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Improper Control of Resources Affecting github.com/traefik/traefik/v2/pkg/middlewares/headers package, versions <2.4.13

0.0
low

Snyk CVSS

    Attack Complexity High

    Threat Intelligence

    EPSS 0.25% (65th percentile)
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NVD
8.1 high

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  • Snyk ID SNYK-GOLANG-GITHUBCOMTRAEFIKTRAEFIKV2PKGMIDDLEWARESHEADERS-1536534
  • published 4 Aug 2021
  • disclosed 4 Aug 2021
  • credit Unknown
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Introduced: 4 Aug 2021

CVE-2021-32813 Open this link in a new tab
CWE-913 Open this link in a new tab

How to fix?

Upgrade github.com/traefik/traefik/v2/pkg/middlewares/headers to version 2.4.13 or higher.

Overview

github.com/traefik/traefik/v2/pkg/middlewares/headers is a Cloud Native Application Proxy.

Affected versions of this package are vulnerable to Improper Control of Resources via the handling of the Connection header. If an attacker 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.

Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation.