CVE-2021-43863 : Security Advisory and Response

The Nextcloud Android app prior to version 3.18.1 is affected by an SQL injection vulnerability, allowing malicious apps to access data.

Understanding CVE-2021-43863

What is CVE-2021-43863?

The Nextcloud Android app uses content providers to manage its data. Prior to version 3.18.1, two providers have security issues, enabling malicious apps on the same device to bypass permission controls.

The Impact of CVE-2021-43863

The vulnerability has a CVSS base score of 7.5, indicating a high severity issue with high confidentiality impact. Although no known workarounds exist, users should upgrade to version 3.18.1 for a patch.

Technical Details of CVE-2021-43863

Vulnerability Description

The vulnerability allows for SQL injection in the

FileContentProvider

of the Nextcloud Android app.

Affected Systems and Versions

Product: Android
Vendor: Nextcloud
Versions Affected: < 3.18.1

Exploitation Mechanism

Malicious apps on the same device can exploit the SQL injection vulnerability to access Nextcloud's data.

Mitigation and Prevention

Immediate Steps to Take

Upgrade the Nextcloud Android app to version 3.18.1 to apply the necessary patch.

Long-Term Security Practices

Regularly update all software to the latest versions.

Patching and Updates

Ensure timely installation of patches and updates from Nextcloud to mitigate the vulnerability.