CVE-2021-25478 : Security Advisory and Response

A possible stack-based buffer overflow vulnerability in Exynos CP Chipset prior to SMR Oct-2021 Release 1 allows arbitrary memory write and code execution.

Understanding CVE-2021-25478

This section provides insights into the critical details of CVE-2021-25478.

What is CVE-2021-25478?

CVE-2021-25478 is a stack-based buffer overflow vulnerability found in Exynos CP Chipset before the SMR Oct-2021 Release 1, enabling attackers to execute arbitrary code and manipulate memory.

The Impact of CVE-2021-25478

With a CVSS v3.1 base score of 7.2, CVE-2021-25478 poses a high severity threat with impacts on confidentiality, integrity, and availability. The vulnerability requires high privileges and can be exploited via a low-complexity attack vector over a network.

Technical Details of CVE-2021-25478

This section outlines the technical aspects of CVE-2021-25478.

Vulnerability Description

The vulnerability arises due to a stack-based buffer overflow in the Exynos CP Chipset, allowing malicious actors to overwrite memory contents and achieve code execution.

Affected Systems and Versions

Samsung Mobile Devices running versions up to and excluding SMR Oct-2021 Release 1 are vulnerable to this exploit, including O(8.1), P(9.0), Q(10.0), and R(11.0).

Exploitation Mechanism

Through a network-based attack with low complexity, threat actors can trigger the buffer overflow, compromising the confidentiality, integrity, and availability of the affected systems.

Mitigation and Prevention

This section advises on the steps to mitigate and prevent exploitation of CVE-2021-25478.

Immediate Steps to Take

Users are strongly recommended to update their Samsung Mobile Devices to the SMR Oct-2021 Release 1 or later to patch the vulnerability. Implementing network security controls and monitoring can also help detect potential attacks.

Long-Term Security Practices

Maintaining up-to-date software versions, conducting regular security assessments, and educating users on safe online practices can enhance overall security posture against similar vulnerabilities.

Patching and Updates

Regularly check for security updates from Samsung Mobile and apply patches promptly to ensure protection against known vulnerabilities.