AWSB9InternalServicePolicy

Last Modified

Sep 16, 2019

September 16, 2019 at 03:19 PM UTC

Version

Total Versions

Created

Dec 13, 2018

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Risk

Medium

The same capabilities in a scoped form, resource policy writes, reads across all data, or full access to a whole service. Read from this policy document alone: trust policies, boundaries and SCPs in your account still decide what actually succeeds. How this is assessed

Medium
Can take over existing resources that run as another role
Grants the actions of 1 documented escalation path, but only on named resources or under a condition. Review that scope before trusting it.
- lambda-003lambda:UpdateFunctionCodescoped
  - lambda:UpdateFunctionCode: on arn:aws:lambda:*:*:function:aws-robomaker-*
Use with caution: Check which roles, users or policies fall inside the scope shown above. Within it the escalation works as documented, so keep privileged principals out of it.
Medium
Can rewrite resource policies and sharing
Grants 1 permissions management action across 1 service (ec2) on any resource, enough to share resources outside the account.
ec2:createnetworkinterfacepermission
Use with caution: Turn on IAM Access Analyzer external access findings, and keep account-level guards like S3 Block Public Access enabled.

Policy Document

View on GitHub

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54{
  "PolicyVersion": {
    "Document": {
      "Version": "2012-10-17",
      "Statement": [
        {
          "Action": [
            "ec2:CreateNetworkInterfacePermission",
            "ec2:DescribeNetworkInterfaces",
            "ec2:DeleteNetworkInterface",
            "ec2:DescribeSubnets",
            "ec2:DescribeVpcs",
            "ec2:DescribeSecurityGroups",
            "greengrass:CreateDeployment",
            "greengrass:CreateGroupVersion",
            "greengrass:CreateFunctionDefinition",
            "greengrass:CreateFunctionDefinitionVersion",
            "greengrass:GetDeploymentStatus",
            "greengrass:GetGroup",
            "greengrass:GetGroupVersion",
            "greengrass:GetCoreDefinitionVersion",
            "greengrass:GetFunctionDefinitionVersion",
            "greengrass:GetAssociatedRole",
            "lambda:CreateFunction"
          ],
          "Effect": "Allow",
          "Resource": "*"
        },
        {
          "Action": [
            "lambda:UpdateFunctionCode",
            "lambda:GetFunction",
            "lambda:UpdateFunctionConfiguration"
          ],
          "Effect": "Allow",
          "Resource": "arn:aws:lambda:*:*:function:aws-robomaker-*"
        },
        {
          "Effect": "Allow",
          "Action": "iam:PassRole",
          "Resource": "*",
          "Condition": {
            "StringEqualsIfExists": {
              "iam:PassedToService": "lambda.amazonaws.com"
            }
          }
        }
      ]
    },
    "VersionId": "v1",
    "IsDefaultVersion": true,
    "CreateDate": "2018-12-13T18:48:22Z"
  }
}