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{"acknowledgement": "Red Hat would like to thank the Kubernetes Product Security Committee for reporting this issue. Upstream acknowledges Etienne Champetier (Anevia) as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:0079", "cpe": "cpe:/a:redhat:openshift:3.11::el7", "package": "atomic-openshift-0:3.11.374-1.git.0.ebd3ee9.el7", "product_name": "Red Hat OpenShift Container Platform 3.11", "release_date": "2021-01-20T00:00:00Z"}], "bugzilla": {"description": "kubernetes: MITM using LoadBalancer or ExternalIPs", "id": "1891051", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1891051"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "status": "verified"}, "cwe": "CWE-200", "details": ["Kubernetes API server in all versions allow an attacker who is able to create a ClusterIP service and set the spec.externalIPs field, to intercept traffic to that IP address. Additionally, an attacker who is able to patch the status (which is considered a privileged operation and should not typically be granted to users) of a LoadBalancer service can set the status.loadBalancer.ingress.ip to similar effect.", "A flaw was found in kubernetes. If a potential attacker can already create or edit services and pods, then they may be able to intercept traffic from other pods (or nodes) in the cluster."], "mitigation": {"lang": "en:us", "value": "ExternalIP addresses ranges can be configured as described below. OCP 4 is secure by default, though cluster-admins can whitelist externalIP addresses as needed. OCP 3.11 can be secured by changing `externalIPNetworkCIDR` to \"0.0.0.0/32\", which blocks all externalIP address values.\nhttps://docs.openshift.com/container-platform/4.6/networking/configuring_ingress_cluster_traffic/configuring-externalip.html\nhttps://docs.openshift.com/container-platform/3.11/admin_guide/tcp_ingress_external_ports.html#service-externalip\nUsers can check if they have permission to patch the Status of a LoadBalancer Service with the command: `kubectl auth can-i patch service --subresource=status`. In OCP, by default only cluster-admins are granted this permission."}, "name": "CVE-2020-8554", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:storage:3", "fix_state": "Not affected", "package_name": "heketi", "product_name": "Red Hat Storage 3"}], "public_date": "2020-12-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-8554\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-8554\nhttps://blog.champtar.fr/K8S_MITM_LoadBalancer_ExternalIPs/\nhttps://groups.google.com/g/kubernetes-security-announce/c/iZWsF9nbKE8"], "statement": "OpenShift Container Platform (OCP) includes a builtin externalIP admission plugin, which restricts the use of Service eternalIPs to those configured by a cluster-admin. In OCP4 all externalIP ranges are disabled by default. In OCP 3.11, the default range is \"0.0.0.0/0\", which allows all IP addresses.\nThe second attack vector, via patching the Status of a LoadBalancer Service, is not possible unless permission to patch service/status is granted. OCP does not grant this permission to users who are not cluster-admins.\nOCP 4 is not affected by this vulnerability as it is secure by default. OCP 3.11 is affected, however the vulnerability can be by mitigated by configuring the builtin externalIP admission plugin.", "threat_severity": "Moderate"}