CVE-2022-21684 Information

Description

Discourse is an open source discussion platform. Versions prior to 2.7.13 in stable 2.8.0.beta11 in beta and 2.8.0.beta11 in tests-passed allow some users to log in to a community before they should be able to do so. A user invited via email to a forum with must_approve_users enabled is going to be automatically logged in bypassing the check that does not allow unapproved users to sign in. They will be able to do everything an approved user can do. If they logout they cannot log back in. This issue is patched in the stable version 2.7.13 beta version 2.8.0.beta11 and tests-passed version 2.8.0.beta11. One may disable invites as a workaround. Administrators can increase min_trust_level_to_allow_invite to reduce the attack surface to more trusted users.

CVSS Vector

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

Reference

https://github.com/discourse/discourse/commit/584c6a2e8bc705072b09a9c4b55126d6f8ed4ad2 https://github.com/discourse/discourse/security/advisories/GHSA-p63q-jp48-h8xh https://meta.discourse.org/t/invite-redemption-allowed-user-to-access-forum-before-approval/214328

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8