Improper Control of Resources Affecting package, versions <2.4.13



    Attack Complexity High

    Threat Intelligence

    EPSS 0.21% (59th percentile)
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8.1 high

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  • published 4 Aug 2021
  • disclosed 4 Aug 2021
  • credit Unknown

How to fix?

Upgrade to version 2.4.13 or higher.

Overview 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.