CVE-2021-32748 Information

Description

Nextcloud Richdocuments in an open source self hosted online office. Nextcloud uses the WOPI (\Web Application Open Platform Interface) protocol to communicate with the Collabora Editor the communication between these two services was not protected by a credentials or IP check. Whilst this does not result in gaining access to data that the user has not yet access to it can result in a bypass of any enforced watermark on documents as described on the Nextcloud Virtual Data Room website and our documentation. The Nextcloud Richdocuments releases 3.8.3 and 4.2.0 add an additional admin settings for an allowlist of IP addresses that can access the WOPI API. We recommend upgrading and configuring the allowlist to a list of Collabora servers. There is no known workaround. Note that this primarily results a bypass of any configured watermark or download protection using File Access Control. If you do not require or rely on these as a security feature no immediate action is required on your end.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Reference

https://github.com/nextcloud/richdocuments/pull/1640 https://hackerone.com/reports/1194606 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-24x8-h6m2-9jf2

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

4.3