User With Privilege Escalation By Actions 'iam:AttachRolePolicy'

• Query id: e227091e-2228-4b40-b046-fc13650d8e88
• Query name: User With Privilege Escalation By Actions 'iam:AttachRolePolicy'
• Platform: Terraform
• Severity: Medium
• Category: Access Control
• CWE: 269
• URL: Github

Description

User with privilege escalation by actions 'iam:AttachRolePolicy' and Resource set to '*'. For more information see https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation/.
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - tf file

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]
}

Code samples without security vulnerabilities

Negative test num. 1 - tf file

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 = "*"
      },
    ]
  })
}