CVE-2024-39777: Malicious remote can invite itself to an arbitrary local channel
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 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.
Credit: responsibledisclosure@mattermost.com responsibledisclosure@mattermost.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| go/github.com/mattermost/mattermost/server/v8 | >=9.8.0<9.8.1 | 9.8.1 |
| 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 |
| go/github.com/mattermost/mattermost/server/v8 | >=9.9.0<9.9.1 | 9.9.1 |
| Mattermost | >=9.5.0<9.5.7 | |
| Mattermost | >=9.7.0<9.7.6 | |
| Mattermost | >=9.8.0<9.8.2 | |
| Mattermost | =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
Frequently Asked Questions
What is the severity of CVE-2024-39777?
CVE-2024-39777 has been classified as a high severity vulnerability.
How do I fix CVE-2024-39777?
To fix CVE-2024-39777, upgrade Mattermost to version 9.9.1, 9.8.2, 9.7.6, or 9.5.7 or higher.
Which versions of Mattermost are affected by CVE-2024-39777?
CVE-2024-39777 affects Mattermost versions 9.9.x up to 9.9.0, 9.5.x up to 9.5.6, 9.7.x up to 9.7.5, and 9.8.x up to 9.8.1.
What is the impact of CVE-2024-39777?
The impact of CVE-2024-39777 allows malicious remote users to send unsolicited invites to access local channels.
Are shared channels in Mattermost vulnerable due to CVE-2024-39777?
Yes, CVE-2024-39777 exposes vulnerabilities with shared channels when unsolicited invites are allowed.
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