CVE-2020-8912

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Summary

CVECVE-2020-8912
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-08-11 20:15:00 UTC
Updated2020-08-17 19:31:00 UTC
DescriptionA 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.

Risk And Classification

Problem Types: CWE-327

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Amazon Aws S3 Crypto Sdk All All All All
Application Amazon Aws S3 Crypto Sdk All All All All

References

ReferenceSourceLinkTags
In-band key negotiation issue in AWS S3 Crypto SDK for golang · Advisory · google/security-research · GitHub CONFIRM github.com Exploit, Third Party Advisory
Updates to the Amazon S3 Encryption Client | AWS Developer Blog CONFIRM aws.amazon.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Sophie Schmieg

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