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We've had Limit Login Attempts installed for some weeks now, and the number of brute force attempts occurring on wp-admin/wp-login is pretty amazing. At first the attempts were all with the username "Admin," which doesn't exist on our site, so I considered it an annoyance but not much of a threat. However, now we're seeing lockouts occurring with other named admin user accounts and I'm completely at a loss of understanding for how the attackers are deducing the usernames of these accounts.

No content on our site is authored by anyone in particular and I can't find any other location on our site where these usernames are publicly published.

Any idea as to how usernames might be discoverable?

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2 Answers

up vote 8 down vote accepted

If you have pretty permalinks enabled WordPress will redirect all calls to /?author=1 to the author archive with the user name, eg.: /author/bob/. And then the visitor will know the author name.

Use Login Lockdown, that plugin does not reset accounts, it will block IP addresses.

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"Limit Login Attempts blocks an Internet address from making further attempts after a specified limit on retries is reached... " I am not affiliated with the plugin but do use it and that is exactly what it appears to do. The IP address associated with a failed login is logged and the address is blocked if a configurable maximum attempt limit is reached. Also, "Login Lockdown" hasn't been updated in two years. –  s_ha_dum Feb 2 '13 at 1:08
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Clever buggers. I think I am just going to redirect requests to /?author=. Sound reasonable? Something like:

add_action( 'template_redirect', 'my_author_redirect' );
function my_author_redirect() {
    if ( is_author() ) {
        wp_redirect( get_bloginfo( 'url' ), 301 );
        exit;
    }       
}
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That would be Security by Obscurity. It is better to configure your site so that it doesn't matter if a visitor knows your user name. The LLA plugins is breaking this essential rule; don't go the same way. –  toscho Sep 25 '12 at 16:36
    
@toscho can you elaborate? I don't think the LLA plugin does completely break this rule. It works by initiating an IP lockout after x failed login attempts. It does work even when an attacker knows the user name. What else can be done? Password protect wp-admin...whitelist only certain ip's with .htaccess...make sure all users have strong passwords...? Regardless of any/all of the above, I still like the above redirect option for belt-and-suspenders protection. –  user20814 Sep 25 '12 at 17:14
    
Maybe I remember this wrong. I had the impression that a certain user will be locked out after some failed log-in attempts. –  toscho Sep 25 '12 at 18:33
    
Actually, crap you're right. I misspoke. The lockout is based on user. –  user20814 Sep 25 '12 at 20:19
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