Added incorrect creds check

Author: jheysel-r7

modules/exploits/linux/http/pivotx_index_php_overwrite.rb

@@ -90,7 +90,8 @@ def login
       'keep_cookies' => true
     })
 
-    fail_with(Failure::NoAccess, 'Login failed, probably incorrect credentials') unless (res&.code == 200 || res&.code == 302) && res.get_cookies =~ /pivotxsession=([a-zA-Z0-9]+);/
+    fail_with(Failure::NoAccess, 'Login failed, incorrect username/password') if res&.get_html_document&.at("//script[contains(., 'Incorrect username/password')]")
+    fail_with(Failure::Unknown, 'Login failed, unable to pivotxsession cookie') unless (res&.code == 200 || res&.code == 302) && res.get_cookies =~ /pivotxsession=([a-zA-Z0-9]+);/
 
     @csrf_token = Regexp.last_match(1)
   end