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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...can can 'unknown username' messages be prevented - as it aides hackers in finding out usernames
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5/28/2009 6:12 AM
 
mark richardson

Joined: 7/30/2007
Posts: 501

thanks for your posts.

I have changed the "user name does not exist" to "There was a problem with your request".
(in Language Editor > Authentication > Login)

I realise a savvy attacker will work out that the difference between successful attempts and unsuccessful attempts, due to the confirmation message of a successful attempt. But, at least it's not as blatantly obvious that the username does not exist.

I just wondered if there was a setting to limit 'forgotten username' attempts.
 
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5/28/2009 9:33 AM
 
cathal connolly


cathal connolly's Avatar

www.cathal.co.uk
Joined: 4/9/2003
Posts: 9676

FAIR TRADE Football (we want fairness 4 fans) wrote
 

I am on version 4.9.3

To find usernames - it can be done via the 'forgot password' section, this allows unlimited attempts.

If someone had a big site with 1000 users, attackers could have unlimited attempts to find 1000 usernames. Password attempts may be limited to 5 but this would equate to 5000 attempts in total.

 

you can configure a number of these settings already in the web.config i.e. use enablePasswordRetrieval to disable the forgot passwords dialog, use passwordAttemptThreshold to set the limit of password attempts, and passwordAttemptWindow to set the time these attempts are allowed in.

As I mentioned in my other post, please forward any security concerns to security@dotnetnuke.com .

Cathal

Buy the new Professional DNN7: Open Source .NET CMS Platform book Amazon US
 
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5/28/2009 9:57 AM
 
mark richardson

Joined: 7/30/2007
Posts: 501

thanks,

will do.

 
 
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