User with privilege escalation by actions 'iam:SetDefaultPolicyVersion'

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Metadata

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

Provider: AWS

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

Granting the iam:SetDefaultPolicyVersion action with a resource of "*" allows a user to set any version of any IAM policy as the default, including attaching more permissive versions to roles or users. This creates a serious privilege escalation risk, as an attacker with these permissions could assign themselves or others elevated privileges by setting a policy version that permits broader or unauthorized access. If left unaddressed, this vulnerability could lead to full account compromise or unapproved actions throughout the AWS environment.

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:SetDefaultPolicyVersion",
        ]
        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]
}