AWSCodeStarServiceRole

Last Modified

Sep 8, 2026

September 8, 2026 at 01:03 PM UTC

Version

v12

Total Versions

Created

Sep 8, 2026

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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 6 documented escalation paths on any resource with no condition, and 1 more in a scoped form.
- codebuild-002codebuild:StartBuildunrestricted
- codebuild-003codebuild:StartBuildBatchunrestricted
- codedeploy-001codedeploy:CreateDeploymentunrestricted
- ec2-002ec2:ModifyInstanceAttribute + ec2:StopInstances + ec2:StartInstancesunrestricted
- ec2-004ec2:CreateLaunchTemplateVersion + ec2:ModifyLaunchTemplateunrestricted
- ec2-005ec2:CreateLaunchTemplateVersion + ec2:ModifyLaunchTemplateunrestricted
- cloudformation-002cloudformation:UpdateStackscoped
  - cloudformation:UpdateStack (via cloudformation:*Stack*): on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
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 grant itself more permissions
Grants the actions of 4 documented escalation paths, but only on named resources or under a condition. Review that scope before trusting it.
- iam-001iam:CreatePolicyVersionscoped
  - iam:CreatePolicyVersion: on arn:aws:iam::*:policy/CodeStar_*
- iam-005iam:PutRolePolicyscoped
  - iam:PutRolePolicy: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
- iam-008iam:AttachUserPolicyscoped
  - iam:AttachUserPolicy: condition iam:PolicyArn
- iam-009iam:AttachRolePolicyscoped
  - iam:AttachRolePolicy: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
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 launch resources that run as a more privileged role
Grants the actions of 8 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/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
  - cloudformation:CreateStack (via cloudformation:*Stack*): on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
- cloudformation-003iam:PassRole + cloudformation:CreateStackSet + cloudformation:CreateStackInstancesscoped
  - iam:PassRole: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
  - cloudformation:CreateStackSet (via cloudformation:*Stack*): on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
  - cloudformation:CreateStackInstances (via cloudformation:*Stack*): on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
- cloudformation-004iam:PassRole + cloudformation:UpdateStackSetscoped
  - iam:PassRole: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
  - cloudformation:UpdateStackSet (via cloudformation:*Stack*): on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
- cloudformation-005cloudformation:CreateChangeSet + cloudformation:ExecuteChangeSetscoped
  - cloudformation:CreateChangeSet: on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
  - cloudformation:ExecuteChangeSet: on arn:aws:cloudformation:*:*:stack/awscodestar-*, arn:aws:cloudformation:*:*:stack/awseb-*, arn:aws:cloudformation:*:*:stack/aws-cloud9-*
- codebuild-001iam:PassRole + codebuild:CreateProject + codebuild:StartBuildscoped
  - iam:PassRole: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
- codebuild-004iam:PassRole + codebuild:CreateProject + codebuild:StartBuildBatchscoped
  - iam:PassRole: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
- ec2-001iam:PassRole + ec2:RunInstancesscoped
  - iam:PassRole: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
- ec2-003iam:PassRole + ec2:RequestSpotInstancesscoped
  - iam:PassRole: on arn:aws:iam::*:role/CodeStarWorker*, arn:aws:iam::*:policy/CodeStarWorker*, arn:aws:iam::*:instance-profile/awscodestar-*
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 switch off security monitoring
Can delete VPC flow logs, delete CloudWatch log groups, which is how an intruder hides.
ec2:DeleteFlowLogs (via ec2:*)logs:DeleteLogGroup (via logs:*)
Use with caution: Deny these actions with an SCP for everyone outside a break-glass role, so no single policy can blind you.
Medium
Can rewrite resource policies and sharing
Grants 19 permissions management actions across 4 services (codebuild, ec2, logs, sns) on any resource, enough to share resources outside the account.
codebuild:deleteresourcepolicycodebuild:putresourcepolicyec2:createcoippoolpermissionec2:createlocalgatewayroutetablepermissionec2:createnetworkinterfacepermissionec2:deletecoippoolpermissionec2:deletelocalgatewayroutetablepermissionec2:deletenetworkinterfacepermissionec2:deleteresourcepolicyec2:disableimageblockpublicaccessec2:disablesnapshotblockpublicaccessec2:enableimageblockpublicaccessand 7 more
Use with caution: Turn on IAM Access Analyzer external access findings, and keep account-level guards like S3 Block Public Access enabled.
Medium
Full access to 11 services on every resource
Uses autoscaling:*, codebuild:*, codecommit:*, codedeploy:*, codepipeline:*, codestar:*, ec2:*, elasticbeanstalk:* and 3 more with Resource "*" and no condition, so every action AWS adds to those services later is granted too.
autoscaling:*codebuild:*codecommit:*codedeploy:*codepipeline:*codestar:*ec2:*elasticbeanstalk:*elasticloadbalancing:*logs:*sns:*
Use with caution: The grant grows every time the service does. For long-lived access, prefer a policy that lists the actions you actually need.

