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.
References
| Link | Resource |
|---|---|
| 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 |
| 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 |
Configurations
History
21 Nov 2024, 05:39
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 - Vendor Advisory | |
| References | () https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9 - Exploit, Third Party Advisory |
Information
Published : 2020-08-11 20:15
Updated : 2024-11-21 05:39
NVD link : CVE-2020-8911
Mitre link : CVE-2020-8911
CVE.ORG link : CVE-2020-8911
JSON object : View
Products Affected
amazon
- aws_s3_crypto_sdk
CWE
CWE-327
Use of a Broken or Risky Cryptographic Algorithm