cve-2023-47106
Vulnerability from cvelistv5
Published
2023-12-04 20:26
Modified
2024-08-02 21:01
Severity ?
EPSS score ?
Summary
Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. This vulnerability has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
References
Impacted products
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ghsa-fvhj-4qfh-q2hm
Vulnerability from github
Published
2023-12-05 18:11
Modified
2023-12-07 23:06
Severity ?
Summary
Traefik incorrectly processes fragment in the URL, leads to Authorization Bypass
Details
Summary
When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates the RFC because in the origin-form the URL should only contain the absolute path and the query.
When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions.
Details
For example, we have this Nginx configuration:
location /admin {
deny all;
return 403;
}
This can be bypassed when the attacker is requesting to /#/../admin
This won’t be vulnerable if the backend server follows the RFC and ignores any characters after the fragment.
However, if Nginx is chained with another reverse proxy which automatically URL encode the character # (Traefik) the URL will become
/%23/../admin
And allow the attacker to completely bypass the Access Restriction from the Nginx Front-End proxy.
Here is a diagram to summarize the attack:
PoC
This is the POC docker I've set up. It contains Nginx, Traefik proxies and a backend server running PHP.
https://drive.google.com/file/d/1vLnA0g7N7ZKhLNmHmuJ4JJjV_J2akNMt/view?usp=sharing
Impact
This allows the attacker to completely bypass the Access Restriction from Front-End proxy.
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"details": "### Summary\nWhen a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates the RFC because in the origin-form the URL should only contain the absolute path and the query.\n\nWhen this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control\nrestrictions. \n\n### Details\nFor example, we have this Nginx configuration:\n\n```\nlocation /admin {\n deny all;\n return 403;\n}\n```\nThis can be bypassed when the attacker is requesting to /#/../admin\n\nThis won\u2019t be vulnerable if the backend server follows the RFC and ignores any characters after the fragment.\n\nHowever, if Nginx is chained with another reverse proxy which automatically URL encode the character # (Traefik) the URL will become\n\n/%23/../admin\n\nAnd allow the attacker to completely bypass the Access Restriction from the Nginx Front-End proxy.\n\nHere is a diagram to summarize the attack:\n\n\n\n### PoC\n\n\nThis is the POC docker I\u0027ve set up. It contains Nginx, Traefik proxies and a backend server running PHP.\n\nhttps://drive.google.com/file/d/1vLnA0g7N7ZKhLNmHmuJ4JJjV_J2akNMt/view?usp=sharing\n\n### Impact\nThis allows the attacker to completely bypass the Access Restriction from Front-End proxy.",
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}
gsd-2023-47106
Vulnerability from gsd
Modified
2023-12-13 01:20
Details
Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain the absolute path and the query. When this is combined with another frontend proxy like Nginx, it can be used to bypass frontend proxy URI-based access control restrictions. This vulnerability has been addressed in versions 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Aliases
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"refsource": "",
"tags": [
"Not Applicable"
],
"url": "https://datatracker.ietf.org/doc/html/rfc7230#section-5.3.1"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.10.6",
"refsource": "",
"tags": [
"Release Notes"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.10.6"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5",
"refsource": "",
"tags": [
"Release Notes"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5"
}
]
}
},
"impact": {
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 2.5
}
},
"lastModifiedDate": "2023-12-07T21:01Z",
"publishedDate": "2023-12-04T21:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.