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CVE-2021-32813— Drop Headers via Malicious Connection Header

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 2.4.13之前版本存在安全漏洞，攻击者可以利用该漏洞提升权限。

CVSS 4.8 · Medium EPSS 1.10% · P63

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2021-32813

Vulnerability Information
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Vulnerability Title
Drop Headers via Malicious Connection Header
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.4.13, there exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse. If one has a chain of Traefik middlewares, and one of them sets a request header, then sending a request with a certain Connection header will cause it to be removed before the request is sent. In this case, the backend does not see the request header. A patch is available in version 2.4.13. There are no known workarounds aside from upgrading.
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
动态管理代码资源的控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Containous Traefik 安全漏洞
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 2.4.13之前版本存在安全漏洞，攻击者可以利用该漏洞提升权限。
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 < 2.4.13 -

II. Public POCs for CVE-2021-32813

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III. Intelligence Information for CVE-2021-32813

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Patches & Fixes for CVE-2021-32813 (1)

Vendor Advisories for CVE-2021-32813 (1)

Other References for CVE-2021-32813 (1)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-913

V. Comments for CVE-2021-32813

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