fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is `/pub/`, a user expect that accessing `/priv` on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.3.1. Reference: https://github.com/fastify/fastify-http-proxy/security/advisories/GHSA-c4qr-gmr9-v23w Upstream patch: https://github.com/fastify/fastify-http-proxy/commit/02d9b43c770aa16bc44470edecfaeb7c17985016
Statement: The impact of this flaw largely depends on the environment where the affected library is being used. This flaw could be used to redirect an adversary to an exposed, unprotected endpoint. Depending on the functionality of the affected endpoint that could result in a loss of confidentiality, integrity and availability. The severity of this flaw in for Red Had Advanced Cluster Management for Kubernetes is rated as important as there are no exposed, un-authenticated endpoints that could be accessed by exploiting this flaw.
External References: https://github.com/fastify/fastify-http-proxy/security/advisories/GHSA-c4qr-gmr9-v23w
This issue has been addressed in the following products: Red Hat Advanced Cluster Management for Kubernetes 2.2 for RHEL 8 Red Hat Advanced Cluster Management for Kubernetes 2.2 for RHEL 7 Via RHSA-2021:1168 https://access.redhat.com/errata/RHSA-2021:1168
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-21322
This issue has been addressed in the following products: Red Hat Advanced Cluster Management for Kubernetes 2.3 for RHEL 7 Red Hat Advanced Cluster Management for Kubernetes 2.3 for RHEL 8 Via RHSA-2021:3016 https://access.redhat.com/errata/RHSA-2021:3016