Cross-Channel Message Deletion in Spacebar Server

Executive Summary

Spacebar Server before commit 8d126f4 has a vulnerability where authenticated users with MANAGE_MESSAGES permission in any channel can delete messages in other channels by routing delete requests through their own channel. The issue is in the single-delete and bulk-delete message handlers which fail to scope message queries to the requested channel.

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Detection Guidance

Check Spacebar Server logs for unusual message deletion patterns across channels. Look for DELETE requests from users with MANAGE_MESSAGES permission in unrelated channels. Verify if single-delete and bulk-delete handlers are properly scoping queries to the intended channel.

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Impact Analysis

An attacker with MANAGE_MESSAGES permission could delete messages in channels they do not have access to, potentially removing important or sensitive messages without authorization. This could lead to data loss, miscommunication, or unauthorized information removal.

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Compliance Impact

This vulnerability could lead to unauthorized deletion of sensitive data, violating compliance requirements for data integrity and retention. GDPR requires data integrity and accountability, while HIPAA mandates secure and accessible records. Unauthorized deletions may result in non-compliance.

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Mitigation Strategies

Update Spacebar Server to commit 8d126f4 or later. Remove MANAGE_MESSAGES permission from users unless absolutely necessary. Monitor for unauthorized message deletions and review audit logs regularly.

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