CVSS 3.1
2.5 lowCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NCVE-2020-8912
Low (2.5) in amazon aws s3 crypto sdk. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/aws/aws-sdk-go 1.34.0.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-31)
- CWE
- CWE-327
- Published
- Modified
- Record from
- the NVD, synced
Affected
- amazon:aws_s3_crypto_sdk
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-7f33-f4f5-xwgw | Go | github.com/aws/aws-sdk-go | <1.34.0 | 1.34.0 |
| GO-2022-0635 | Go | github.com/aws/aws-sdk-go | all versions | no fix published |
References
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09
- https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09
- https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw