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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: Google

Published: 2020-08-11T19:20:14

Updated: 2024-08-04T10:12:11.063Z

Reserved: 2020-02-12T00:00:00

Link: CVE-2020-8911

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2020-08-11T20:15:13.230

Modified: 2020-08-18T13:37:59.087

Link: CVE-2020-8911

cve-icon Redhat

Severity : Moderate

Publid Date: 2020-08-11T00:00:00Z

Links: CVE-2020-8911 - Bugzilla