CVE-2020-8912
low-risk
Published 2020-08-11
A 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.
Do I need to act?
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0.14% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
2
CVSS 2.5/10
Low
LOCAL
/ HIGH complexity
Affected Products (1)
Aws S3 Crypto Sdk
Affected Vendors
References (4)
12
/ 100
low-risk
Severity
6/34 · Minimal
Exploitability
1/34 · Minimal
Exposure
5/34 · Minimal