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Insecure authentication method - Basic

Description​

The server uses Basic authentication over an insecure channel.

Impact​

Gather base 64 coded credentials.

Recommendation​

Use stronger authentication mechanisms like Bearer and OAuth.

Threat​

Unauthorized attacker from adjacent network performing a Sniffing attack.

Expected Remediation Time​

⌚ 120 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base​

  • Attack vector: A
  • Attack complexity: L
  • Privileges required: N
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

  • Exploit code madurity: P
  • Remediation level: O
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
  • Score:
    • Base: 4.3
    • Temporal: 3.9
  • Severity:
    • Base: Medium
    • Temporal: Low

Code Examples​

Compliant code​

Implement a SSH key authentication for the sensitive resource

resource "azurerm_linux_virtual_machine" "not_vulnerable" {
  name           = "example-machine"
  size           = "Standard_F2"
  admin_username = "adminuser"

  admin_ssh_key {
    username   = "adminuser"
    public_key = file("~/.ssh/id_rsa.pub")
  }
}
resource "azurerm_virtual_machine" "not_vulnerable" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = [azurerm_network_interface.main.id]
  vm_size               = "Standard_DS1_v2"

  os_profile_linux_config {
    disable_password_authentication = false
    ssh_keys                        = ["${var.ssh_keys}"]
  }
}

Non compliant code​

Examples with virtual machines without strong auth mechanism defined

resource "azurerm_linux_virtual_machine" "vulnerable" {
  name           = "example-machine"
  size           = "Standard_F2"
  admin_username = "adminuser"
}
resource "azurerm_virtual_machine" "vulnerable" {
  name                  = "${var.prefix}-vm"
  location              = azurerm_resource_group.main.location
  resource_group_name   = azurerm_resource_group.main.name
  network_interface_ids = [azurerm_network_interface.main.id]
  vm_size               = "Standard_DS1_v2"

  os_profile_linux_config {
    disable_password_authentication = false
  }
}

Requirements​