GHSA-4V7X-PQXF-CX7M

Vulnerability from github – Published: 2024-04-04 21:30 – Updated: 2025-11-04 22:15
VLAI
Summary
net/http, x/net/http2: close connections when receiving too many headers
Details

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "net/http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.21.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "golang.org/x/net/http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "net/http"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.22.0-0"
            },
            {
              "fixed": "1.22.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "golang.org/x/net"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-45288"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-04-04T23:02:57Z",
    "nvd_published_at": "2024-04-04T21:15:16Z",
    "severity": "MODERATE"
  },
  "details": "An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request\u0027s headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.",
  "id": "GHSA-4v7x-pqxf-cx7m",
  "modified": "2025-11-04T22:15:09Z",
  "published": "2024-04-04T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-45288"
    },
    {
      "type": "WEB",
      "url": "https://go.dev/cl/576155"
    },
    {
      "type": "WEB",
      "url": "https://go.dev/issue/65051"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT"
    },
    {
      "type": "WEB",
      "url": "https://nowotarski.info/http2-continuation-flood-technical-details"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2024-2687"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240419-0009"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/421644"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/04/03/16"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/04/05/4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net/http, x/net/http2: close connections when receiving too many headers"
}



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