CWE
400
Advisory Published
Advisory Published
Updated

CVE-2024-47003: DoS via non-string message using permalink embed

First published: Thu Sep 26 2024(Updated: )

Mattermost does not strip `embeds` from `metadata` when broadcasting `posted` events. This allows users to include arbitrary embeds in posts, which are then broadcasted via websockets. This can be exploited in many ways, for example to create permalinks with fully customizable content or to trigger a client Side Denial of Service (DoS) by sending a permalink with a non-string message. The advisory metadata references the appropriate go pseudo version available from pkg.go.dev

Credit: responsibledisclosure@mattermost.com responsibledisclosure@mattermost.com

Affected SoftwareAffected VersionHow to fix
Mattermost Mattermost Server>=9.5.0<9.5.9
Mattermost Mattermost Server=9.11.0
Mattermost Mattermost Server=9.11.0-rc1
Mattermost Mattermost Server=9.11.0-rc2
Mattermost Mattermost Server=9.11.0-rc3
go/github.com/mattermost/mattermost/server/v8<8.0.0-20240806094731-69a8b3df0f9f
8.0.0-20240806094731-69a8b3df0f9f

Remedy

Update Mattermost to versions 10.0.0, 9.11.1, 9.5.9 or higher.

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