2021-32813 | Traefik Connection Header dynamically-managed code resources
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A vulnerability, which was classified as critical, has been found in Traefik up to 2.4.12. Affected by this issue is some unknown functionality of the component Connection Header Handler. Using CWE to declare the problem leads to CWE-913. Impacted is confidentiality, integrity, and availability. CVE summarizes:
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.
The weakness was released 08/04/2021. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2021-32813 since 05/12/2021. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.
Upgrading to version 2.4.13 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4
Status: Not defined
0-Day Time: 🔒
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