Policy Document

View on GitHub

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235{
  "PolicyVersion": {
    "Document": {
      "Version": "2012-10-17",
      "Statement": [
        {
          "Sid": "ProjectEventRules",
          "Effect": "Allow",
          "Action": [
            "events:PutTargets",
            "events:RemoveTargets",
            "events:PutRule",
            "events:DeleteRule",
            "events:DescribeRule"
          ],
          "Resource": [
            "arn:aws:events:*:*:rule/awscodestar-*"
          ]
        },
        {
          "Sid": "ProjectStack",
          "Effect": "Allow",
          "Action": [
            "cloudformation:*Stack*",
            "cloudformation:CreateChangeSet",
            "cloudformation:ExecuteChangeSet",
            "cloudformation:DeleteChangeSet",
            "cloudformation:GetTemplate"
          ],
          "Resource": [
            "arn:aws:cloudformation:*:*:stack/awscodestar-*",
            "arn:aws:cloudformation:*:*:stack/awseb-*",
            "arn:aws:cloudformation:*:*:stack/aws-cloud9-*",
            "arn:aws:cloudformation:*:aws:transform/CodeStar*"
          ]
        },
        {
          "Sid": "ProjectStackTemplate",
          "Effect": "Allow",
          "Action": [
            "cloudformation:GetTemplateSummary",
            "cloudformation:DescribeChangeSet"
          ],
          "Resource": "*"
        },
        {
          "Sid": "CloudFormationTagOnCreate",
          "Effect": "Allow",
          "Action": [
            "cloudformation:TagResource",
            "cloudformation:UntagResource"
          ],
          "Resource": [
            "arn:aws:cloudformation:*:*:stack/awscodestar-*",
            "arn:aws:cloudformation:*:*:stack/awseb-*",
            "arn:aws:cloudformation:*:*:stack/aws-cloud9-*",
            "arn:aws:cloudformation:*:aws:transform/CodeStar*"
          ],
          "Condition": {
            "StringEquals": {
              "cloudformation:CreateAction": [
                "CreateStack",
                "UpdateStack",
                "CreateChangeSet",
                "ExecuteChangeSet"
              ]
            }
          }
        },
        {
          "Sid": "ProjectQuickstarts",
          "Effect": "Allow",
          "Action": [
            "s3:GetObject"
          ],
          "Resource": [
            "arn:aws:s3:::awscodestar-*/*"
          ]
        },
        {
          "Sid": "ProjectS3Buckets",
          "Effect": "Allow",
          "Action": [
            "s3:*"
          ],
          "Resource": [
            "arn:aws:s3:::aws-codestar-*",
            "arn:aws:s3:::elasticbeanstalk-*"
          ]
        },
        {
          "Sid": "ProjectServices",
          "Effect": "Allow",
          "Action": [
            "codestar:*",
            "codecommit:*",
            "codepipeline:*",
            "codedeploy:*",
            "codebuild:*",
            "autoscaling:*",
            "cloudwatch:Put*",
            "ec2:*",
            "elasticbeanstalk:*",
            "elasticloadbalancing:*",
            "iam:ListRoles",
            "logs:*",
            "sns:*",
            "cloud9:CreateEnvironmentEC2",
            "cloud9:DeleteEnvironment",
            "cloud9:DescribeEnvironment*",
            "cloud9:ListEnvironments"
          ],
          "Resource": "*"
        },
        {
          "Sid": "ProjectWorkerRoles",
          "Effect": "Allow",
          "Action": [
