CVE-2021-40834 : Exploit Details and Defense Strategies

A user interface overlay vulnerability was discovered in F-Secure SAFE Browser for Android, allowing a remote attacker to perform a spoofing attack.

Understanding CVE-2021-40834

This CVE details a vulnerability in F-Secure Mobile Security's SAFE Browser for Android, impacting versions less than 17.9* and version 18.5x.

What is CVE-2021-40834?

The vulnerability in F-Secure SAFE Browser for Android enables a remote attacker to trigger a full-screen mode by prompting users to click on a specially crafted URL, hiding the user interface. This operation can lead to a spoofing attack.

The Impact of CVE-2021-40834

The CVSS v3.1 base score for this vulnerability is 4.3, categorizing it as a medium-severity issue. The attack complexity is low, requiring a high level of privileges, and user interaction is necessary.

Technical Details of CVE-2021-40834

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability allows a remote attacker to manipulate the user interface in F-Secure SAFE Browser for Android, potentially enabling a spoofing attack.

Affected Systems and Versions

Affected Platform: Android
Affected Product: F-Secure Mobile Security
Affected Version: Less than 17.9* and version 18.5x (custom)

Exploitation Mechanism

The attacker lures users to click on a malicious URL, triggering full-screen mode and hiding the user interface to execute a spoofing attack.

Mitigation and Prevention

Preventive measures and solutions for CVE-2021-40834.

Immediate Steps to Take

Upgrade to version 18.5.x available on Google Play for a fix.

Long-Term Security Practices

Exercise caution when clicking on URLs to prevent similar spoofing attempts.

Patching and Updates

Regularly update F-Secure Mobile Security to ensure protection against known vulnerabilities.