full-disclosure - Gmail, Yahoo and Hotmail’s CAPTCHA broken by spammers

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Message-ID: <b787ce30807030552g1fe74803sc3bd8e2ec405afc5@mail.gmail.com>
Date: Thu, 3 Jul 2008 15:52:20 +0300
From: "Dancho Danchev" <dancho.danchev@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Gmail, Yahoo and Hotmail’s CAPTCHA broken by spammers

Hello,

Breaking Gmail, Yahoo and Hotmail's CAPTCHAs, has been an urban legend
for over two years now, with do-it-yourself CAPTCHA breaking services,
and proprietary underground tools assisting spammers, phishers and
malware authors into registering hundreds of thousands of bogus
accounts for spamming and fraudulent purposes. This post intends to
make this official, by covering an underground service offering
thousands of already registered Gmail, Yahoo and Hotmail accounts for
sale, with new ones registered every second clearly indicating the
success rate of their CAPTCHA breaking capabilities at these services
:

http://blogs.zdnet.com/security/?p=1418

Regards
-- 
Dancho Danchev
Cyber Threats Analyst/Blogger
http://ddanchev.blogspot.com
http://blogs.zdnet.com/security
http://windowsecurity.com/Dancho_Danchev

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