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mybb-disclose.txt

mybb-disclose.txt
Posted Nov 25, 2008
Authored by NBBN

MyBB versions 1.4.3 suffers from a disclosure vulnerability relating to my_post_key that allows for cross site request forgery attacks.

tags | exploit, info disclosure, csrf
SHA-256 | bbd51fd8de68880f401879ce82e52bce95c0b71beebf2e4ab4daf8aa6e7816af

mybb-disclose.txt

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##################################################################################
#MyBB 1.4.3 my_post_key Disclosure Vulnerability by NBBN
(http://nbbnsblog.co.cc)
#
##################################################################################

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
URLs#################################################################################
http://localhost/mybb/moderation.php?action=mergeposts&tid=1&modtype=thread&my_post_key=[key]
#
http://localhost/mybb/moderation.php?action=split&tid=1&modtype=thread&my_post_key=[key]
#
http://localhost/mybb/moderation.php?action=deleteposts&tid=1&modtype=thread&my_post_key=[key]
#
############################################################################################



Finally, an attacker has the postkey, and can perform some interesting
moderator or administrator actions with csrf.
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