Executive Summary

The vulnerability exists in the Rocket.Chat DDP method autoTranslate.translateMessage in versions prior to 8.5.0 and several earlier versions. This method accepts a client-supplied IMessage object and passes it directly to translateMessage() without verifying the user's identity or their membership in the room.

As a result, any authenticated DDP user can read the content of any message by its ID from any room, including private channels, direct messages, and end-to-end encrypted rooms, by calling this method.

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Impact Analysis

This vulnerability allows unauthorized access to private message content. An attacker who is an authenticated user can read messages from any room without being a member of that room.

This can lead to exposure of sensitive or confidential information shared in private channels, direct messages, or even end-to-end encrypted rooms, compromising user privacy and data confidentiality.

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Detection Guidance

Detection of this vulnerability involves identifying unauthorized calls to the Rocket.Chat DDP method autoTranslate.translateMessage that bypass user authentication and room membership checks.

Since the vulnerability allows any authenticated DDP user to read messages by ID from any room, monitoring for unusual or unauthorized usage of the translateMessage method is key.

You can inspect Rocket.Chat server logs for calls to the translateMessage method and check if requests are coming from users who should not have access to certain messages or rooms.

• Use network traffic analysis tools (e.g., Wireshark or tcpdump) to capture DDP traffic and filter for translateMessage method calls.
• On the server, check logs or enable debug logging to capture calls to translateMessage and verify user IDs and room memberships.
• Example command to monitor logs (assuming logs contain method calls): `grep translateMessage /path/to/rocketchat/logs`
• Use Rocket.Chat's API or database queries to audit message access patterns for anomalies.

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Mitigation Strategies

The immediate mitigation step is to update Rocket.Chat to a version that includes the security fix which enforces proper server-side validation for the translateMessage method.

The fix includes verifying user authentication, input validation, message existence, and room membership before allowing message translation.

Until you can update, consider restricting access to the translateMessage method or disabling the auto-translate feature if possible.

Monitor and audit usage of the translateMessage method to detect and respond to unauthorized access attempts.

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Compliance Impact

This vulnerability allows any authenticated user to read the content of any message by ID from any room, including private channels, direct messages, and end-to-end encrypted rooms, without proper authorization checks.

Such unauthorized access to private and potentially sensitive communications could lead to violations of data privacy and protection regulations such as GDPR and HIPAA, which require strict controls over access to personal and sensitive information.

By exposing message content without verifying user identity or room membership, the vulnerability undermines confidentiality requirements mandated by these standards.

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