An information leak occurs on Apache based web servers whenever the UserDir module is enabled. The vulnerability allows an external attacker to enumerate existing accounts by requesting access to their home directory and monitoring the response.
1) Disable this feature by changing 'UserDir public_html' (or whatever) to 'UserDir disabled'. Or 2) Use a RedirectMatch rewrite rule under Apache -- this works even if there is no such entry in the password file, e.g.: RedirectMatch ^/~(.*)$ http://my-target-webserver.somewhere.org/$1 Or 3) Add into httpd.conf: ErrorDocument 404 http://localhost/sample.html ErrorDocument 403 http://localhost/sample.html (NOTE: You need to use a FQDN inside the URL for it to work properly). Additional Information: http://www.securiteam.com/unixfocus/5WP0C1F5FI.html