CVE-2020-8911
Google LLC · published 2020-08-11
Source record Collected from the National Vulnerability Database (NVD)
Description
Description by Google Inc. via the CVE Program.
A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target's S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC's ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.
Status at the source
- NVD status: Modified
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| Google LLC | AWS S3 Crypto SDK for GoLang | stable – V1 and earlier: affected |
Products named in NVD's CPE match criteria (1)
cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 5.6 MEDIUM — as published by Google Inc. (Secondary)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - CVSS 3.1: 5.6 MEDIUM — as published by NIST (Primary)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - CVSS 2.0: 2.1 LOW — as published by NIST (Primary)
AV:L/AC:L/Au:N/C:P/I:N/A:N
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09
- https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9
- https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09
- https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9
Source dates: published 2020-08-11, last changed 2026-06-17. DeSpy's copy of this version is dated 2026-09-28.
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