CVE-2020-8911
AWS S3 Crypto SDK for GoLang Padding Oracle Attack
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.
INFO
Published Date :
Aug. 11, 2020, 8:15 p.m.
Last Modified :
Aug. 18, 2020, 1:37 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
1.1
Public PoC/Exploit Available at Github
CVE-2020-8911 has a 7 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-8911.
| URL | 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
None
gh repo clone jassics/awesome-aws-security
None
Scan images of all running containers on the host using trivy
Dockerfile Shell
This repo has been replaced by https://www.cloudvulndb.org
Curated list of links, references, books videos, tutorials (Free or Paid), Exploit, CTFs, Hacking Practices etc. which are related to AWS Security
cloud-security aws-security awesome-list aws security security-tools aws-auditing awesome-lists aws-security-resources awesome aws-security-automation
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-8911 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-8911 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Aug. 18, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Changed Reference Type https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 No Types Assigned https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 Vendor Advisory Changed Reference Type https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9 No Types Assigned https://github.com/google/security-research/security/advisories/GHSA-f5pg-7wfw-84q9 Exploit, Third Party Advisory Added CWE NIST CWE-327 Added CPE Configuration OR *cpe:2.3:a:amazon:aws_s3_crypto_sdk:*:*:*:*:*:golang:*:* versions up to (excluding) 2.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-8911 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-8911
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} 0.00%
score
0.17578
percentile