ghsa-hvwr-mw2m-chj3
Vulnerability from github
Published
2022-05-24 17:14
Modified
2022-05-24 17:14
Details

Istio through 1.5.1 and Envoy through 1.14.1 have a data-leak issue. If there is a TCP connection (negotiated with SNI over HTTPS) to .example.com, a request for a domain concurrently configured explicitly (e.g., abc.example.com) is sent to the server(s) listening behind .example.com. The outcome should instead be 421 Misdirected Request. Imagine a shared caching forward proxy re-using an HTTP/2 connection for a large subnet with many users. If a victim is interacting with abc.example.com, and a server (for abc.example.com) recycles the TCP connection to the forward proxy, the victim's browser may suddenly start sending sensitive data to a *.example.com server. This occurs because the forward proxy between the victim and the origin server reuses connections (which obeys the specification), but neither Istio nor Envoy corrects this by sending a 421 error. Similarly, this behavior voids the security model browsers have put in place between domains.

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{
  "affected": [],
  "aliases": [
    "CVE-2020-11767"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-04-15T02:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Istio through 1.5.1 and Envoy through 1.14.1 have a data-leak issue. If there is a TCP connection (negotiated with SNI over HTTPS) to *.example.com, a request for a domain concurrently configured explicitly (e.g., abc.example.com) is sent to the server(s) listening behind *.example.com. The outcome should instead be 421 Misdirected Request. Imagine a shared caching forward proxy re-using an HTTP/2 connection for a large subnet with many users. If a victim is interacting with abc.example.com, and a server (for abc.example.com) recycles the TCP connection to the forward proxy, the victim\u0027s browser may suddenly start sending sensitive data to a *.example.com server. This occurs because the forward proxy between the victim and the origin server reuses connections (which obeys the specification), but neither Istio nor Envoy corrects this by sending a 421 error. Similarly, this behavior voids the security model browsers have put in place between domains.",
  "id": "GHSA-hvwr-mw2m-chj3",
  "modified": "2022-05-24T17:14:43Z",
  "published": "2022-05-24T17:14:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11767"
    },
    {
      "type": "WEB",
      "url": "https://github.com/envoyproxy/envoy/issues/6767"
    },
    {
      "type": "WEB",
      "url": "https://github.com/istio/istio/issues/13589"
    },
    {
      "type": "WEB",
      "url": "https://github.com/istio/istio/issues/9429"
    },
    {
      "type": "WEB",
      "url": "https://bugs.chromium.org/p/chromium/issues/detail?id=954160#c5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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