cve-2020-8911
Vulnerability from cvelistv5
Published
2020-08-11 19:20
Modified
2024-08-04 10:12
Severity ?
5.6 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Summary
CBC padding oracle in AWS S3 Crypto SDK for GoLang
References
cve-coordination@google.comhttps://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09Vendor Advisory
cve-coordination@google.comhttps://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9Exploit, Third Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T10:12:11.063Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "AWS S3 Crypto SDK for GoLang",
          "vendor": "Google LLC",
          "versions": [
            {
              "lessThanOrEqual": "V1",
              "status": "affected",
              "version": "stable",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Sophie Schmieg"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-327",
              "description": "CWE-327 Use of a Broken or Risky Cryptographic Algorithm",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-08-11T19:20:13",
        "orgId": "14ed7db2-1595-443d-9d34-6215bf890778",
        "shortName": "Google"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09"
        },
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "CBC padding oracle in AWS S3 Crypto SDK for GoLang",
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@google.com",
          "ID": "CVE-2020-8911",
          "STATE": "PUBLIC",
          "TITLE": "CBC padding oracle in AWS S3 Crypto SDK for GoLang"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "AWS S3 Crypto SDK for GoLang",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003c=",
                            "version_name": "stable",
                            "version_value": "V1"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Google LLC"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "Sophie Schmieg"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files."
            }
          ]
        },
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "impact": {
          "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-327 Use of a Broken or Risky Cryptographic Algorithm"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09",
              "refsource": "CONFIRM",
              "url": "https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09"
            },
            {
              "name": "https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9",
              "refsource": "CONFIRM",
              "url": "https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9"
            }
          ]
        },
        "source": {
          "discovery": "EXTERNAL"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778",
    "assignerShortName": "Google",
    "cveId": "CVE-2020-8911",
    "datePublished": "2020-08-11T19:20:14",
    "dateReserved": "2020-02-12T00:00:00",
    "dateUpdated": "2024-08-04T10:12:11.063Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-8911\",\"sourceIdentifier\":\"cve-coordination@google.com\",\"published\":\"2020-08-11T20:15:13.230\",\"lastModified\":\"2024-11-21T05:39:40.457\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target\u0027s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC\u0027s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.\"},{\"lang\":\"es\",\"value\":\"Se presenta una vulnerabilidad de tipo padding oracle en AWS S3 Crypto SDK para GoLang versiones anteriores a la versi\u00f3n V2. El SDK permite a los usuarios cifrar archivos con AES-CBC sin calcular un Message Authentication Code (MAC), que entonces permite a un atacante que tiene acceso de escritura al dep\u00f3sito S3 del objetivo y puede observar si un endpoint con acceso a la clave puede descifrar un archivo, pueden reconstruir el texto plano con (en promedio) consultas 128*length (en texto sin formato) al endpoint, aprovechando la capacidad de CBC para manipular los bytes del siguiente bloque y los errores de relleno de PKCS5. Se recomienda actualizar su SDK a la versi\u00f3n V2 o posterior y volver a cifrar sus archivos\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve-coordination@google.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N\",\"baseScore\":5.6,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.1,\"impactScore\":4.0},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N\",\"baseScore\":5.6,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.1,\"impactScore\":4.0}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:L/AC:L/Au:N/C:P/I:N/A:N\",\"baseScore\":2.1,\"accessVector\":\"LOCAL\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"LOW\",\"exploitabilityScore\":3.9,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"cve-coordination@google.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-327\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-327\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:*\",\"versionEndExcluding\":\"2.0\",\"matchCriteriaId\":\"6DA4DBDE-9779-48A4-AE06-E000069FC72F\"}]}]}],\"references\":[{\"url\":\"https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09\",\"source\":\"cve-coordination@google.com\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9\",\"source\":\"cve-coordination@google.com\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.