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[email protected]CVE-2020-8912

HistoryAug 11, 2020 - 8:15 p.m.

CVE-2020-8912

2020-08-1120:15:13

CWE-327

[email protected]

web.nvd.nist.gov

144

aws

crypto

sdk

golang

vulnerability

encryption

algorithm

authentication

key

cve-2020-8912

2.1 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

2.5 Low

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

4.1 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.0%

JSON

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.

Affected configurations

NVD

Node

amazonaws_s3_crypto_sdkRange<2.0golang

CPENameOperatorVersion
amazon:aws_s3_crypto_sdkamazon aws s3 crypto sdklt2.0

CPE	Name	Operator	Version
amazon:aws_s3_crypto_sdk	amazon aws s3 crypto sdk	lt	2.0

CNA Affected

[
  {
    "product": "AWS S3 Crypto SDK for GoLang",
    "vendor": "Google LLC",
    "versions": [
      {
        "lessThanOrEqual": "V1",
        "status": "affected",
        "version": "stable",
        "versionType": "custom"
      }
    ]
  }
]