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Mattermost vulnerable to denial of service via large number of emoji reactions

Moderate severity GitHub Reviewed Published Feb 9, 2024 to the GitHub Advisory Database • Updated May 31, 2024

Package

gomod github.com/mattermost/mattermost/server/v8 (Go)

Affected versions

< 8.1.8
>= 9.2.0, < 9.2.4
>= 9.1.0, < 9.1.5

Patched versions

8.1.8
9.2.4
9.1.5

Description

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. Fetching posts with huge amounts of reactions results in Uncontrolled Resource Consumption.

References

Published by the National Vulnerability Database Feb 9, 2024
Published to the GitHub Advisory Database Feb 9, 2024
Reviewed Feb 9, 2024
Last updated May 31, 2024

Severity

Moderate
4.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Weaknesses

CVE ID

CVE-2024-1402

GHSA ID

GHSA-32h7-7j94-8fc2

Source code

Credits

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