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CVE-2020-8912 Details

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.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:2.5 LOWVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CNA: [email protected]CVSS-B:2.5 LOWVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09	CVE	Vendor Advisory
https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw	CVE	ExploitThird Party Advisory
https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09	[email protected]	Vendor Advisory
https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw	[email protected]	ExploitThird Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-327	Use of a Broken or Risky Cryptographic Algorithm	[email protected]
CWE-327	Use of a Broken or Risky Cryptographic Algorithm	[email protected]

Affected Products

Product	Versions
amazon aws s3 crypto sdk	< 2.0
CPE cpe:2.3:a:amazon:aws_s3_crypto_sdk::::::golang::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Aug 17, 2020	Initial Analysis	[email protected]