{
  "threat_severity" : "Moderate",
  "public_date" : "2021-05-10T00:00:00Z",
  "bugzilla" : {
    "description" : "kubernetes: LoadBalancer Service type don't create a HNS policy for empty or invalid external loadbalancer IP, what could lead to MITM",
    "id" : "1946538",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1946538"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.8",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-200",
  "details" : [ "Kube-proxy\non Windows can unintentionally forward traffic to local processes \nlistening on the same port (“spec.ports[*].port”) as a LoadBalancer \nService when the LoadBalancer controller\ndoes not set the “status.loadBalancer.ingress[].ip” field. Clusters \nwhere the LoadBalancer controller sets the \n“status.loadBalancer.ingress[].ip” field are unaffected.", "A flaw was found in the Windows kube-proxy component. In a cloud environment that does not set the “.status.loadBalancer.ingress.ip” field in the LoadBalancer service status configuration (for example in AWS) the packets can be misrouted and reach an unintended destination." ],
  "statement" : "Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.",
  "acknowledgement" : "This issue was discovered by Christian Hernandez (Red Hat) and Eric Paris (Red Hat).",
  "affected_release" : [ {
    "product_name" : "Red Hat OpenShift Container Platform 4.7",
    "release_date" : "2021-06-23T00:00:00Z",
    "advisory" : "RHSA-2021:2130",
    "cpe" : "cpe:/a:redhat:openshift:4.7::el8",
    "package" : "openshift4-wincw/windows-machine-config-operator-bundle:v2.0.1-8"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.7",
    "release_date" : "2021-06-23T00:00:00Z",
    "advisory" : "RHSA-2021:2130",
    "cpe" : "cpe:/a:redhat:openshift:4.7::el8",
    "package" : "openshift4-wincw/windows-machine-config-rhel8-operator:2.0.1-6"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2021-25736\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-25736\nhttps://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q" ],
  "name" : "CVE-2021-25736",
  "csaw" : false
}