, and implementing defense-in-depth strategies.

Patching and Updates

Regularly check for security updates from Samsung Mobile and apply patches promptly to safeguard devices against emerging threats.