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Redis entirely accessible

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Metadata

Id: terraform-azure-redis-entirely-accessible

Provider: Azure

Platform: Terraform

Severity: Critical

Category: Networking and Firewall

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Description

This check identifies Azure Redis Cache instances with firewall rules that permit access from any IP address (0.0.0.0/0), effectively exposing the Redis cache to the entire internet. When firewall rules are configured with start_ip and end_ip set to 0.0.0.0, it creates a significant security vulnerability by allowing unrestricted access to your Redis cache. Instead, restrict access by specifying a limited IP range, as shown below:

// Insecure configuration
resource "azurerm_redis_firewall_rule" "insecure" {
  start_ip = "0.0.0.0"
  end_ip   = "0.0.0.0"
}

// Secure configuration
resource "azurerm_redis_firewall_rule" "secure" {
  start_ip = "10.2.3.4"
  end_ip   = "10.3.4.5"
}

Compliant Code Examples

resource "azurerm_redis_cache" "negative1" {
  name                = "redis${random_id.server.hex}"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  capacity            = 1
  family              = "P"
  sku_name            = "Premium"
  enable_non_ssl_port = false

  redis_configuration {
    maxclients         = 256
    maxmemory_reserved = 2
    maxmemory_delta    = 2
    maxmemory_policy   = "allkeys-lru"
  }
}

resource "azurerm_redis_firewall_rule" "negative2" {
  name                = "someIPrange"
  redis_cache_name    = azurerm_redis_cache.example.name
  resource_group_name = azurerm_resource_group.example.name
  start_ip            = "10.2.3.4"
  end_ip              = "10.3.4.5"
}

Non-Compliant Code Examples

resource "azurerm_redis_cache" "positive1" {
  name                = "redis${random_id.server.hex}"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  capacity            = 1
  family              = "P"
  sku_name            = "Premium"
  enable_non_ssl_port = false

  redis_configuration {
    maxclients         = 256
    maxmemory_reserved = 2
    maxmemory_delta    = 2
    maxmemory_policy   = "allkeys-lru"
  }
}

resource "azurerm_redis_firewall_rule" "positive2" {
  name                = "someIPrange"
  redis_cache_name    = azurerm_redis_cache.example.name
  resource_group_name = azurerm_resource_group.example.name
  start_ip            = "0.0.0.0"
  end_ip              = "0.0.0.0"
}