CVE-2020-8897

Public Exploit
Robustness weakness in AWS KMS and Encryption SDKs

Description

A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C and Javalcript prior to versions 2.0.0. Due to the non-committing property of AES-GCM (and other AEAD ciphers such as AES-GCM-SIV or (X)ChaCha20Poly1305) used by the SDKs to encrypt messages, an attacker can craft a unique cyphertext which will decrypt to multiple different results, and becomes especially relevant in a multi-recipient setting. We recommend users update their SDK to 2.0.0 or later.

Categories

4.8
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.09%
Vendor Advisory amazon.com
Affected: Amazon AWS SDK
Published at:
Updated at:

References

Link Tags
https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf exploit third party advisory mitigation
https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-8897?
CVE-2020-8897 has been scored as a medium severity vulnerability.
How to fix CVE-2020-8897?
To fix CVE-2020-8897, 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-2020-8897 being actively exploited in the wild?
It is possible that CVE-2020-8897 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-2020-8897?
CVE-2020-8897 affects Amazon AWS SDK.
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