Updates plugin version detection via Readme

app/finders/plugin_version/readme.rb

@@ -9,9 +9,10 @@ module WPScan
         def aggressive(_opts = {})
           found_by_msg = 'Readme - %s (Aggressive Detection)'
 
+          # The target(plugin)#readme_url can't be used directly here
+          # as if the --detection-mode is passive, it will always return nil
           Model::WpItem::READMES.each do |file|
-            url = target.url(file)
-            res = Browser.get(url)
+            res = target.head_and_get(file)
 
             next unless res.code == 200 && !(numbers = version_numbers(res.body)).empty?
 
@@ -20,10 +21,11 @@ module WPScan
                 e[0],
                 found_by: format(found_by_msg, e[1]),
                 confidence: e[2],
-                interesting_entries: [url]
+                interesting_entries: [res.effective_url]
               )
             end
           end
+
           nil
         end
 

spec/app/finders/plugin_version/readme_spec.rb

@@ -24,17 +24,23 @@ describe WPScan::Finders::PluginVersion::Readme do
   end
 
   describe '#aggressive' do
-    before { expect(target).to receive(:content_dir).and_return('wp-content') }
+    before do
+      expect(target).to receive(:content_dir).and_return('wp-content')
+
+      allow(target).to receive(:head_or_get_params).and_return(method: :head)
+
+      stub_request(:head, /.*/).to_return(status: 404)
+      stub_request(:head, readme_url).to_return(status: 200)
+    end
+
+    let(:readme_url) { plugin.url(WPScan::Model::WpItem::READMES.sample) }
 
     after do
-      stub_request(:get, /.*/).to_return(status: 404)
       stub_request(:get, readme_url).to_return(body: File.read(fixtures.join(@file)))
 
       expect(finder.aggressive).to eql @expected
     end
 
-    let(:readme_url) { plugin.url(WPScan::Model::WpItem::READMES.sample) }
-
     context 'when no version' do
       it 'returns nil' do
         @file     = 'no_version.txt'