CVE-2021-25518 : Security Advisory and Response

An improper boundary check in secure_log of LDFW and BL31 prior to SMR Dec-2021 Release 1 allows arbitrary memory write and code execution.

Understanding CVE-2021-25518

This CVE affects Samsung Mobile Devices with specific Exynos chipsets and certain software versions.

What is CVE-2021-25518?

CVE-2021-25518 highlights an improper boundary check vulnerability in the secure log components of Samsung's LDFW and BL31, paving the way for unauthorized memory write actions and potential code execution.

The Impact of CVE-2021-25518

With a CVSS base score of 6.4, this medium-severity vulnerability poses a high risk to confidentiality, integrity, and availability of affected devices. The attack requires high privileges and occurs locally without user interaction.

Technical Details of CVE-2021-25518

This section provides intricate details about the vulnerability, its impact, and affected systems.

Vulnerability Description

The vulnerability arises from an improper boundary check in secure_log of LDFW and BL31 up to SMR Dec-2021 Release 1, enabling malicious actors to perform arbitrary memory write operations and potentially execute unauthorized code.

Affected Systems and Versions

Samsung Mobile Devices running P(9.0), Q(10.0), R(11.0) software versions with selected Exynos chipsets are affected by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by an attacker with high privileges locally, without the need for user interaction. Successful exploitation could lead to severe consequences for device confidentiality, integrity, and availability.

Mitigation and Prevention

Here are the steps users can take to mitigate the risks associated with CVE-2021-25518.

Immediate Steps to Take

Users of affected Samsung Mobile Devices should apply security patches provided by Samsung promptly to safeguard their devices against potential exploitation.

Long-Term Security Practices

In the long term, maintaining up-to-date software versions and applying security updates as soon as they are released is crucial to ensure protection against known vulnerabilities.

Patching and Updates

Regularly check for security updates from Samsung Mobile and apply them without delay to address security vulnerabilities and enhance the overall security posture of your devices.