CVE-2020-8911
CVSS V2 Low 2.1
CVSS V3 Medium 5.6
Description
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.
Overview
- CVE ID
- CVE-2020-8911
- Assigner
- cve-coordination@google.com
- Vulnerability Status
- Analyzed
- Published Version
- 2020-08-11T20:15:13
- Last Modified Date
- 2020-08-18T13:37:59
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:* | 1 | OR | 2.0 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:L/Au:N/C:P/I:N/A:N
- Access Vector
- LOCAL
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 2.1
- Severity
- LOW
- Exploitability Score
- 3.9
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
- Attack Vector
- LOCAL
- Attack Compatibility
- HIGH
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 5.6
- Base Severity
- MEDIUM
- Exploitability Score
- 1.1
- Impact Score
- 4
References
| Reference URL | Reference Tags |
|---|---|
| https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 | Vendor Advisory |
| https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9 | Exploit Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-8911 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8911 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 17:20:25 | Added to TrackCVE | |||
| 2022-12-04 20:50:10 | security@google.com | cve-coordination@google.com | CVE Assigner | updated |
| 2022-12-04 20:50:10 | 2020-08-11T20:15Z | 2020-08-11T20:15:13 | CVE Published Date | updated |
| 2022-12-04 20:50:10 | 2020-08-18T13:37:59 | CVE Modified Date | updated | |
| 2022-12-04 20:50:10 | Analyzed | Vulnerability Status | updated |