CVE-2020-8912

Aliases:GHSA-7f33-f4f5-xwgwGO-2022-0635
Advisory lineage Upstream: 0 Downstream: 1
Modified
Published: 11 Aug 2020, 19:20
Last modified:04 Aug 2024, 10:12

Vulnerability Summary

Overall Risk (default)
low
20/100
CVSS Score
2.5 LOW
v3.1 (cve.org)
EPSS Score
0.14% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

11 Aug 2020, 19:20
Published
Vulnerability first disclosed
04 Aug 2024, 10:12
Last Modified
Vulnerability information updated

Description

A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.

CVSS Metrics

  • v3.1•LOW•Score: 2.5CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.14%• Percentile: 34%

Techniques & Countermeasures

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

    The product uses a broken or risky cryptographic algorithm or protocol.

Affected Systems

  • amazon•aws_s3_crypto_sdk

    < 2.0

  • github.com/aws•aws-sdk-go

    all | < 1.34.0

  • google llc•aws s3 crypto sdk for golang

    ≥ stable, ≤ V1

References (10)