CVE-2020-8897 Robustness weakness in AWS KMS and Encryption SDKs

2020-11-1611:55:11

CWE-310

Google

www.cve.org

4.8 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

8 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

31.5%

JSON

A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C and Javalcript prior to versions 2.0.0. Due to the non-committing property of AES-GCM (and other AEAD ciphers such as AES-GCM-SIV or (X)ChaCha20Poly1305) used by the SDKs to encrypt messages, an attacker can craft a unique cyphertext which will decrypt to multiple different results, and becomes especially relevant in a multi-recipient setting. We recommend users update their SDK to 2.0.0 or later.

CNA Affected

[
  {
    "platforms": [
      "all"
    ],
    "product": "AWS SDK",
    "vendor": "Amazon",
    "versions": [
      {
        "lessThan": "2.0.0",
        "status": "affected",
        "version": "stable",
        "versionType": "custom"
      }
    ]
  }
]