Merge pull request rapid7#21425 from g0tmi1k/ftp_stat

ftp: Fix STAT due to unexpected response

Author: adfoster-r7

lib/msf/core/exploit/remote/ftp.rb

@@ -356,7 +356,7 @@ def recv_ftp_resp(nsock = self.sock)
         if not found_end
           resp << ln
           resp << "\r\n"
-          if ln.length > 3 and ln[3,1] == ' '
+          if ln.length > 3 and ln[3,1] == ' ' and ln[0,3] =~ /\A\d{3}\z/
             found_end = true
           end
         else