CWE
400
Advisory Published
Advisory Published
Updated

CVE-2024-1402: Denial of service in mattermost mobile apps and server via emoji reactions

First published: Fri Feb 09 2024(Updated: )

Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post. 

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

Affected SoftwareAffected VersionHow to fix
go/github.com/mattermost/mattermost/server/v8>=9.1.0<9.1.5
9.1.5
go/github.com/mattermost/mattermost/server/v8>=9.2.0<9.2.4
9.2.4
go/github.com/mattermost/mattermost/server/v8<8.1.8
8.1.8
Mattermost Mattermost Server<=8.1.7
Mattermost Mattermost Server>=9.0.0<=9.1.4
Mattermost Mattermost Server>=9.2.0<=9.2.3

Remedy

Update Mattermost Server to versions 9.3.0, 9.2.4, 9.1.5, 8.1.8 or higher.

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