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TI-2020-07157 Aliases CVE-2020-8911GHSA-f5pg-7wfw-84q9

CBC padding oracle in AWS S3 Crypto SDK for GoLang

Priority LOW 25CWE-327Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 1 fixed, 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-327.

Summary

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.

Why it matters now

EPSS 0.00346 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial github.com/aws/aws-sdk-go (Go): 1.34.0Red Hat: 1 advisoryRed Hat: 1 fixed, 4 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
GoogleAWS S3 Crypto SDK for GoLangstable – V1—No fix listedCNA
—github.com/aws/aws-sdk-go (Go)before 1.34.01.34.0Patch availableGHSA-f5pg-7wfw-84q9
  • AWS S3 Crypto SDK for GoLang VendorGoogle Affected stable – V1 Fixed in — No fix listed CNA
  • github.com/aws/aws-sdk-go (Go) Vendor— Affected before 1.34.0 Fixed in 1.34.0 Patch available GHSA-f5pg-7wfw-84q9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:*before 2.0VulnerableAWS
  • cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:* Versions before 2.0 Vulnerable ·AWS

Remediation

  • Fix · GHSA-f5pg-7wfw-84q9 github.com/aws/aws-sdk-go (Go) Fixed in 1.34.0 Advisory →

Red Hat 1 advisory

  • RHSA-2021:3851 Released 2021-10-14 · Red Hat rating Important
    Red Hat 3scale API Management 2.11.0 Release - Container Images
    • Red Hat 3Scale AMP 2.11 3scale-amp2/3scale-rhel7-operator, 3scale-amp2/3scale-rhel7-operator-metadata, 3scale-amp2/apicast-gateway-rhel8 +7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
A-MQ Interconnect 1AffectedNo fix planned: Will not fix
OpenShift ServerlessAffectedNo fix planned: Will not fix
Red Hat Fuse 7AffectedNo fix planned: Will not fix
Red Hat Integration Service RegistryAffectedNo fix planned: Will not fix
Red Hat 3Scale AMP 2.11Fixed RHSA-2021:3851
Not affected: 11 products
  • OpenShift Service Mesh 1
  • Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Ceph Storage 2
  • Red Hat Ceph Storage 3
  • Red Hat Ceph Storage 4
  • Red Hat Cluster Application Migration
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift Container Platform 3.11
  • Red Hat OpenShift Container Platform 4
  • Red Hat Openshift Container Storage 4
  • Red Hat Storage 3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-8911
  2. 2026-10-03 Alias added: GHSA-f5pg-7wfw-84q9
  3. 2026-11-06 Affected versions changed · Red Hat

References

Exploit 1

Advisory 2

Other 7

  • TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-07390 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2024-04898 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2024-04600 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2024-04346 Use after free in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2023-05824 Integer overflow in Google Chrome KEVCVSS 3.1CRITICAL 9.6
See all 17247 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences