full-disclosure - Re: LloydsTSB Bruteforce Possibility in Memorable Information

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Message-ID: <20070831201735.GA11181@lboro.ac.uk>
Date: Fri, 31 Aug 2007 21:17:35 +0100
From: A.L.M.Buxey@...ro.ac.uk
To: drumknott@...hmail.com
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: LloydsTSB Bruteforce Possibility in	Memorable
	Information

Hi,

> The issue lies in that if the user gets the memorable information 
> incorrect they are asked for the same character positions (e.g. 1, 
> 7 and 9 again). This continues forever, basically making the 
> memorable information pointless because it will not take much to 
> brute force it. 

not correct. after about 7 attempts the account is locked out at
the username/password part

> No attempts have been made to contact LloydsTSB regarding this 
> matter as I was unable to locate contact details and it is not that 
> severe.

http://www.lloydstsb.com/security.asp is a good starting point

anyway, LloydsTSB are moving to 2-factor authentication and most
of their customers should have their online backing upgraded
by the end of this year

http://www.vnunet.com/computing/news/2151425/lloyds-tsb-trial-wipes-online

alan

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