CVE-2021-32689 Information

Description

Nextcloud Talk is a fully on-premises audio/video and chat communication service. In versions prior to 11.2.2 if a user was able to reuse an earlier used username they could get access to any chat message sent to the previous user with this username. The issue was patched in versions 11.2.2 and 11.3.0. As a workaround don’t allow users to choose usernames themselves. This is the default behaviour of Nextcloud but some user providers may allow doing so.

CVSS Vector

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

Reference

https://github.com/nextcloud/spreed/pull/5633 https://hackerone.com/reports/1200700 https://github.com/nextcloud/spreed/releases/tag/v11.3.0 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895c https://github.com/nextcloud/spreed/releases/tag/v11.2.2

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5