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CVE-2020-8912

2.5 · LOW

A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2.

Published Aug 11, 2020CWE-327EPSS 0.23%

Overview

CVE-2020-8912 is a low-severity vulnerability. It was published on August 11, 2020 and has a CVSS 3.1 base score of 2.5 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09GitHubgithub.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgwRefaws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09GitHubgithub.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw

How CyberStrike helps

Frequently asked questions

What is CVE-2020-8912?

CVE-2020-8912 is a low-severity vulnerability. It was published on August 11, 2020 and has a CVSS 3.1 base score of 2.5 (LOW).

How severe is CVE-2020-8912?

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2020-8912?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-8912?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-8912 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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