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win-iisadmin

Windows IIS admin

For extensive reading see the SSL Labs document page

[IIS BASIC HARDENING CHECKLIST]  

  • Apply common CVE registry changes 🚧👷‍♂️🚧
  • Ensure web content is on non-system partition
  • Ensure ‘host headers’ are on all sites 🎉
  • Ensure ‘directory browsing’ is set to disabled
  • Ensure ‘application pool identity’ is configured for all application pools
  • Ensure ‘unique application pools’ is set for sites
  • Ensure ‘application pool identity’ is configured for all application pools
  • Ensure WebDav feature is disabled Ensure HTTP is redirected to HTTPS
  • Request Filtering and Other Restriction Modules
  • Ensure ‘maxAllowedContentLength’ is configured
  • Ensure ‘maxURL request filter’ is configured
  • Ensure ‘MaxQueryString request filter’ is configured
  • Ensure non-ASCII characters in URLs are not allowed
  • Ensure Double-Encoded requests will be rejected
  • Ensure ‘HTTP Trace Method’ is disabled
  • Ensure Unlisted File Extensions are not allowed
  • Ensure Handler is not granted Write and Script/Execute
  • Ensure ‘notListedCgisAllowed’ is set to false
  • Ensure ‘Dynamic IP Address Restrictions’ is enabled
  • IIS Logging Recommendations
  • Ensure Default IIS web log location is moved
  • Ensure Advanced IIS logging is enabled
  • Ensure ‘ETW Logging’ is enabled
  • Transport Encryption 🚧👷‍♂️🚧
    • Ensure HSTS Header is set
    • Ensure SSLv2 is Disabled
    • Ensure SSLv3 is Disabled
    • Ensure TLS 1.0 is Disabled
    • Ensure TLS 1.1 is Disabled
    • Ensure TLS 1.2 is Enabled
    • Ensure NULL Cipher Suites is Disabled
    • Ensure DES Cipher Suites is Disabled
    • Ensure RC4 Cipher Suites is Disabled
    • Ensure AES 128/128 Cipher Suite is Disabled
    • Ensure AES 256/256 Cipher Suite is Enabled
    • Ensure TLS Cipher Suite ordering is Configured

[ENSURE HOST HEADERS ON ALL SITES]

Update all HTTP host headers as they may respond with server details

CVE-2000-0649 FIX - Microsoft IIS Internal IP Address Disclosure Vulnerability

  1. Open CMD.exe as admin in the IIS folder
  2. Alternatively, navigate into the default IIS folder

cd C:\Windows\System32\inetsrv

  1. Update the HTTP head by typing the below, replacing HOSTNAME with the internet facing DNS:

appcmd.exe set config -section:system.webServer/serverRuntime /alternateHostName:”HOSTNAME” /commit:apphost

Validation Testing on Android

  1. Download Termux from the Android GooglePlay: https://play.google.com/store/apps/details?id=com.termux

  2. Open terminal and install the latest wget package by executing:

    pkg install wget

  3. Install the latest openssl pacakge

    pkg install openssl

  4. To open a TLS session

    openssl s_client -connect HOSTNAME:443

  5. Create an image request using HTTP 1.0 by executing:

    GET /image HTTP/1.0

  6. HTTP header should reply with a HOSTNAME (rather than the IP address)

  7. Optional: If testing with various protocols or phishing for HTTP responses, repeat steps 4-6 until satisfied

Validation Testing on iOS

  1. Download iSH Shell from the Apple AppStore: https://apps.apple.com/us/app/ish-shell/id1436902243

  2. Install the latest openssl pacakge

    apk add openssl

  3. To open a TLS session exexcute

    openssl s_client -connect HOSTNAME:443

  4. Create an image request using HTTP 1.0

    GET /image HTTP/1.0

  5. HTTP header should reply with a HOSTNAME (rather than the IP address)

  6. Optional: If testing with various protocols or phishing for HTTP responses, repeat steps 4-6 until satisfied

Validation Testing on from an external website

  1. Go to SSL Labs Server Test: https://www.ssllabs.com/ssltest/index.html
  2. Type in HOSTNAME and then Submit the request
  3. Allow time for the scans and simulations to complete
  4. Scroll down to HTTP Requests
  5. Check Location and confirm HOSTNAME is being sent instead of IP address

[TRANSPORT ENCRYPTION]

Update Windows IIS SCHANNEL and CIPHER SUITES to ensure secure encryption

SSL Rating Guide

WIP