# CVE-2023-41893: Home Assistant vulnerable to account takeover via auth_callback login

Source: https://junglewise.ai/threats/cve-2023-41893-home-assistant-vulnerable-to-account-takeover-via-auth-callback  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-10-20  
License: CC BY 4.0 with a link back

CVE-2023-41893 · Severity: low · CVSS 3.1 · Published 2023-10-20

Home assistant is an open source home automation. The audit team’s analyses confirmed that the `redirect_uri` and `client_id` are alterable when logging in. Consequently, the code parameter utilized to fetch the `access_token` post-authentication will be sent to the URL specified in the aforementioned parameters. Since an arbitrary URL is permitted and `homeassistant.local` represents the preferred, default domain likely used and trusted by many users, an attacker could leverage this weakness to manipulate a user and retrieve account access. Notably, this attack strategy is plausible if the victim has exposed their Home Assistant to the Internet, since after acquiring the victim’s `access_token` the adversary would need to utilize it directly towards the instance to achieve any pertinent malicious actions. To achieve this compromise attempt, the attacker must send a link with a `redirect_uri` that they control to the victim’s own Home Assistant instance. In the eventuality the victim authenticates via said link, the attacker would obtain code sent to the specified URL in `redirect_uri`, which can then be leveraged to fetch an `access_token`. Pertinently, an attacker could increase the efficacy of this strategy by registering a near identical domain to `homeassistant.local`, which at first glance may appear legitimate and thereby obfuscate any malicious intentions. This issue has been addressed in version 2023.9.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Technologies: [homeassistant (PyPI)](https://junglewise.ai/threats/technologies/homeassistant). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2023-41893 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-41893 being exploited in the wild.

**How severe is CVE-2023-41893?** Low severity, with a CVSS score of 3.1, published 20 October 2023.

**Which products and versions are affected?** homeassistant (PyPI) ECOSYSTEM:introduced=0,fixed=2023.9.0.

**Is there a fix for CVE-2023-41893?** Yes. homeassistant (PyPI): upgrade to 2023.9.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-41893?** Check whether you run homeassistant (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- homeassistant (PyPI): upgrade to 2023.9.0 or later

  ```sh
  pip install "homeassistant>=2023.9.0"
  ```


## Affected products

- homeassistant (PyPI) ECOSYSTEM:introduced=0,fixed=2023.9.0

## Identifiers

- CVE-2023-41893
- GHSA-qhhj-7hrc-gqj5
- PYSEC-2023-214

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