Improper Authentication in Capsule Proxy

HOCH 8.8CVE-2022-23652 · GHSA-9cwv-cppx-mqjm · GO-2022-0329 · Published 22/02/2022 · updated 17/06/2026

Package	Affected versions	Patched versions
github.com/clastix/capsule-proxy Go	`< 0.2.1`	`0.2.1`
capsule-proxy clastix	`< 0.2.1`	`0.2.1`

Description

Impact

Using a malicious Connection header, an attacker with a proper authentication mechanism could start a privilege escalation towards the Kubernetes API Server, being able to exploit the cluster-admin Role bound to capsule-proxy.

Patches

Patch has been merged in the v0.2.1 release.

Workarounds

Upgrading is mandatory.

NVD description

capsule-proxy is a reverse proxy for Capsule Operator which provides multi-tenancy in Kubernetes. In versions prior to 0.2.1 an attacker with a proper authentication mechanism may use a malicious `Connection` header to start a privilege escalation attack towards the Kubernetes API Server. This vulnerability allows for an exploit of the `cluster-admin` Role bound to `capsule-proxy`. There are no known workarounds for this issue.

References

clastix/capsule-proxy security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2022-23652 · ADVISORY
clastix/capsule-proxy · WEB
clastix/capsule-proxy commit efe91f6 · WEB
clastix/capsule-proxy · WEB

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