CVE-2021-25521 Explained : Impact and Mitigation

A security vulnerability, CVE-2021-25521, in Samsung Internet versions earlier than 16.0.2 allows untrusted applications to access the current tab URL in Samsung Internet.

Understanding CVE-2021-25521

This section provides an overview of the vulnerability and its potential impact.

What is CVE-2021-25521?

The insecure caller check in the sharevia deeplink logic before Samsung Internet 16.0.2 enables untrusted applications to retrieve the current tab URL in Samsung Internet.

The Impact of CVE-2021-25521

With a CVSS base score of 4, this vulnerability has a medium severity rating. Attack complexity is low, and it requires local access to the device. While no privileges are needed for exploitation, the confidentiality impact is low.

Technical Details of CVE-2021-25521

In this section, we delve into the technical aspects of the CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The flaw arises from improper authorization (CWE-285), allowing unauthorized access to the current tab URL in Samsung Internet versions preceding 16.0.2.

Affected Systems and Versions

The vulnerability impacts Samsung Internet versions less than 16.0.2.

Exploitation Mechanism

Untrusted applications can exploit the vulnerability to obtain the current tab URL in Samsung Internet without the necessary authorization.

Mitigation and Prevention

Here, we discuss the steps users can take to mitigate the risks posed by CVE-2021-25521.

Immediate Steps to Take

Users should update Samsung Internet to version 16.0.2 or newer to address the vulnerability. Avoid clicking on suspicious links or visiting untrusted websites to prevent exploitation.

Long-Term Security Practices

Practice caution while granting permissions to applications and regularly update all software to patch known security vulnerabilities.

Patching and Updates

Stay informed about security updates from Samsung Mobile and promptly apply patches to ensure protection against emerging threats.