CVE-2021-41166 Explained : Impact and Mitigation

The Nextcloud Android app versions prior to 3.17.1 may allow unauthorized access to sensitive information.

Understanding CVE-2021-41166

The vulnerability in the Nextcloud Android app could lead to unauthorized viewing of image thumbnails.

What is CVE-2021-41166?

The Nextcloud Android app, a client for the self-hosted platform, contains a vulnerability allowing unauthorized access to image thumbnails.

The Impact of CVE-2021-41166

Confidentiality Impact: Low
Integrity Impact: None
Attack Vector: Network
Attack Complexity: Low

Technical Details of CVE-2021-41166

The technical aspects of the Nextcloud Android app vulnerability.

Vulnerability Description

The issue allows unauthorized apps without

MANAGE_DOCUMENTS

permission to view image thumbnails not meant for them.

Affected Systems and Versions

Product: security-advisories
Vendor: Nextcloud
Versions Affected: < 3.17.1

Exploitation Mechanism

The vulnerability can be exploited via unauthorized apps accessing image thumbnails.

Mitigation and Prevention

Ways to mitigate and prevent exploitation of CVE-2021-41166.

Immediate Steps to Take

Update Nextcloud Android app to version 3.17.1
Regularly monitor for security advisories

Long-Term Security Practices

Review app permissions and access controls
Educate users on data security best practices
Implement robust security testing procedures

Patching and Updates

Apply patches promptly after release to address security vulnerabilities.