Mattermost Handler Panic via Post-Action Request

Executive Summary

Mattermost versions up to and including 11.9, 11.0.9, 11.4.8, 11.7.7, and 10.22.11.0 have a flaw where they fail to recover from handler panics triggered by post-action requests with unexpected field types. This allows an authenticated user to crash the plugin.

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Detection Guidance

This vulnerability can be detected by checking Mattermost server logs for plugin crashes or unexpected handler panics. Look for error messages related to post-action requests with unexpected field types. Ensure Mattermost is updated to versions 11.9, 11.0.9, 11.4.8, 11.7.7, or 10.22.11.0 or later to mitigate the issue.

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Impact Analysis

An authenticated attacker could exploit this to crash a Mattermost plugin, causing service disruption for users relying on that plugin. This may lead to temporary unavailability of plugin features.

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Compliance Impact

The vulnerability allows an authenticated user to crash the plugin via a post-action request with an unexpected field type. This could lead to denial-of-service conditions, potentially disrupting operations. However, the provided text does not specify direct impacts on GDPR or HIPAA compliance.

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Mitigation Strategies

Update Mattermost to a version higher than 11.9, 11.0.9, 11.4.8, 11.7.7, or 10.22.11.0 to address the handler panic issue.

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