diff --git a/lib/msf/core/auxiliary/jtr.rb b/lib/msf/core/auxiliary/jtr.rb
index 6b9ddb322b3c..140fa94ee443 100644
--- a/lib/msf/core/auxiliary/jtr.rb
+++ b/lib/msf/core/auxiliary/jtr.rb
@@ -37,45 +37,57 @@ def initialize(info = {})
     autodetect_platform
   end
 
+  # @return [String] the run path instance variable if the platform is detectable, nil otherwise.
   def autodetect_platform
-    cpuinfo_base = ::File.join(Msf::Config.install_root, "data", "cpuinfo")
     return @run_path if @run_path
-
-    case ::RUBY_PLATFORM
-    when /mingw|cygwin|mswin/
-      data = `"#{cpuinfo_base}/cpuinfo.exe"` rescue nil
-      case data
-      when /sse2/
-        @run_path ||= "run.win32.sse2/john.exe"
-      when /mmx/
-        @run_path ||= "run.win32.mmx/john.exe"
-      else
-        @run_path ||= "run.win32.any/john.exe"
-      end
-
-    when /x86_64-linux/
-      ::FileUtils.chmod(0755, "#{cpuinfo_base}/cpuinfo.ia64.bin") rescue nil
-      data = `#{cpuinfo_base}/cpuinfo.ia64.bin` rescue nil
-      case data
-      when /mmx/
-        @run_path ||= "run.linux.x64.mmx/john"
-      else
-        @run_path ||= "run.linux.x86.any/john"
-      end
-
-    when /i[\d]86-linux/
-      ::FileUtils.chmod(0755, "#{cpuinfo_base}/cpuinfo.ia32.bin") rescue nil
-      data = `#{cpuinfo_base}/cpuinfo.ia32.bin` rescue nil
-      case data
-      when /sse2/
-        @run_path ||= "run.linux.x86.sse2/john"
-      when /mmx/
-        @run_path ||= "run.linux.x86.mmx/john"
-      else
-        @run_path ||= "run.linux.x86.any/john"
+    cpuinfo_base = ::File.join(Msf::Config.data_directory, "cpuinfo")
+    if File.directory?(cpuinfo_base)
+      data = nil
+
+      case ::RUBY_PLATFORM
+      when /mingw|cygwin|mswin/
+        fname = "#{cpuinfo_base}/cpuinfo.exe"
+        if File.exists?(fname) and File.executable?(fname)
+          data = %x{"#{fname}"} rescue nil
+        end
+        case data
+        when /sse2/
+          @run_path ||= "run.win32.sse2/john.exe"
+        when /mmx/
+          @run_path ||= "run.win32.mmx/john.exe"
+        else
+          @run_path ||= "run.win32.any/john.exe"
+        end
+      when /x86_64-linux/
+        fname = "#{cpuinfo_base}/cpuinfo.ia64.bin"
+        if File.exists? fname
+          ::FileUtils.chmod(0755, fname) rescue nil
+          data = %x{"#{fname}"} rescue nil
+        end
+        case data
+        when /mmx/
+          @run_path ||= "run.linux.x64.mmx/john"
+        else
+          @run_path ||= "run.linux.x86.any/john"
+        end
+      when /i[\d]86-linux/
+        fname = "#{cpuinfo_base}/cpuinfo.ia32.bin"
+        if File.exists? fname
+          ::FileUtils.chmod(0755, fname) rescue nil
+          data = %x{"#{fname}"} rescue nil
+        end
+        case data
+        when /sse2/
+          @run_path ||= "run.linux.x86.sse2/john"
+        when /mmx/
+          @run_path ||= "run.linux.x86.mmx/john"
+        else
+          @run_path ||= "run.linux.x86.any/john"
+        end
       end
     end
-    @run_path
+
+    return @run_path
   end
 
   def john_session_id