# Web.config Exposure Detection Module

id: webconfig-exposure
info:
  name: Web.config Exposure
  author: sif
  severity: high
  description: Detects an exposed ASP.NET web.config that leaks connection strings and app settings
  tags: [aspnet, iis, web-config, connection-string, exposure, recon]

type: http

http:
  method: GET
  paths:
    - "{{BaseURL}}/web.config"

  matchers:
    - type: status
      status:
        - 200

    - type: word
      part: body
      words:
        - "<configuration"

    - type: word
      part: body
      condition: or
      words:
        - "<connectionStrings"
        - "<system.web"
        - "<system.webServer"
        - "<appSettings"

    # a docs page that embeds a raw web.config sample as an example trips both
    # matchers above with no real web.config present. suppress any response
    # that opens like an html document; a real web.config is a plain xml
    # document rooted at <configuration> and never carries html markup.
    - type: regex
      part: body
      negative: true
      regex:
        - '(?i)<(!doctype|html|head|title|body)[ >]'

  extractors:
    - type: regex
      name: connection_string
      part: body
      regex:
        - 'connectionString="([^"]+)"'
      group: 1