{
  "schema_version": "1.3.1",
  "id": "GO-2021-0356",
  "modified": "0001-01-01T00:00:00Z",
  "published": "2022-04-25T20:38:40Z",
  "aliases": [
    "CVE-2022-27191",
    "GHSA-8c26-wmh5-6g9v"
  ],
  "summary": "Denial of service via crafted Signer in golang.org/x/crypto/ssh",
  "details": "Attackers can cause a crash in SSH servers when the server has been configured by passing a Signer to ServerConfig.AddHostKey such that\n1) the Signer passed to AddHostKey does not implement AlgorithmSigner, and\n2) the Signer passed to AddHostKey returns a key of type “ssh-rsa” from its PublicKey method.\n\nServers that only use Signer implementations provided by the ssh package are unaffected.",
  "affected": [
    {
      "package": {
        "name": "golang.org/x/crypto",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20220314234659-1baeb1ce4c0b"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "golang.org/x/crypto/ssh",
            "symbols": [
              "ServerConfig.AddHostKey"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "FIX",
      "url": "https://go.dev/cl/392355"
    },
    {
      "type": "FIX",
      "url": "https://go.googlesource.com/crypto/+/1baeb1ce4c0b006eff0f294c47cb7617598dfb3d"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/-cp44ypCT5s"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2021-0356"
  }
}