CVE Vulnerability

CVE-2020-8912

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.

2.1 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

2.5 /10

CVSS v3.0 : LOW

V3 Legend

Vector :

Exploitability : 1 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 Vendor Advisory
https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:*
Information

Published : 2020-08-11 08:15

Updated : 2020-08-17 07:31

NVD link : CVE-2020-8912

Mitre link : CVE-2020-8912

Products Affected
No products.
CWE
CWE-327