FKIE_CVE-2017-3204

Vulnerability from fkie_nvd - Published: 2017-04-04 14:59 - Updated: 2026-06-17 01:17
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.
References
cret@cert.orghttp://www.securityfocus.com/bid/97481Third Party Advisory, VDB Entry
cret@cert.orghttps://bridge.grumpy-troll.org/2017/04/golang-ssh-security/Third Party Advisory
cret@cert.orghttps://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991Patch, Third Party Advisory
cret@cert.orghttps://github.com/golang/go/issues/19767Third Party Advisory
cret@cert.orghttps://godoc.org/golang.org/x/crypto/sshVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/97481Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/golang/go/issues/19767Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://godoc.org/golang.org/x/crypto/sshVendor Advisory
Impacted products
Vendor Product Version
golang crypto *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "SSH library",
          "vendor": "Go",
          "versions": [
            {
              "status": "affected",
              "version": "prior to commit e4e2799"
            }
          ]
        }
      ],
      "source": "cret@cert.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:golang:crypto:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4C978A0F-3C80-4898-B1B3-DFF7F97D22DF",
              "versionEndIncluding": "2017-03-17",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism."
    },
    {
      "lang": "es",
      "value": "La librer\u00eda Go SSH (x/crypto/ssh) por defecto no verifica las claves del host, facilitando ataques man-in-the-middle. El comportamiento predeterminado cambi\u00f3 en commit e4e2799 para requerir el registro expl\u00edcito de un mecanismo de verificaci\u00f3n de hostkey."
    }
  ],
  "id": "CVE-2017-3204",
  "lastModified": "2026-06-17T01:17:43.813",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.8,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2017-04-04T14:59:00.180",
  "references": [
    {
      "source": "cret@cert.org",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://www.securityfocus.com/bid/97481"
    },
    {
      "source": "cret@cert.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/"
    },
    {
      "source": "cret@cert.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991"
    },
    {
      "source": "cret@cert.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/golang/go/issues/19767"
    },
    {
      "source": "cret@cert.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://godoc.org/golang.org/x/crypto/ssh"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://www.securityfocus.com/bid/97481"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/golang/go/issues/19767"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://godoc.org/golang.org/x/crypto/ssh"
    }
  ],
  "sourceIdentifier": "cret@cert.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-310"
        }
      ],
      "source": "cret@cert.org",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.