gsd-2020-8912
Vulnerability from gsd
Modified
2023-12-13 01:21
Details
A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.
Aliases
Aliases
CVE-2020-8912


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-8912",
    "description": "A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
    "id": "GSD-2020-8912",
    "references": [
      "https://access.redhat.com/errata/RHSA-2021:3851"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-8912"
      ],
      "details": "A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
      "id": "GSD-2020-8912",
      "modified": "2023-12-13T01:21:53.614003Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "security@google.com",
        "ID": "CVE-2020-8912",
        "STATE": "PUBLIC",
        "TITLE": "In-band key negotiation issue 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"
        }
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            "value": "A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. 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": 2.5,
          "baseSeverity": "LOW",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        }
      },
      "problemtype": {
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            "description": [
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                "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",
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          },
          {
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            "url": "https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw"
          }
        ]
      },
      "source": {
        "discovery": "EXTERNAL"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c1.34.0",
          "affected_versions": "All versions before 1.34.0",
          "cvss_v2": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
          "cvss_v3": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "cwe_ids": [
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            "CWE-327",
            "CWE-707",
            "CWE-937"
          ],
          "date": "2023-02-14",
          "description": "A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
          "fixed_versions": [
            "1.34.0"
          ],
          "identifier": "CVE-2020-8912",
          "identifiers": [
            "GHSA-7f33-f4f5-xwgw",
            "CVE-2020-8912"
          ],
          "not_impacted": "All versions starting from 1.34.0",
          "package_slug": "go/github.com/aws/aws-sdk-go",
          "pubdate": "2022-02-11",
          "solution": "Upgrade to version 1.34.0 or above.",
          "title": "Use of a Broken or Risky Cryptographic Algorithm",
          "urls": [
            "https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw",
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8912",
            "https://github.com/aws/aws-sdk-go/pull/3403",
            "https://github.com/aws/aws-sdk-go/commit/1e84382fa1c0086362b5a4b68e068d4f8518d40e",
            "https://github.com/aws/aws-sdk-go/commit/ae9b9fd92af132cfd8d879809d8611825ba135f4",
            "https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09",
            "https://bugzilla.redhat.com/show_bug.cgi?id=1869801",
            "https://github.com/sophieschmieg/exploits/tree/master/aws_s3_crypto_poc",
            "https://pkg.go.dev/vuln/GO-2022-0646",
            "https://github.com/advisories/GHSA-7f33-f4f5-xwgw"
          ],
          "uuid": "aff8c8fa-5dbc-48d9-92e8-2989813450e8"
        },
        {
          "affected_range": "\u003c1.34.0",
          "affected_versions": "All versions before 1.34.0",
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          "cwe_ids": [
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            "CWE-707",
            "CWE-937"
          ],
          "date": "2022-02-11",
          "description": "A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.",
          "fixed_versions": [
            "1.34.0"
          ],
          "identifier": "CVE-2020-8912",
          "identifiers": [
            "GHSA-7f33-f4f5-xwgw",
            "CVE-2020-8912"
          ],
          "not_impacted": "All versions starting from 1.34.0",
          "package_slug": "go/github.com/aws/aws-sdk-go/service/s3/s3crypto",
          "pubdate": "2022-02-11",
          "solution": "Upgrade to version 1.34.0 or above.",
          "title": "Use of a Broken or Risky Cryptographic Algorithm",
          "urls": [
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            "https://nvd.nist.gov/vuln/detail/CVE-2020-8912",
            "https://github.com/aws/aws-sdk-go/pull/3403",
            "https://github.com/aws/aws-sdk-go/commit/1e84382fa1c0086362b5a4b68e068d4f8518d40e",
            "https://github.com/aws/aws-sdk-go/commit/ae9b9fd92af132cfd8d879809d8611825ba135f4",
            "https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09",
            "https://bugzilla.redhat.com/show_bug.cgi?id=1869801",
            "https://github.com/sophieschmieg/exploits/tree/master/aws_s3_crypto_poc",
            "https://github.com/advisories/GHSA-7f33-f4f5-xwgw"
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          "uuid": "0f090656-2ab3-4759-bdc6-a26c35f9affe"
        }
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          ]
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      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 2.1,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
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          "exploitabilityScore": 1.0,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2020-08-17T19:31Z",
      "publishedDate": "2020-08-11T20:15Z"
    }
  }
}


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