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CVE-2023-47106— Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Containous Traefik是美国Containous公司的一款反向代理和负载平衡器。 Traefik v2.10.5及之前、 v3.0.0-beta4及之前版本存在输入验证错误漏洞，该漏洞源于当带有 URL 片段的请求发送到 Traefik 时，Traefik 会自动对片段进行 URL 编码并将片段转发到后端服务器，这违反了 RFC 7230，URL 应该只包含绝对路径和查询。

CVSS 4.8 · Medium EPSS 0.62% · P48
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I. Basic Information for CVE-2023-47106

Vulnerability Information
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Vulnerability Title
Incorrect processing of fragment in the URL leads to Authorization Bypass in Traefik
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Containous Traefik 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Containous Traefik是美国Containous公司的一款反向代理和负载平衡器。 Traefik v2.10.5及之前、 v3.0.0-beta4及之前版本存在输入验证错误漏洞，该漏洞源于当带有 URL 片段的请求发送到 Traefik 时，Traefik 会自动对片段进行 URL 编码并将片段转发到后端服务器，这违反了 RFC 7230，URL 应该只包含绝对路径和查询。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik < 2.10.6 -

II. Public POCs for CVE-2023-47106

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III. Intelligence Information for CVE-2023-47106

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Vendor Advisories for CVE-2023-47106 (1)

Other References for CVE-2023-47106 (3)

Same Patch Batch · traefik · 2023-12-04 · 3 CVEs total

CVE-2023-47633 7.5 HIGH Uncontrolled Resource Consumption in Traefik
CVE-2023-47124 5.9 MEDIUM Denial of service whith ACME HTTPChallenge in Traefik

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-20

V. Comments for CVE-2023-47106

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