CVE-2021-37628 : Security Advisory and Response

Nextcloud Richdocuments is an open-source office suite where the File Drop feature can be exploited via the Richdocuments app. Upgrading to specific versions or disabling Richdocuments is advised.

Understanding CVE-2021-37628

This CVE revolves around a vulnerability in Nextcloud Richdocuments that allows attackers to read arbitrary files in File Drop shares.

What is CVE-2021-37628?

The CVE-2021-37628 vulnerability concerns the Richdocuments app in Nextcloud, enabling unauthorized file access in affected versions.

The Impact of CVE-2021-37628

With a high severity base score of 7.5, this CVE poses a significant risk to confidentiality in compromised Nextcloud environments.

Technical Details of CVE-2021-37628

The technical aspects of CVE-2021-37628 shed light on the vulnerability's description, affected systems, and the exploitation method.

Vulnerability Description

The Richdocuments app in Nextcloud allows attackers to bypass File Drop security measures, potentially leading to unauthorized file access.

Affected Systems and Versions

Versions prior to 3.8.4 and those between 4.0.0 and 4.2.1 are susceptible to this exploit, exposing Nextcloud instances to risks.

Exploitation Mechanism

By leveraging the Richdocuments app, threat actors can circumvent File Drop restrictions and gain access to sensitive files within Nextcloud.

Mitigation and Prevention

Understanding the immediate steps and long-term measures to address CVE-2021-37628 is crucial for ensuring Nextcloud security.

Immediate Steps to Take

Upgrade Nextcloud Richdocuments to version 3.8.4 or 4.2.1 promptly to mitigate the risk of file leakage through the Richdocuments app.

Long-Term Security Practices

Regularly monitor Nextcloud security advisories and implement security best practices to prevent unauthorized access and data breaches.

Patching and Updates

Stay informed about security patches and updates for Nextcloud Richdocuments to address known vulnerabilities and enhance platform security.