CVE-2020-8897: Robustness weakness in AWS KMS and Encryption SDKs
First published: Mon Nov 16 2020(Updated: )
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.
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/aws-encryption-sdk | <2.0.0 | 2.0.0 |
| maven/com.amazonaws:aws-encryption-sdk-java | <2.0.0 | 2.0.0 |
| Amazon AWS Encryption SDK | <2.0.0 |
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Reference Links
- https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/
- https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf
- https://nvd.nist.gov/vuln/detail/CVE-2020-8897
- https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment
- https://github.com/pypa/advisory-database/tree/main/vulns/aws-encryption-sdk/PYSEC-2020-261.yaml
- https://github.com/advisories/GHSA-wqgp-vphw-hphf (Advisory)
Frequently Asked Questions
What is the severity of CVE-2020-8897?
CVE-2020-8897 is classified as a weakness in the AWS Encryption SDKs affecting their robustness due to the use of non-committing AEAD ciphers.
How do I fix CVE-2020-8897?
To fix CVE-2020-8897, upgrade to version 2.0.0 or later of the AWS Encryption SDK for Java, Python, C, or JavaScript.
What software is affected by CVE-2020-8897?
CVE-2020-8897 affects AWS Encryption SDKs for Java, Python, C, and JavaScript versions prior to 2.0.0.
Is CVE-2020-8897 a critical vulnerability?
CVE-2020-8897 is not considered critical but poses a risk due to its weak encryption properties.
What encryption methods are implicated in CVE-2020-8897?
CVE-2020-8897 involves the AES-GCM encryption method as well as other AEAD ciphers like AES-GCM-SIV and (X)ChaCha20Poly1305.
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