CVE-2020-8912

LowCVSS 2.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 2.5/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-327

Affected software

No affected versions have been published.

Timeline

Published: Aug 11, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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