CVE-2024-39839: Remote username set to an arbitrary string by remote user
First published: Thu Aug 01 2024(Updated: )
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.
Credit: responsibledisclosure@mattermost.com responsibledisclosure@mattermost.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| go/github.com/mattermost/mattermost/server/v8 | =9.9.0 | 9.9.1 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.8.0<9.8.2 | 9.8.2 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.7.0<9.7.6 | 9.7.6 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.5.0<9.5.7 | 9.5.7 |
| Mattermost Mattermost Server | >=9.5.0<9.5.7 | |
| Mattermost Mattermost Server | >=9.7.0<9.7.6 | |
| Mattermost Mattermost Server | >=9.8.0<9.8.2 | |
| Mattermost Mattermost Server | =9.9.0 |
Remedy
Update Mattermost to versions 9.10.0, 9.9.1, 9.5.7, 9.7.6, 9.8.2 or higher.
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Reference Links
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- alias/GHSA-vg6q-84p8-qvqh
- alias/CVE-2024-39839
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- vendor/mattermost
- canonical/mattermost mattermost server
- version/mattermost mattermost server/9.5.0
- version/mattermost mattermost server/9.7.0
- version/mattermost mattermost server/9.8.0
- version/mattermost mattermost server/9.9.0