Robustness weakness in AWS KMS and Encryption SDKs
CVE-2020-8897

4.8MEDIUM

Key Information:

Vendor

Amazon

Status
Aws Sdk
Vendor
CVE Published:
16 November 2020

What is CVE-2020-8897?

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.

Affected Version(s)

AWS SDK all stable < 2.0.0

References

https://github.com/google/security-research/security/advi...
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https://aws.amazon.com/blogs/security/improved-client-sid...
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CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thai Duong
.