What is the CVSS score of CVE-2020-8911?

CVE-2020-8911 has a CVSS 3.1 base score of 5.6 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for CVE-2020-8911?

Yes, a public proof-of-concept exploit is available for CVE-2020-8911. Prioritise patching immediately. EPSS: 0.3%.

Is there a patch available for CVE-2020-8911?

Yes, a patch is available for CVE-2020-8911. Update the affected software to the latest version immediately.

Amazon CVE-2020-8911

MEDIUM

Use of a Broken or Risky Cryptographic Algorithm (CWE-327)

2020-08-11 cve-coordination@google.com

Information Disclosure Oracle Amazon Aws S3 Crypto Sdk

5.6

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.6 MEDIUM

AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Aug 11, 2020 - 20:15 nvd

MEDIUM 5.6

DescriptionNVD

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.

AnalysisAI

A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. Rated medium severity (CVSS 5.6). Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-327. 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. Affected products include: Amazon Aws S3 Crypto Sdk.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.