[Full-disclosure] Using Twitter for Phishing Campaign / Spam / Followers?

[Reverse Skills <contact@xxxxxxxxxxxxxxxxx>]

Simple and easy way to get a list of email accounts used on Twitter.
For Phishing campaigns, custom Spam...

Twitter has been notified and I suppose someday be fixed if they think
there should be filtered.

When you create a new Twitter account, the form requesting a mailing
address. Twitter verify that the email account is not being used, but
does not check any user token or limit the usage (captcha/block).

https://twitter.com/signup -> http://twitter.com/users/email_available?email=

We just need to automate it with a simple script , ***Everything you
do will be your responsibility***
-------------------
#!/usr/bin/python
import sys, json, urllib2, os

f = 
urllib2.urlopen("http://twitter.com/users/email_available?email="+sys.argv[1])
data = json.load(f)
def valid()
..
Email has already been taken" in data ["msg"] <-- reply
..
-------------------

We just need a list of users to test.. for example :
http://twitter.com/about/employees  (don't be evil is just an
example!)
Parsing the name/nickname and testing the {user}@twitter.com a few
minutes later we have a list of ~ 400 valid internal email
*@twitter.com. An attacker could probably.. a brute force attack
(Google Apps), would send Phishing or try to exploit some browser bugs
or similar. #Aurora #Google. Most of these e-mail are internal, not
public..
There are also some that make you think they are used to such
A-Directory system users :
..
apache@xxxxxxxxxxx
root@xxxxxxxxxxx
mail@xxxxxxxxxxx
..

But, if you download a database Rockyou / Singles.org / Gawker /
Rootkit.com or just a typical dictionaries and domains will be quite
easy to get hold of a list of users large enough (*@hotmail.com,
*@gmail.com, etc).For example in my case I used to find user accounts
in a pentest of a company that used Twitter. But probably not a good
idea to allow unlimited access, a malicious user could use these user
lists for Spam or Phishing.

-- 
Security Researcher
http://twitter.com/revskills
--

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