AWSLambdaFullAccess

Last Modified

Sep 16, 2019

September 16, 2019 at 03:19 PM UTC

Version

Total Versions

Created

Nov 27, 2017

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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 change identities and their permissions
Grants 1 permissions management action on IAM, IAM Identity Center or Organizations, on any resource with no condition.
iam:passrole
Use with caution: Grant it only to identity administrators, and protect your admin roles and SCPs with a permissions boundary or an SCP of their own.
High
Can launch resources that run as a more privileged role
Grants every action of 3 documented escalation paths on any resource with no condition.
- lambda-001iam:PassRole + lambda:CreateFunction + lambda:InvokeFunctionunrestricted
- lambda-002iam:PassRole + lambda:CreateFunction + lambda:CreateEventSourceMappingunrestricted
- lambda-006iam:PassRole + lambda:CreateFunction + lambda:AddPermissionunrestricted
Use with caution: Make sure no highly privileged role trusts the service involved, and restrict iam:PassRole in your own policies or boundary to named roles with iam:PassedToService.
High
Can take over existing resources that run as another role
Grants every action of 3 documented escalation paths on any resource with no condition.
- lambda-003lambda:UpdateFunctionCodeunrestricted
- lambda-004lambda:UpdateFunctionCode + lambda:InvokeFunctionunrestricted
- lambda-005lambda:UpdateFunctionCode + lambda:AddPermissionunrestricted
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 switch off security monitoring
Can delete CloudWatch log groups, which is how an intruder hides.
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 read secrets
Reads Lambda environment variables, where credentials often live, on any resource with no condition.
lambda:GetFunctionConfiguration (via lambda:*)
Use with caution: Where the holder needs only some secrets, write your own policy scoped to their ARNs or tags, and limit decryption in the KMS key policies.
Medium
Can rewrite resource policies and sharing
Grants 47 permissions management actions across 7 services (cloudwatch, dynamodb, events, iot, lambda, logs, ...) on any resource, enough to share resources outside the account.
cloudwatch:assumeaccessprofilecloudwatch:createaccessgrantcloudwatch:createaccessprofilecloudwatch:createdomainaccessgrantfororganizationcloudwatch:deleteaccessgrantcloudwatch:deleteaccessprofilecloudwatch:deletedomainaccessgrantfororganizationcloudwatch:updateaccessprofiledynamodb:deleteresourcepolicydynamodb:putresourcepolicyevents:deleteresourcepolicyevents:putpermissionand 35 more
Use with caution: Turn on IAM Access Analyzer external access findings, and keep account-level guards like S3 Block Public Access enabled.
Medium
Can read data in every bucket or table
Reads any object in any S3 bucket; any DynamoDB table. Read-only is not the same as harmless when the data is the asset.
s3:GetObject (via s3:*)dynamodb:Scan (via dynamodb:*)dynamodb:GetItem (via dynamodb:*)
Use with caution: Read access to data is still access to data. For people who only need to see configuration, ViewOnlyAccess carries none of these signals.
Medium
Full access to 6 services on every resource
Uses cloudwatch:*, dynamodb:*, events:*, lambda:*, logs:*, s3:* with Resource "*" and no condition, so every action AWS adds to those services later is granted too.
cloudwatch:*dynamodb:*events:*lambda:*logs:*s3:*
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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70{
  "PolicyVersion": {
    "Document": {
      "Version": "2012-10-17",
      "Statement": [
        {
          "Effect": "Allow",
          "Action": [
            "cloudformation:DescribeChangeSet",
            "cloudformation:DescribeStackResources",
            "cloudformation:DescribeStacks",
            "cloudformation:GetTemplate",
            "cloudformation:ListStackResources",
            "cloudwatch:*",
            "cognito-identity:ListIdentityPools",
            "cognito-sync:GetCognitoEvents",
            "cognito-sync:SetCognitoEvents",
            "dynamodb:*",
            "ec2:DescribeSecurityGroups",
            "ec2:DescribeSubnets",
            "ec2:DescribeVpcs",
            "events:*",
            "iam:GetPolicy",
            "iam:GetPolicyVersion",
            "iam:GetRole",
            "iam:GetRolePolicy",
            "iam:ListAttachedRolePolicies",
            "iam:ListRolePolicies",
            "iam:ListRoles",
            "iam:PassRole",
            "iot:AttachPrincipalPolicy",
            "iot:AttachThingPrincipal",
            "iot:CreateKeysAndCertificate",
            "iot:CreatePolicy",
            "iot:CreateThing",
            "iot:CreateTopicRule",
            "iot:DescribeEndpoint",
            "iot:GetTopicRule",
            "iot:ListPolicies",
            "iot:ListThings",
            "iot:ListTopicRules",
            "iot:ReplaceTopicRule",
            "kinesis:DescribeStream",
            "kinesis:ListStreams",
            "kinesis:PutRecord",
            "kms:ListAliases",
            "lambda:*",
            "logs:*",
            "s3:*",
            "sns:ListSubscriptions",
            "sns:ListSubscriptionsByTopic",
            "sns:ListTopics",
            "sns:Publish",
            "sns:Subscribe",
            "sns:Unsubscribe",
            "sqs:ListQueues",
            "sqs:SendMessage",
            "tag:GetResources",
            "xray:PutTelemetryRecords",
            "xray:PutTraceSegments"
          ],
          "Resource": "*"
        }
      ]
    },
    "VersionId": "v8",
    "IsDefaultVersion": true,
    "CreateDate": "2017-11-27T23:22:38Z"
  }
}