CVE-2020-8897: Use of a Broken or Risky Cryptographic Algorithm

October 12, 2021

A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C and Javalcript 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 or later.

References

aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/
github.com/advisories/GHSA-wqgp-vphw-hphf
github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf
nvd.nist.gov/vuln/detail/CVE-2020-8897

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