Home Assistant Core and Supervisor are integral components of the popular open-source home automation system, Home Assistant. The Home Assistant Core is responsible for managing all aspects of home automation such as lighting, climate control, security systems, and more. It is essentially the brain of the home automation network. Meanwhile, the Supervisor is responsible for overseeing the management of operating system-level tasks and software updates for the Home Assistant Core.
The CVE-2023-27482 vulnerability detected in Home Assistant is a remotely exploitable vulnerability that bypasses authentication for accessing the Supervisor API through Home Assistant. This means that an attacker can gain access to the Supervisor API and execute any command they desire without requiring any type of authentication. This vulnerability only affects installations that use the Supervisor 2023.01.1 or older. Home Assistant Container and Home Assistant Core installations that are manually set up in a Python environment are not affected.
When exploited, the CVE-2023-27482 vulnerability can lead to a complete takeover of the Home Assistant instance. Attackers can execute any command via the Supervisor API, making them capable of taking full control of any connected smart devices within the home automation network. This puts users' privacy and security at risk and could lead to significant damage if not promptly addressed.
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REFERENCES
- https://github.com/elttam/publications/blob/master/writeups/home-assistant/supervisor-authentication-bypass-advisory.md
- https://github.com/home-assistant/core/security/advisories/GHSA-2j8f-h4mr-qr25
- https://www.elttam.com/blog/pwnassistant/
- https://www.home-assistant.io/blog/2023/03/08/supervisor-security-disclosure/
To protect against this vulnerability, users can take the following precautions:
- Upgrade to at least Home Assistant Core 2023.3.0 or later, which includes mitigation for this vulnerability.
- Make sure that the Home Assistant Supervisor and Core applications are always up to date with the latest releases.
- Do not expose Home Assistant instances to the internet.
- Use a firewall to restrict access to the Home Assistant instance from external networks.
- Disable Supervisor API access altogether if it is not necessary for your use case.
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