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.
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 |
| 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
History
21 Nov 2024, 05:39
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 - Vendor Advisory | |
| References | () https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw - Exploit, Third Party Advisory |
Information
Published : 2020-08-11 20:15
Updated : 2024-11-21 05:39
NVD link : CVE-2020-8912
Mitre link : CVE-2020-8912
CVE.ORG link : CVE-2020-8912
JSON object : View
Products Affected
amazon
- aws_s3_crypto_sdk
CWE
CWE-327
Use of a Broken or Risky Cryptographic Algorithm