CVE-2020-8911
Description
A flaw was found in the AWS S3 Crypto SDK that allows users to encrypt files stored in S3 buckets with AES-CBC, without computing a MAC on the data. This allows for a padding oracle, enabling attackers with both write access to the target S3 bucket and the ability to observe the result of valid decryption attempts to potentially recover original plaintext. This is not an issue if files in S3 buckets are not encrypted with CBC mode, which is disabled in V2 of the AWS S3 Crypto SDK.
Statement
The following products include components that use the AWS SDK (aws/aws-sdk-go), however they do not include code that encrypts or decrypts files in S3 buckets (aws/aws-sdk-go/service/s3/s3crypto). The below products are not affected by this flaw:
- Red Hat Cluster Application Migration
- Red Hat OpenShift Container Platform
- Red Hat OpenShift ServiceMesh
- Red Hat OpenShift Container Storage
- Red Hat Ceph Storage
- Red Hat Gluster Storage
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.6 | 5.6 | 5.6 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | High | High | High |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Changed | Changed | Changed |
| Confidentiality | High | High | High |
| Integrity Impact | None | None | None |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
The confidentiality of sensitive data may be compromised by the use of a broken or risky cryptographic algorithm.
Integrity
Technical Impact: Modify Application Data
The integrity of sensitive data may be compromised by the use of a broken or risky cryptographic algorithm.
Accountability,Non-Repudiation
Technical Impact: Hide Activities
If the cryptographic algorithm is used to ensure the identity of the source of the data (such as digital signatures), then a broken algorithm will compromise this scheme and the source of the data cannot be proven.
Frequently Asked Questions
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