CVE-2022-21677: Group advanced search option may leak group and group's members visibility

First published: Fri Jan 14 2022(Updated: )

Discourse is an open source discussion platform. Discourse groups can be configured with varying visibility levels for the group as well as the group members. By default, a newly created group has its visibility set to public and the group's members visibility set to public as well. However, a group's visibility and the group's members visibility can be configured such that it is restricted to logged on users, members of the group or staff users. A vulnerability has been discovered in versions prior to 2.7.13 and 2.8.0.beta11 where the group advanced search option does not respect the group's visibility and members visibility level. As such, a group with restricted visibility or members visibility can be revealed through search with the right search option. This issue is patched in `stable` version 2.7.13, `beta` version 2.8.0.beta11, and `tests-passed` version 2.8.0.beta11 versions of Discourse. There are no workarounds aside from upgrading.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Discourse Discourse	<=2.7.12
Discourse Discourse	=2.8.0-beta1
Discourse Discourse	=2.8.0-beta10
Discourse Discourse	=2.8.0-beta2
Discourse Discourse	=2.8.0-beta3
Discourse Discourse	=2.8.0-beta4
Discourse Discourse	=2.8.0-beta5
Discourse Discourse	=2.8.0-beta6
Discourse Discourse	=2.8.0-beta7
Discourse Discourse	=2.8.0-beta8
Discourse Discourse	=2.8.0-beta9

Remedy

https://github.com/discourse/discourse/commit/fff8b98485561b12d070c0a8c39f4e503813ab44

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