MyBB 1.4.3 my_post_key Disclosure Vulnerability

["nbbn () gmx net" <nbbn () gmx net>]

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#MyBB 1.4.3 my_post_key Disclosure Vulnerability by NBBN 
(http://nbbnsblog.co.cc)                                                                                              
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Vendor: http://mybboard.net
Date: November 25, 2008

These URLs contains "my_post_key". Moderators and admins use these 
sometimes, depending on what they want to do with a thread.
my_post_key is used to perform various actions and to prevent CSRF.

   
These pages shows the posts of the users. If some of these posts have 
pictures, the referrer will be transfered to the server of the images.
#####Vuln 
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http://localhost/mybb/moderation.php?action=mergeposts&tid=1&modtype=thread&my_post_key=[key]                                                                                      
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http://localhost/mybb/moderation.php?action=split&tid=1&modtype=thread&my_post_key=[key]                                                                                                   
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http://localhost/mybb/moderation.php?action=deleteposts&tid=1&modtype=thread&my_post_key=[key]                                                                                       
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Finally, an attacker has the postkey, and can perform some interesting 
moderator or administrator actions with csrf.