            "iam:AttachRolePolicy",
            "iam:CreateRole",
            "iam:DeleteRole",
            "iam:DeleteRolePolicy",
            "iam:DetachRolePolicy",
            "iam:GetRole",
            "iam:PassRole",
            "iam:GetRolePolicy",
            "iam:PutRolePolicy",
            "iam:SetDefaultPolicyVersion",
            "iam:CreatePolicy",
            "iam:DeletePolicy",
            "iam:AddRoleToInstanceProfile",
            "iam:CreateInstanceProfile",
            "iam:DeleteInstanceProfile",
            "iam:RemoveRoleFromInstanceProfile"
          ],
          "Resource": [
            "arn:aws:iam::*:role/CodeStarWorker*",
            "arn:aws:iam::*:policy/CodeStarWorker*",
            "arn:aws:iam::*:instance-profile/awscodestar-*"
          ]
        },
        {
          "Sid": "ProjectTeamMembers",
          "Effect": "Allow",
          "Action": [
            "iam:AttachUserPolicy",
            "iam:DetachUserPolicy"
          ],
          "Resource": "*",
          "Condition": {
            "ArnEquals": {
              "iam:PolicyArn": [
                "arn:aws:iam::*:policy/CodeStar_*"
              ]
            }
          }
        },
        {
          "Sid": "ProjectRoles",
          "Effect": "Allow",
          "Action": [
            "iam:CreatePolicy",
            "iam:DeletePolicy",
            "iam:CreatePolicyVersion",
            "iam:DeletePolicyVersion",
            "iam:ListEntitiesForPolicy",
            "iam:ListPolicyVersions",
            "iam:GetPolicy",
            "iam:GetPolicyVersion"
          ],
          "Resource": [
            "arn:aws:iam::*:policy/CodeStar_*"
          ]
        },
        {
          "Sid": "InspectServiceRole",
          "Effect": "Allow",
          "Action": [
            "iam:ListAttachedRolePolicies"
          ],
          "Resource": [
            "arn:aws:iam::*:role/aws-codestar-service-role",
            "arn:aws:iam::*:role/service-role/aws-codestar-service-role"
          ]
        },
        {
          "Sid": "IAMLinkRole",
          "Effect": "Allow",
          "Action": [
            "iam:CreateServiceLinkedRole"
          ],
          "Resource": "*",
          "Condition": {
            "StringEquals": {
              "iam:AWSServiceName": "cloud9.amazonaws.com"
            }
          }
        },
        {
          "Sid": "DescribeConfigRuleForARN",
          "Effect": "Allow",
          "Action": [
            "config:DescribeConfigRules"
          ],
          "Resource": [
            "*"
          ]
        },
        {
          "Sid": "ProjectCodeStarConnections",
          "Effect": "Allow",
          "Action": [
            "codestar-connections:UseConnection",
            "codestar-connections:GetConnection"
          ],
          "Resource": "*"
        },
        {
          "Sid": "ProjectCodeStarConnectionsPassConnections",
          "Effect": "Allow",
          "Action": "codestar-connections:PassConnection",
          "Resource": "*",
          "Condition": {
            "StringEqualsIfExists": {
              "codestar-connections:PassedToService": "codepipeline.amazonaws.com"
            }
          }
        }
      ]
    },
    "VersionId": "v12",
    "IsDefaultVersion": true,
    "CreateDate": "2026-09-08T12:47:08+00:00"
  }
}

Version History (13 recorded)

Raw history

v12updated

2 actions added

Sep 8, 2026

60b817c

AWSCodeStarServiceRole - Policy Version v11