CWE
400
Advisory Published
Advisory Published
Updated

CVE-2023-5196: DoS via Channel Notification Properties

First published: Fri Sep 29 2023(Updated: )

Mattermost fails to enforce character limits in all possible notification props allowing an attacker to send a really long value for a notification_prop resulting in the server consuming an abnormal quantity of computing resources and possibly becoming temporarily unavailable for its users.

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

Affected SoftwareAffected VersionHow to fix
Mattermost Mattermost>=7.0.0<7.8.10
Mattermost Mattermost>=8.0.0<8.0.2
Mattermost Mattermost>=8.1.0<8.1.1
go/github.com/mattermost/mattermost-server/v6<7.8.10
7.8.10
go/github.com/mattermost/mattermost/server/v8>=8.0.0<8.0.2
8.0.2
go/github.com/mattermost/mattermost/server/v8=8.1.0
8.1.1
>=7.0.0<7.8.10
>=8.0.0<8.0.2
>=8.1.0<8.1.1

Remedy

Update Mattermost Server to versions 7.8.10, 8.0.2, 8.1.1 or higher.

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Frequently Asked Questions

  • What is CVE-2023-5196?

    CVE-2023-5196 is a vulnerability in Mattermost that allows an attacker to send a really long value for a notification_prop, causing the server to consume an abnormal quantity of computing resources and possibly become temporarily unavailable.

  • How does CVE-2023-5196 impact Mattermost users?

    CVE-2023-5196 can lead to server overload and unavailability, affecting the normal usage of Mattermost by its users.

  • What is the severity of CVE-2023-5196?

    CVE-2023-5196 has a severity rating of medium with a CVSS score of 6.5.

  • Which versions of Mattermost are affected by CVE-2023-5196?

    Mattermost versions up to and including 8.0.2 are affected by CVE-2023-5196.

  • How can I fix CVE-2023-5196?

    To fix CVE-2023-5196, upgrade Mattermost to version 8.1.1 or later.

Contact

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