{
  "id": "GO-2021-0226",
  "published": "2022-01-13T03:44:58Z",
  "modified": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2020-24553"
  ],
  "details": "When a Handler does not explicitly set the Content-Type header, the the package would default to “text/html”, which could cause a Cross-Site Scripting vulnerability if an attacker can control any part of the contents of a response.\n\nThe Content-Type header is now set based on the contents of the first Write using http.DetectContentType, which is consistent with the behavior of the net/http package.\n\nAlthough this protects some applications that validate the contents of uploaded files, not setting the Content-Type header explicitly on any attacker-controlled file is unsafe and should be avoided.",
  "affected": [
    {
      "package": {
        "name": "stdlib",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.14.8"
            },
            {
              "introduced": "1.15.0"
            },
            {
              "fixed": "1.15.1"
            }
          ]
        }
      ],
      "database_specific": {
        "url": "https://pkg.go.dev/vuln/GO-2021-0226"
      },
      "ecosystem_specific": {
        "imports": [
          {
            "path": "net/http/cgi",
            "symbols": [
              "response.Write",
              "response.WriteHeader",
              "response.writeCGIHeader"
            ]
          },
          {
            "path": "net/http/fcgi",
            "symbols": [
              "response.Write",
              "response.WriteHeader",
              "response.writeCGIHeader"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "FIX",
      "url": "https://go.dev/cl/252179"
    },
    {
      "type": "FIX",
      "url": "https://go.googlesource.com/go/+/4f5cd0c0331943c7ec72df3b827d972584f77833"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/8wqlSbkLdPs"
    },
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/40928"
    }
  ],
  "credits": [
    {
      "name": "RedTeam Pentesting GmbH"
    }
  ],
  "schema_version": "1.3.1"
}