CVE-2020-8911 Detail

Current Description

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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  Google Inc.
Base Score:  5.6 MEDIUM
Vector:  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 Vendor Advisory 
https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9 Exploit  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-327 Use of a Broken or Risky Cryptographic Algorithm cwe source acceptance level NIST   Reference acceptance level Google Inc.  

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Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-8911
NVD Published Date:
08/11/2020
NVD Last Modified:
08/18/2020
Source:
MITRE