Role with privilege escalation by actions 'iam:CreatePolicyVersion'

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Metadata

Id: terraform-aws-role-with-privilege-escalation-by-actions-iam-createpolicyversion

Provider: AWS

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

Granting the iam:CreatePolicyVersion action with a resource of "*" in an IAM policy allows a user to create new policy versions for any policy in the AWS account, including those attached to highly privileged roles. This capability can be exploited for privilege escalation, as a malicious or compromised user could attach or update policies to grant themselves broader permissions. To mitigate this risk, restrict the Resource attribute to specific policy ARNs and only grant this action to trusted administrative principals.

A more secure configuration would specify only necessary actions for the specific resources required. For example:

resource "aws_iam_user" "cosmic2" {
  name = "cosmic2"
}

resource "aws_iam_user_policy" "inline_policy_run_instances2" {
  name = "inline_policy_run_instances"
  user = aws_iam_user.cosmic2.name

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = [
          "ec2:Describe*",
        ]
        Effect   = "Allow"
        Resource = "*"
      },
    ]
  })
}

Compliant Code Examples

resource "aws_iam_user" "cosmic2" {
  name = "cosmic2"
}

resource "aws_iam_user_policy" "inline_policy_run_instances2" {
  name = "inline_policy_run_instances"
  user = aws_iam_user.cosmic2.name

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = [
          "ec2:Describe*",
        ]
        Effect   = "Allow"
        Resource = "*"
      },
    ]
  })
}

Non-Compliant Code Examples

resource "aws_iam_role" "cosmic" {
  name = "cosmic"
}

resource "aws_iam_role_policy" "test_inline_policy" {
  name = "test_inline_policy"
  role = aws_iam_role.cosmic.name

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = [
          "iam:CreatePolicyVersion",
        ]
        Effect   = "Allow"
        Resource = "*"
      },
    ]
  })
}

resource "aws_iam_role" "indexed" {
  count = 1
  name  = "indexed-role"
}

resource "aws_iam_role_policy" "dangerous_indexed" {
  name = "dangerous_indexed"
  role = aws_iam_role.indexed[0].id

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = [
          "iam:CreatePolicyVersion",
        ]
        Effect   = "Allow"
        Resource = "*"
      },
    ]
  })
}

locals {
  role_indexes = [0]
}

resource "aws_iam_role" "nested_indexed" {
  count = 1
  name  = "nested-indexed-role"
}

resource "aws_iam_role_policy" "dangerous_nested_index" {
  name = "dangerous_nested_index"
  role = aws_iam_role.nested_indexed[local.role_indexes[count.index]].id

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = [
          "iam:CreatePolicyVersion",
        ]
        Effect   = "Allow"
        Resource = "*"
      },
    ]
  })
}