GSD-2020-8918

Vulnerability from gsd - Updated: 2023-12-13 01:21
Details
An improperly initialized 'migrationAuth' value in Google's go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both 'encUsageAuth' and 'encMigrationAuth', and then can calculate 'usageAuth ^ encMigrationAuth' as the 'migrationAuth' can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for 'migrationAuth'.
Aliases
Aliases
CVE-2020-8918
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{
  "GSD": {
    "alias": "CVE-2020-8918",
    "description": "An improperly initialized \u0027migrationAuth\u0027 value in Google\u0027s go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both \u0027encUsageAuth\u0027 and \u0027encMigrationAuth\u0027, and then can calculate \u0027usageAuth ^ encMigrationAuth\u0027 as the \u0027migrationAuth\u0027 can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for \u0027migrationAuth\u0027.",
    "id": "GSD-2020-8918"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-8918"
      ],
      "details": "An improperly initialized \u0027migrationAuth\u0027 value in Google\u0027s go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both \u0027encUsageAuth\u0027 and \u0027encMigrationAuth\u0027, and then can calculate \u0027usageAuth ^ encMigrationAuth\u0027 as the \u0027migrationAuth\u0027 can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for \u0027migrationAuth\u0027.",
      "id": "GSD-2020-8918",
      "modified": "2023-12-13T01:21:54.320659Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@google.com",
        "ID": "CVE-2020-8918",
        "STATE": "PUBLIC",
        "TITLE": "TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "google/go-tpm library",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "stable",
                          "version_value": "0.3.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Google LLC"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Chris Fenner"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "An improperly initialized \u0027migrationAuth\u0027 value in Google\u0027s go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both \u0027encUsageAuth\u0027 and \u0027encMigrationAuth\u0027, and then can calculate \u0027usageAuth ^ encMigrationAuth\u0027 as the \u0027migrationAuth\u0027 can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for \u0027migrationAuth\u0027."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-665 Improper Initialization"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw",
            "refsource": "CONFIRM",
            "url": "https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw"
          }
        ]
      },
      "source": {
        "discovery": "INTERNAL"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003cv0.3.0",
          "affected_versions": "All versions before 0.3.0",
          "cvss_v2": "AV:L/AC:L/Au:N/C:P/I:P/A:N",
          "cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-665",
            "CWE-937"
          ],
          "date": "2020-08-18",
          "description": "An improperly initialized `migrationAuth\u0027 value in Google\u0027s go-tpm library can lead an eavesdropping attacker to discover the `auth` value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both `encUsageAuth` and `encMigrationAuth`, and then can calculate `usageAuth ^ encMigrationAuth` as the `migrationAuth` can be guessed for all keys created with `CreateWrapKey`.",
          "fixed_versions": [
            "v0.3.0"
          ],
          "identifier": "CVE-2020-8918",
          "identifiers": [
            "CVE-2020-8918",
            "GHSA-5x29-3hr9-6wpw"
          ],
          "not_impacted": "All versions starting from 0.3.0",
          "package_slug": "go/github.com/google/go-tpm",
          "pubdate": "2020-08-11",
          "solution": "Upgrade to version 0.3.0 or above.",
          "title": "Improper Initialization",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8918"
          ],
          "uuid": "63158d1b-4d22-40b5-afc6-f9dfe9a615e9",
          "versions": [
            {
              "commit": {
                "sha": "d7806cce857a1a020190c03348e5361725d8f141",
                "tags": [
                  "v0.3.0"
                ],
                "timestamp": "20200723210223"
              },
              "number": "v0.3.0"
            }
          ]
        },
        {
          "affected_range": "\u003cv0.2.0",
          "affected_versions": "All versions before 0.2.0",
          "cvss_v2": "AV:L/AC:L/Au:N/C:P/I:P/A:N",
          "cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-665",
            "CWE-937"
          ],
          "date": "2022-02-11",
          "description": "An improperly initialized \u0027migrationAuth\u0027 value in Google\u0027s go-tpm TPM1.2 library can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both \u0027encUsageAuth\u0027 and \u0027encMigrationAuth\u0027, and then can calculate \u0027usageAuth ^ encMigrationAuth\u0027 as the \u0027migrationAuth\u0027 can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to or later, or, if you cannot update, to call CreateWrapKey with a random value for \u0027migrationAuth\u0027.",
          "fixed_versions": [
            "v0.2.0"
          ],
          "identifier": "CVE-2020-8918",
          "identifiers": [
            "GHSA-5x29-3hr9-6wpw",
            "CVE-2020-8918"
          ],
          "not_impacted": "All versions starting from 0.2.0",
          "package_slug": "go/github.com/google/go-tpm/tpm",
          "pubdate": "2022-02-11",
          "solution": "Upgrade to version 0.2.0 or above.",
          "title": "Improper Initialization",
          "urls": [
            "https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw",
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8918",
            "https://github.com/google/go-tpm/pull/195",
            "https://github.com/advisories/GHSA-5x29-3hr9-6wpw"
          ],
          "uuid": "0dcf6dcd-b03c-4b5c-b6f6-c61222190330",
          "versions": [
            {
              "commit": {
                "sha": "b2c8857856f7516bb35d299c6b5d19f64e4ad579",
                "tags": [
                  "v0.2.0"
                ],
                "timestamp": "20190906233705"
              },
              "number": "v0.2.0"
            }
          ]
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:google:go-tpm:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "0.3.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security@google.com",
          "ID": "CVE-2020-8918"
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        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "An improperly initialized \u0027migrationAuth\u0027 value in Google\u0027s go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both \u0027encUsageAuth\u0027 and \u0027encMigrationAuth\u0027, and then can calculate \u0027usageAuth ^ encMigrationAuth\u0027 as the \u0027migrationAuth\u0027 can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for \u0027migrationAuth\u0027."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-665"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw",
              "refsource": "CONFIRM",
              "tags": [
                "Exploit",
                "Third Party Advisory"
              ],
              "url": "https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 3.6,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 4.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 5.2
        }
      },
      "lastModifiedDate": "2020-08-18T13:32Z",
      "publishedDate": "2020-08-11T19:15Z"
    }
  }
}



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