CVE-2020-8912

Public Exploit
In-band key negotiation issue in AWS S3 Crypto SDK for GoLang

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.

Category

2.5
CVSS
Severity: Low
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.14%
Vendor Advisory amazon.com
Affected: Google LLC AWS S3 Crypto SDK for GoLang
Published at:
Updated at:

References

Link Tags
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 third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2020-8912?
CVE-2020-8912 has been scored as a low severity vulnerability.
How to fix CVE-2020-8912?
To fix CVE-2020-8912, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-8912 being actively exploited in the wild?
It is possible that CVE-2020-8912 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-8912?
CVE-2020-8912 affects Google LLC AWS S3 Crypto SDK for GoLang.
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