CVE-2021-25500 : What You Need to Know

A missing input validation in HDCP LDFW prior to SMR Nov-2021 Release 1 allows attackers to overwrite TZASC allowing TEE compromise.

Understanding CVE-2021-25500

This vulnerability affects Samsung Mobile Devices with specific chipsets and versions, enabling attackers to compromise the Trusted Execution Environment (TEE).

What is CVE-2021-25500?

CVE-2021-25500 is a security flaw in HDCP LDFW before SMR Nov-2021 Release 1, which could be exploited by attackers to overwrite TZASC and compromise the Trusted Execution Environment (TEE).

The Impact of CVE-2021-25500

With a CVSS base score of 7.2, this vulnerability has a high impact on confidentiality, integrity, and privileges required. Attackers can exploit this flaw locally without user interaction, leading to a compromised TEE.

Technical Details of CVE-2021-25500

This section provides detailed insights into the vulnerability.

Vulnerability Description

The vulnerability arises from a missing input validation in HDCP LDFW, allowing attackers to overwrite TZASC and compromise the TEE.

Affected Systems and Versions

Samsung Mobile Devices running specific chipsets like Exynos 980, 9820, 9830, and 2100 with Select Q(10.0) and R(11.0) versions are impacted.

Exploitation Mechanism

Attackers can locally exploit this vulnerability without user interaction, highlighting the critical nature of the issue.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial.

Immediate Steps to Take

Update devices to SMR Nov-2021 Release 1 or newer to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly update devices, apply security patches promptly, and follow cybersecurity best practices to enhance overall security.

Patching and Updates

Stay informed about security updates and ensure timely installation to protect devices from known vulnerabilities.