Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Amazon | Aws S3 Crypto Sdk | < 2.0 |
Related Weaknesses (CWE)
References
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-clienVendor Advisory
- https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xExploitThird Party Advisory
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-clienVendor Advisory
- https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xExploitThird Party Advisory
FAQ
What is CVE-2020-8912?
CVE-2020-8912 is a vulnerability with a CVSS score of 2.5 (LOW). 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...
How severe is CVE-2020-8912?
CVE-2020-8912 has been rated LOW with a CVSS base score of 2.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-8912?
Check the references section above for vendor advisories and patch information. Affected products include: Amazon Aws S3 Crypto Sdk.