There are multiple components necessary to have a working mquery instance. Some of them require special care from a security standpoint.

Mquery is a standard web application written in Python. By default, everyone has permission to do everything. This default configuration is unsuitable for bigger organisations or public instances. In such cases, it's recommended to enable user accounts (see users.md), and disallow anonymous users or at least don't give them admin rights.

No special considerations. Every daemon process must have network access to Redis and UrsaDB.

Mquery web and daemon must have network access to Redis. No other access to the Redis database is necessary. There is no support for securing Redis with a password in the current version, so network isolation is the only way to prevent attacks. Most importantly, Redis must not be available from the public network.

Mquery daemons must have network access to their respective ursadb instances. Similarly to Redis, it's best to restrict network access to the UrsaDB instance. Ursadb protocol does not take malicious actors into account, and unauthenticated users can, for example, remove indexed data from the database, or cause a denial of service.

In the provided docker compose files, the UrsaDB user is overridden to root by default. This is for backwards compatibility, and to simplify deployment. For production instances consider running ursadb with the default user (ursa, UID 1000). This means that the shared index volume must be writable by UID 1000, and samples must be readable by UID 1000.

There is no dedicated email for reporting a security vulnerability. Please reach out to cert@cert.pl or one of the maintainers directly. If the vulnerability is not critical, the best way to report is via a GitHub issue.