CVE-2020-8911

Katalog CVE

CVSS 5.6 · Medium EPSS 0,35%

Kerentanan Use of a Broken or Risky Cryptographic Algorithm pada amazon aws s3 crypto sdk. Skor CVSS 3.1 5.6 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

11 Agustus 2020

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.6 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-327: Use of a Broken or Risky Cryptographic Algorithm

EPSS (30 hari)

0,35% peluang dieksploitasi; lebih tinggi dari 26,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 advisory vendor
• https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9 exploit · advisory pihak ketiga