refresh sysinfo when explicitly requested on a session

lib/rex/post/meterpreter/extensions/stdapi/sys/config.rb

@@ -104,9 +104,9 @@ class Config
   #
   # Returns a hash of information about the remote computer.
   #
-  def sysinfo
+  def sysinfo(refresh = false)
     request  = Packet.create_request('stdapi_sys_config_sysinfo')
-    if @sysinfo.nil?
+    if @sysinfo.nil? || refresh
       response = client.send_request(request)
 
       @sysinfo = {

lib/rex/post/meterpreter/ui/console/command_dispatcher/stdapi/sys.rb

@@ -808,7 +808,7 @@ class Console::CommandDispatcher::Stdapi::Sys
   # Displays information about the remote system.
   #
   def cmd_sysinfo(*args)
-    info = client.sys.config.sysinfo
+    info = client.sys.config.sysinfo(:refresh)
     width = "Meterpreter".length
     info.keys.each { |k| width = k.length if k.length > width and info[k] }