CVE-2021-41256 Explained : Impact and Mitigation

Nextcloud news-android is an Android client for the Nextcloud news/feed reader app. In affected versions, a security issue allows a malicious application on the same device to send an arbitrary Intent that can lead to unintended access to sensitive data. Users are urged to update to version 0.9.9.63 or newer.

Understanding CVE-2021-41256

This CVE pertains to Intent URI permissions manipulation in nextcloud news-android.

What is CVE-2021-41256?

CVE-2021-41256 refers to a vulnerability in Nextcloud news-android that enables a malicious app on the same device to send an Intent, resulting in unauthorized access to non-exported Content Providers.

The Impact of CVE-2021-41256

The vulnerability has a CVSS base score of 5.8, with high confidentiality and integrity impacts. It requires high privileges and user interaction locally, posing a medium severity threat.

Technical Details of CVE-2021-41256

This section outlines the technical aspects of CVE-2021-41256.

Vulnerability Description

The security flaw allows a malicious app to exploit Intent URI permissions, accessing Content Providers unintentionally.

Affected Systems and Versions

Product: news-android
Vendor: Nextcloud
Versions Affected: < 0.9.9.63

Exploitation Mechanism

The vulnerability can be exploited by a malicious app on the same device sending an arbitrary Intent to gain unauthorized access.

Mitigation and Prevention

To address CVE-2021-41256, users and organizations should take immediate and long-term security measures.

Immediate Steps to Take

Upgrade Nextcloud News for Android to version 0.9.9.63 or higher promptly.

Long-Term Security Practices

Regularly update the app to the latest version to patch security vulnerabilities.
Avoid downloading apps from untrusted sources.

Patching and Updates

Stay informed about security advisories from Nextcloud and apply patches promptly.