AWSOpsWorksCMServiceRole

Last Modified

Sep 18, 2024

September 18, 2024 at 10:06 AM UTC

Version

v14

Total Versions

Created

Apr 23, 2021

Actions

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Risk

High

An unrestricted escalation path, identity administration, secret reads or the power to switch off security monitoring. Read from this policy document alone: trust policies, boundaries and SCPs in your account still decide what actually succeeds. How this is assessed

High
Can take over existing resources that run as another role
Grants every action of 1 documented escalation path on any resource with no condition, and 1 more in a scoped form.
- ssm-002ssm:SendCommandunrestricted
- cloudformation-002cloudformation:UpdateStackscoped
  - cloudformation:UpdateStack: on arn:aws:cloudformation:*:*:stack/aws-opsworks-cm-*
Use with caution: List the roles attached to the functions, instances, pipelines or notebooks it can modify: the holder effectively has them too.
Medium
Can launch resources that run as a more privileged role
Grants the actions of 2 documented escalation paths, but only on named resources or under a condition. Review that scope before trusting it.
- cloudformation-001iam:PassRole + cloudformation:CreateStackscoped
  - iam:PassRole: on arn:aws:iam::*:role/aws-opsworks-cm-*, arn:aws:iam::*:role/service-role/aws-opsworks-cm-*
  - cloudformation:CreateStack: on arn:aws:cloudformation:*:*:stack/aws-opsworks-cm-*
- ec2-001iam:PassRole + ec2:RunInstancesscoped
  - iam:PassRole: on arn:aws:iam::*:role/aws-opsworks-cm-*, arn:aws:iam::*:role/service-role/aws-opsworks-cm-*
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.

Policy Document

View on GitHub

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183{
  "PolicyVersion": {
    "CreateDate": "2021-04-23T17:32:13Z",
    "VersionId": "v14",
    "Document": {
      "Version": "2012-10-17",
      "Statement": [
        {
          "Action": [
            "s3:CreateBucket",
            "s3:DeleteObject",
            "s3:DeleteBucket",
            "s3:GetObject",
            "s3:ListBucket",
            "s3:PutBucketPolicy",
            "s3:PutObject",
            "s3:GetBucketTagging",
            "s3:PutBucketTagging"
          ],
          "Resource": [
            "arn:aws:s3:::aws-opsworks-cm-*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "tag:UntagResources",
            "tag:TagResources"
          ],
          "Resource": [
            "*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "ssm:DescribeInstanceInformation",
            "ssm:GetCommandInvocation",
            "ssm:ListCommandInvocations",
            "ssm:ListCommands"
          ],
          "Resource": [
            "*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "ssm:SendCommand"
          ],
          "Resource": [
            "*"
          ],
          "Effect": "Allow",
          "Condition": {
            "StringLike": {
              "ssm:resourceTag/aws:cloudformation:stack-name": "aws-opsworks-cm-*"
            }
          }
        },
        {
          "Action": [
            "ssm:SendCommand"
          ],
          "Resource": [
            "arn:aws:ssm:*::document/*",
            "arn:aws:s3:::aws-opsworks-cm-*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "ec2:AllocateAddress",
            "ec2:AssociateAddress",
            "ec2:AuthorizeSecurityGroupIngress",
            "ec2:CreateImage",
            "ec2:CreateSecurityGroup",
            "ec2:CreateSnapshot",
            "ec2:CreateTags",
            "ec2:DeleteSecurityGroup",
            "ec2:DeleteSnapshot",
            "ec2:DeregisterImage",
            "ec2:DescribeAccountAttributes",
            "ec2:DescribeAddresses",
            "ec2:DescribeImages",
            "ec2:DescribeInstanceStatus",
            "ec2:DescribeInstances",
            "ec2:DescribeSecurityGroups",
            "ec2:DescribeSnapshots",
            "ec2:DescribeSubnets",
            "ec2:DisassociateAddress",
            "ec2:ReleaseAddress",
            "ec2:RunInstances",
            "ec2:StopInstances"
          ],
          "Resource": [
            "*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "ec2:TerminateInstances",
            "ec2:RebootInstances"
          ],
          "Resource": [
            "*"
          ],
          "Effect": "Allow",
          "Condition": {
            "StringLike": {
              "ec2:ResourceTag/aws:cloudformation:stack-name": "aws-opsworks-cm-*"
            }
          }
        },
        {
          "Action": [
            "opsworks-cm:DeleteServer",
            "opsworks-cm:StartMaintenance"
          ],
          "Resource": [
            "arn:aws:opsworks-cm:*:*:server/*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "cloudformation:CreateStack",
            "cloudformation:DeleteStack",
            "cloudformation:DescribeStackEvents",
            "cloudformation:DescribeStackResources",
            "cloudformation:DescribeStacks",
            "cloudformation:UpdateStack"
          ],
          "Resource": [
            "arn:aws:cloudformation:*:*:stack/aws-opsworks-cm-*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "iam:PassRole"
          ],
          "Resource": [
            "arn:aws:iam::*:role/aws-opsworks-cm-*",
            "arn:aws:iam::*:role/service-role/aws-opsworks-cm-*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "acm:DeleteCertificate",
            "acm:ImportCertificate"
          ],
          "Resource": "*",
          "Effect": "Allow"
        },
        {
          "Action": [
            "secretsmanager:CreateSecret",
            "secretsmanager:GetSecretValue",
            "secretsmanager:UpdateSecret",
            "secretsmanager:DeleteSecret",
            "secretsmanager:TagResource",
            "secretsmanager:UntagResource"
          ],
          "Resource": "arn:aws:secretsmanager:*:*:opsworks-cm!aws-opsworks-cm-secrets-*",
          "Effect": "Allow"
        },
        {
          "Action": "ec2:DeleteTags",
          "Resource": [
            "arn:aws:ec2:*:*:instance/*",
            "arn:aws:ec2:*:*:elastic-ip/*",
            "arn:aws:ec2:*:*:security-group/*"
          ],
          "Effect": "Allow"
        }
      ]
    },
    "IsDefaultVersion": true
  }
}