{
  "GSD": {
    "alias": "CVE-2021-25736",
    "id": "GSD-2021-25736",
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              "value": "\u003cp\u003eThis issue has been fixed in the following versions:\u003cu\u003e\u003c/u\u003e\u003cu\u003e\u003c/u\u003e\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\nv1.21.0\u003cu\u003e\u003c/u\u003e\u003cu\u003e\u003c/u\u003e\u003c/li\u003e\u003cli\u003e\nv1.20.6\u003cu\u003e\u003c/u\u003e\u003cu\u003e\u003c/u\u003e\u003c/li\u003e\u003cli\u003e\nv1.19.10\u003cu\u003e\u003c/u\u003e\u003cu\u003e\u003c/u\u003e\u003c/li\u003e\u003cli\u003e\nv1.18.18\u003c/li\u003e\u003c/ul\u003e"
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      "cve": {
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        "descriptions": [
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            "lang": "en",
            "value": "Kube-proxy\n on Windows can unintentionally forward traffic to local processes \nlistening on the same port (\u201cspec.ports[*].port\u201d) as a LoadBalancer \nService when the LoadBalancer controller\n does not set the \u201cstatus.loadBalancer.ingress[].ip\u201d field. Clusters \nwhere the LoadBalancer controller sets the \n\u201cstatus.loadBalancer.ingress[].ip\u201d field are unaffected.\n\n"
          },
          {
            "lang": "es",
            "value": "Kube-proxy en Windows puede reenviar tr\u00e1fico involuntariamente a procesos locales que escuchan en el mismo puerto (\u201cspec.ports[*].port\u201d) que LoadBalancer Service cuando el controlador LoadBalancer no configura \u201cstatus.loadBalancer.ingress[].ip\u201d. Los cl\u00fasteres donde el controlador LoadBalancer establece el campo \"status.loadBalancer.ingress[].ip\" no se ven afectados."
          }
        ],
        "id": "CVE-2021-25736",
        "lastModified": "2023-12-21T22:15:07.533",
        "metrics": {
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              "cvssData": {
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              "type": "Primary"
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              "exploitabilityScore": 1.3,
              "impactScore": 4.0,
              "source": "jordan@liggitt.net",
              "type": "Secondary"
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            "source": "jordan@liggitt.net",
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{
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    {
      "package": {
        "ecosystem": "Go",
        "name": "k8s.io/kubernetes"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-25736"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2023-10-31T22:23:04Z",
    "nvd_published_at": "2023-10-30T03:15:07Z",
    "severity": "MODERATE"
  },
  "details": "Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (`spec.ports[*].port`) as a LoadBalancer Service when the LoadBalancer controller does not set the `status.loadBalancer.ingress[].ip` field. Clusters \nwhere the LoadBalancer controller sets the `status.loadBalancer.ingress[].ip` field are unaffected.\n\n",
  "id": "GHSA-35c7-w35f-xwgh",
  "modified": "2023-10-31T22:23:04Z",
  "published": "2023-10-30T03:30:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25736"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubernetes/kubernetes/pull/99958"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubernetes/kubernetes/commit/b014610de3e5cf1bb0f7844b5758d29fc18b75e6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kubernetes/kubernetes"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Kube-proxy may unintentionally forward traffic"
}

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      "text": "Moderate"
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        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Windows Container Support for Red Hat OpenShift allows you to deploy Windows container workloads running on Windows Server containers.\n\nSecurity Fix(es):\n\n* kubernetes: LoadBalancer Service type don\u0027t create a HNS policy for empty or invalid external loadbalancer IP, what could lead to MITM (CVE-2021-25736)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* WMCO patch pub-key-hash annotation to Linux node (BZ#1945248)\n\n* LoadBalancer Service type with invalid external loadbalancer IP breaks the datapath (BZ#1952917)\n\n* Telemetry info not completely available to identify windows nodes (BZ#1955319)\n\n* WMCO incorrectly shows node as ready after a failed configuration (BZ#1956412)\n\n* kube-proxy service terminated unexpectedly after recreated LB service (BZ#1963263)",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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      },
      "discovery_date": "2021-04-06T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1946538"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Windows kube-proxy component. In a cloud environment that does not set the \u201c.status.loadBalancer.ingress.ip\u201d field in the LoadBalancer service status configuration (for example in AWS) the packets can be misrouted and reach an unintended destination.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kubernetes: LoadBalancer Service type don\u0027t create a HNS policy for empty or invalid external loadbalancer IP, what could lead to MITM",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Clusters where the LoadBalancer controller sets the \u201cstatus.loadBalancer.ingress[].ip\u201d field are unaffected.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-operator-bundle@sha256:60ab0ad722725d13abdede0fa569ee4ad2ec95350584dfd51c016510142f0523_amd64",
          "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-rhel8-operator@sha256:34a7784ef1e4cd3aa4a8c2151006ef56a60c8b30c9a7e25cdb198036de8c27e9_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-25736"
        },
        {
          "category": "external",
          "summary": "RHBZ#1946538",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1946538"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-25736",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-25736"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-25736",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25736"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q",
          "url": "https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q"
        }
      ],
      "release_date": "2021-05-10T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "For Windows Machine Config Operator upgrades, see the following documentation:\n\nhttps://docs.openshift.com/container-platform/4.7/windows_containers/windows-node-upgrades.html",
          "product_ids": [
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-operator-bundle@sha256:60ab0ad722725d13abdede0fa569ee4ad2ec95350584dfd51c016510142f0523_amd64",
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-rhel8-operator@sha256:34a7784ef1e4cd3aa4a8c2151006ef56a60c8b30c9a7e25cdb198036de8c27e9_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:2130"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-operator-bundle@sha256:60ab0ad722725d13abdede0fa569ee4ad2ec95350584dfd51c016510142f0523_amd64",
            "8Base-RHOSE-4.7:openshift4-wincw/windows-machine-config-rhel8-operator@sha256:34a7784ef1e4cd3aa4a8c2151006ef56a60c8b30c9a7e25cdb198036de8c27e9_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kubernetes: LoadBalancer Service type don\u0027t create a HNS policy for empty or invalid external loadbalancer IP, what could lead to MITM"
    }
  ]
}