CVE-2021-43850: Denial of Service in discourse

First published: Tue Jan 04 2022(Updated: )

Discourse is an open source platform for community discussion. In affected versions admins users can trigger a Denial of Service attack via the `/message-bus/_diagnostics` path. The impact of this vulnerability is greater on multisite Discourse instances (where multiple forums are served from a single application server) where any admin user on any of the forums are able to visit the `/message-bus/_diagnostics` path. The problem has been patched. Please upgrade to 2.8.0.beta10 or 2.7.12. No workarounds for this issue exist.

Credit: security-advisories@github.com 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-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
	<2.7.12
	=2.8.0-beta1
	=2.8.0-beta2
	=2.8.0-beta3
	=2.8.0-beta4
	=2.8.0-beta5
	=2.8.0-beta6
	=2.8.0-beta7
	=2.8.0-beta8
	=2.8.0-beta9

Remedy

https://github.com/discourse/discourse/commit/7a8ec129fb54f188b2da6588c9d24d3a36eb0d39

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