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GoogleCVE-2020-8911

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

CVE-2020-8911

2020-08-1120:15:13

CWE-327

Google

web.nvd.nist.gov

131

aws

crypto

sdk

golang

vulnerability

aws s3 crypto sdk

padding oracle

cve-2020-8911

encryption

aes-cbc

mac

pkcs5 padding error

CVSS2

2.1

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

CVSS3

5.6

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

5.4

Confidence

High

EPSS

0.001

Percentile

20.2%

JSON

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’s 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’s 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.

Affected configurations

Nvd

Node

amazonaws_s3_crypto_sdkRange<2.0golang

VendorProductVersionCPE
amazonaws_s3_crypto_sdk*cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:*

Vendor	Product	Version	CPE
amazon	aws_s3_crypto_sdk	*	cpe:2.3:a:amazon:aws_s3_crypto_sdk::::::golang::*

CNA Affected

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