CVE-2021-32655 Information

Description

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11 20.0.10 and 21.0.2 an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the \Create\ privileges of this unexpected share Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11 20.0.10 and 21.0.2. No workarounds are known to exist.

CVSS Vector

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

Reference

https://hackerone.com/reports/1167929 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

3.5