CVE-2021-32748 : Security Advisory and Response
Discover the impact of CVE-2021-32748 on Nextcloud Richdocuments. Learn about the vulnerability, affected versions, exploitation risks, and mitigation steps to secure your system.
Nextcloud Richdocuments uses the WOPI protocol to communicate with the Collabora Editor, leaving the WOPI API unprotected by credentials or IP check. This could lead to bypassing watermark protection on documents.
Understanding CVE-2021-32748
This CVE highlights a vulnerability in the communication process between Nextcloud Richdocuments and Collabora Editor, potentially allowing unauthorized access to confidential information.
What is CVE-2021-32748?
The vulnerability in Nextcloud Richdocuments allows attackers to bypass any configured watermark or download protection using File Access Control.
The Impact of CVE-2021-32748
While this vulnerability does not grant access to data users do not already have access to, it can result in the unauthorized bypass of enforced watermarks on documents within the Nextcloud platform.
Technical Details of CVE-2021-32748
Nextcloud Richdocuments versions prior to 3.8.3 and between 4.0.0 and 4.2.0 lack protection for the WOPI API, allowing for potential exploitability.
Vulnerability Description
The vulnerability arises from the lack of credentials or IP check protection on the communication channel between Nextcloud Richdocuments and Collabora Editor.
Affected Systems and Versions
Versions prior to 3.8.3 and between 4.0.0 to 4.2.0 of Nextcloud Richdocuments are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability to bypass any watermark protection in place on documents within the Nextcloud platform.
Mitigation and Prevention
To address CVE-2021-32748, immediate actions including upgrading to Richdocuments version 3.8.3 or 4.2.0 and configuring an IP address allowlist for WOPI API access are recommended.
Immediate Steps to Take
Upgrade Nextcloud Richdocuments to the latest patched versions and configure an IP allowlist to enhance security.
Long-Term Security Practices
Regularly update your Nextcloud Richdocuments installation and maintain proper access controls to mitigate future vulnerabilities.
Patching and Updates
Stay informed about security updates from Nextcloud Richdocuments and promptly apply any patches released to ensure ongoing protection against vulnerabilities.