From 85b09a162a66e78a462d067cf706bbd5ed1610f8 Mon Sep 17 00:00:00 2001
From: Carter Brainerd <cbawsome77@gmail.com>
Date: Tue, 17 Apr 2018 12:09:46 -0400
Subject: [PATCH] Add some efficiency improvements

---
 lib/msf/core/post/linux/system.rb | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/msf/core/post/linux/system.rb b/lib/msf/core/post/linux/system.rb
index 6caffceea1..aca05c8391 100644
--- a/lib/msf/core/post/linux/system.rb
+++ b/lib/msf/core/post/linux/system.rb
@@ -110,11 +110,9 @@ module System
   def get_listening_services(portsonly = false)
     services = {}
     begin
-      full = cmd_exec('netstat -tulpn')
+      full = cmd_exec('netstat -tulpn').to_s
       raise "You must be root to get listening ports" if full.include? '(No info could be read'
-      lines = full.split("\n").size
-      cmd = "netstat -tulpn | tail -n #{lines - 2}"
-      full = cmd_exec(cmd)
+      full = full[2..-1]
       full.delete!(':') # Only happens when getting services
 
       if portsonly