User with privilege escalation by actions 'iam:AttachRolePolicy'

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Metadata

Id: terraform-aws-user-with-privilege-escalation-by-actions-iam-attachrolepolicy

Provider: AWS

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

Granting the iam:AttachRolePolicy action with a resource value of "*" allows the user to attach any policy to any IAM role, enabling privilege escalation if the user can attach policies granting additional permissions or even administrator-level access. This misconfiguration can lead to unauthorized access across your AWS environment, as users may obtain permissions far beyond their original scope. To remediate, policy statements should scope the Resource field to only those roles and policies necessary for the user’s legitimate activities, avoiding the use of a wildcard (*).

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_user" "cosmic" {
  name = "cosmic"
}

resource "aws_iam_user_policy" "test_inline_policy" {
  name = "test_inline_policy"
  user = aws_iam_user.cosmic.name

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


resource "aws_iam_policy_attachment" "test-attach" {
  name       = "test-attachment"
  users      = [aws_iam_user.cosmic.name]
  roles      = [aws_iam_role.role.name]
  groups     = [aws_iam_group.group.name]
}