Leverage check_version_from_custom_file in PR #5292

Change the 'check' code to leverage check_version_from_custom_file added to wordpress/version.rb by @FireFart in PR #5292

modules/exploits/unix/webapp/wp_revslider_upload_execute.rb

@@ -41,37 +41,8 @@ class Metasploit3 < Msf::Exploit::Remote
   end
 
   def check
-    fixed_version = '3.0.96'
-
-    # RevSlider doesn't have a readme.txt, look elsewhere
     release_log_url = normalize_uri(wordpress_url_plugins, 'revslider', 'release_log.txt')
-    vprint_status("#{peer} - Checking #{release_log_url}")
-    res = send_request_cgi(
-      'uri'    => release_log_url,
-      'method' => 'GET'
-    )
-
-    if res.nil? || res.code != 200
-      # No release_log.txt present for plugin
-      return Msf::Exploit::CheckCode::Unknown
-    end
-
-    if res.body
-      body = res.body.to_s
-      version = body[/(?:version)\s*([0-9a-z.-]+)/i, 1]
-    end
-
-    # Could not identify version number
-    return Msf::Exploit::CheckCode::Detected if version.nil?
-
-    vprint_status("#{peer} - Found version #{version}")
-
-    # Check to see if version older than fixed version
-    if Gem::Version.new(version) < Gem::Version.new(fixed_version)
-      return Msf::Exploit::CheckCode::Appears
-    else
-      return Msf::Exploit::CheckCode::Safe
-    end
+    check_version_from_custom_file(release_log_url, /^\s*(?:version)\s*(\d{1,2}\.\d{1,2}(?:\.\d{1,2})?).*$/mi, '3.0.96')
   end
 
   def exploit