CVE-2020-8911 Information

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.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Reference

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

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.6