CVE-2021-32658 : Security Advisory and Response

Nextcloud Android, the client for the Nextcloud open-source cloud system, may not properly clean sensitive data on account removal, potentially exposing sensitive information including encryption keys. Upgrading to Nextcloud Android App version 3.16.1 is recommended.

Understanding CVE-2021-32658

This CVE highlights a critical vulnerability in Nextcloud Android that could lead to the exposure of sensitive information.

What is CVE-2021-32658?

The CVE-2021-32658 vulnerability pertains to Nextcloud Android failing to clean sensitive data upon account removal, possibly revealing critical information like encryption keys.

The Impact of CVE-2021-32658

With a CVSS base score of 4.7, this vulnerability poses a medium risk to systems. It could result in the exposure of high confidentiality information to unauthorized actors.

Technical Details of CVE-2021-32658

This section outlines the technical aspects of the CVE.

Vulnerability Description

The vulnerability in Nextcloud Android results from a timeout issue causing the failure to properly sanitize sensitive data during account removal.

Affected Systems and Versions

Nextcloud Android versions earlier than 3.16.1 are affected by this vulnerability.

Exploitation Mechanism

An attacker with low privileges can exploit this vulnerability locally to gain access to sensitive key material.

Mitigation and Prevention

To safeguard systems from CVE-2021-32658, immediate actions and long-term security practices are recommended.

Immediate Steps to Take

Upgrade Nextcloud Android App to version 3.16.1 to mitigate the vulnerability and ensure sensitive data is properly cleaned on account removal.

Long-Term Security Practices

Institute robust security measures including regular software updates, user training on secure practices, and monitoring for unauthorized access.

Patching and Updates

Stay informed about security advisories and promptly apply patches and updates to address potential vulnerabilities.