cve-2016-20012
Vulnerability from cvelistv5
Published
2021-09-15 19:32
Modified
2024-08-06 03:47
Severity
Summary
OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product
References
SourceURLTags
cve@mitre.orghttps://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265Exploit, Third Party Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/pull/270Patch, Third Party Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097Issue Tracking, Third Party Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185Issue Tracking, Third Party Advisory
cve@mitre.orghttps://rushter.com/blog/public-ssh-keys/Exploit, Third Party Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20211014-0005/Third Party Advisory
cve@mitre.orghttps://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeakThird Party Advisory
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2018/08/24/1Mailing List, Third Party Advisory
Impacted products
VendorProduct
n/an/a
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-06T03:47:34.948Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/openssh/openssh-portable/pull/270"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://rushter.com/blog/public-ssh-keys/"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20211014-0005/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://www.openwall.com/lists/oss-security/2018/08/24/1"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-02-22T22:24:33",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openssh/openssh-portable/pull/270"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://rushter.com/blog/public-ssh-keys/"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://security.netapp.com/advisory/ntap-20211014-0005/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.openwall.com/lists/oss-security/2018/08/24/1"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185"
        }
      ],
      "tags": [
        "disputed"
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2016-20012",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "** DISPUTED ** OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/openssh/openssh-portable/pull/270",
              "refsource": "MISC",
              "url": "https://github.com/openssh/openssh-portable/pull/270"
            },
            {
              "name": "https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265",
              "refsource": "MISC",
              "url": "https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265"
            },
            {
              "name": "https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak",
              "refsource": "MISC",
              "url": "https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak"
            },
            {
              "name": "https://rushter.com/blog/public-ssh-keys/",
              "refsource": "MISC",
              "url": "https://rushter.com/blog/public-ssh-keys/"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20211014-0005/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20211014-0005/"
            },
            {
              "name": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097",
              "refsource": "MISC",
              "url": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097"
            },
            {
              "name": "https://www.openwall.com/lists/oss-security/2018/08/24/1",
              "refsource": "MISC",
              "url": "https://www.openwall.com/lists/oss-security/2018/08/24/1"
            },
            {
              "name": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185",
              "refsource": "MISC",
              "url": "https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2016-20012",
    "datePublished": "2021-09-15T19:32:11",
    "dateReserved": "2021-09-15T00:00:00",
    "dateUpdated": "2024-08-06T03:47:34.948Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2016-20012\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2021-09-15T20:15:07.310\",\"lastModified\":\"2024-08-06T04:16:44.247\",\"vulnStatus\":\"Modified\",\"cveTags\":[{\"sourceIdentifier\":\"cve@mitre.org\",\"tags\":[\"disputed\"]}],\"descriptions\":[{\"lang\":\"en\",\"value\":\"OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product\"},{\"lang\":\"es\",\"value\":\"** EN DISPTUTA ** OpenSSH versiones hasta 8.7, permite a atacantes remotos, que presentan la sospecha de que una determinada combinaci\u00f3n de nombre de usuario y clave p\u00fablica es conocida por un servidor SSH, comprobar si esta sospecha es correcta. Esto ocurre porque es enviado un desaf\u00edo s\u00f3lo cuando esa combinaci\u00f3n podr\u00eda ser v\u00e1lida para una sesi\u00f3n de inicio de sesi\u00f3n. NOTA: el proveedor no reconoce la enumeraci\u00f3n de usuarios como una vulnerabilidad para este producto\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:N/A:N\",\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\",\"baseScore\":4.3},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"8.7\",\"matchCriteriaId\":\"2E1A0346-2185-4EE6-AC3A-DE31E6A21AE4\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1FE996B1-6951-4F85-AA58-B99A379D2163\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A3C19813-E823-456A-B1CE-EC0684CE1953\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7CF3019-975D-40BB-A8A4-894E62BD3797\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A6E9EF0C-AFA8-4F7B-9FDC-1E0F7C26E737\"}]}]}],\"references\":[{\"url\":\"https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/openssh/openssh-portable/pull/270\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://rushter.com/blog/public-ssh-keys/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20211014-0005/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.openwall.com/lists/oss-security/2018/08/24/1\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.