CVE-2023-30851: Github.com/cilium/cilium Potential HTTP Policy Bypass When Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2h44-x2wx-49f4",
  "modified" : "2023-06-02T23:57:03Z",
  "published" : "2023-05-22T20:33:15Z",
  "aliases" : [ "CVE-2023-30851" ],
  "summary" : "Potential HTTP policy bypass when using header rules in Cilium",
  "details" : "### Impact\n\nThis issue only impacts users who:\n\n- Have a HTTP policy that applies to multiple `toEndpoints` AND\n- Have an allow-all rule in place that affects only one of those endpoints\n\nIn such cases, a wildcard rule will be appended to the set of HTTP rules, which could cause bypass of HTTP policies.\n\n### Patches\n\nThis issue has been patched in Cilium 1.11.16, 1.12.9, and 1.13.2.\n\n### Workarounds\n\nRewrite HTTP rules for each endpoint separately. For example, if the initial rule looks like:\n\n```\n  egress:\n    - toEndpoints:\n        - matchLabels:\n            k8s:kind: echo\n        - matchLabels:\n            k8s:kind: example\n      toPorts:\n        - ports:\n            - port: \"8080\"\n              protocol: TCP\n          rules:\n            http:\n              - method: \"GET\"\n```\n\nIt should be rewritten to:\n \n```\n  egress:\n    - toEndpoints:\n        - matchLabels:\n            k8s:kind: echo\n      toPorts:\n        - ports:\n            - port: \"8080\"\n              protocol: TCP\n          rules:\n            http:\n              - method: \"GET\"\n    - toEndpoints:\n        - matchLabels:\n            k8s:kind: example\n      toPorts:\n        - ports:\n            - port: \"8080\"\n              protocol: TCP\n          rules:\n            http:\n              - method: \"GET\"\n```     \n\n### Acknowledgements\n\nThe Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @jrajahalme for investigating and fixing the issue.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack).\n\nAs usual, if you think you found a related vulnerability, we strongly encourage you to report security vulnerabilities to our private security mailing list: [security@cilium.io](mailto:security@cilium.io) - first, before disclosing them in any public forums. This is a private mailing list where only members of the Cilium internal security team are subscribed to, and is treated as top priority.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cilium/cilium"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.11.16"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cilium/cilium"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.12.0"
      }, {
        "fixed" : "1.12.9"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cilium/cilium"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.13.0"
      }, {
        "fixed" : "1.13.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cilium/cilium/security/advisories/GHSA-2h44-x2wx-49f4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-30851"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cilium/cilium"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cilium/cilium/releases/tag/v1.11.16"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cilium/cilium/releases/tag/v1.12.9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cilium/cilium/releases/tag/v1.13.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-05-22T20:33:15Z",
    "nvd_published_at" : "2023-05-25T18:15:10Z"
  }
}