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www.waraxe.us Forum Index -> Newbies corner -> phpbb 2.0.21: A PoC exploit to change Avatar file location
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phpbb 2.0.21: A PoC exploit to change Avatar file location
PostPosted: Sat Aug 23, 2008 1:21 pm Reply with quote
c2java
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Joined: Aug 17, 2008
Posts: 8




http://www.milw0rm.com/exploits/2348
im asking for a detailed explanation on how to use this thing. im trying to run it with these arguments selecting my own 2.0.21 phpbb forum as the victim:
perl phpbb.pl localhost/forum [actual admin name] [actual admin password] images/avatars/shell.php
it "thinks" for a sec and then just ends without any output and the avatar location doesnt change. what the hell am i doing wrong, how do i do it right and do i really have to put in the forum's admin's name and his password in order to make it work, coz i dont think if ill find the exploit very practical then..
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PostPosted: Sat Aug 23, 2008 4:18 pm Reply with quote
lenny
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Joined: May 15, 2008
Posts: 275




I belive that it should be:
Quote:
perl phpbb.pl localhost/forum [admin password] images/avatars/shell.php


Thats just from first glance Smile

Try it and get back to us Smile
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PostPosted: Sat Aug 23, 2008 6:42 pm Reply with quote
c2java
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nope, i dont know perl but i can still tell that you need 5 arguments (although i dont use the 5th as you might have noticed coz it gives me errors, i'd like some1 to lighten my mind on this one, i use [d<DEBUG>] as the last argument (just like it says in the exploit's code) and it gives me "The system cannot find the file specified.").
but thanks for the reply anyway ^^
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PostPosted: Sun Aug 24, 2008 12:05 am Reply with quote
gibbocool
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Im pretty sure you need to be admin.

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PostPosted: Sun Aug 24, 2008 8:39 am Reply with quote
c2java
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could be, but as i said i am entering admin user and pass and it still doesnt work
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PostPosted: Sun Aug 24, 2008 3:09 pm Reply with quote
lenny
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... If you have access to the admin account, why not just change the path manually... and also, what is the aim of this attack if you alrady have control?
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PostPosted: Sun Aug 24, 2008 5:31 pm Reply with quote
c2java
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im trying the exploit on my own forum before the actual attack
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PostPosted: Sun Aug 24, 2008 7:38 pm Reply with quote
lenny
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Ok, upon closer inspection you were right - both admin username and password need to be supplied. The avatar location isn't supposed to change I believe - I think that it allows the upload of any file type to any directory through the profile page. The exploit simply adds the poison null byte to the end of the avatar path, possibly breaking any validation attempts by phpBB allowing you to upload malicious files.

Admittedly, the exploit is not very well documented, and no white-paper is provided...
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PostPosted: Mon Aug 25, 2008 6:17 am Reply with quote
c2java
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thanks alot but i still cant quite grasp how to choose where to upload the file..
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PostPosted: Mon Aug 25, 2008 10:29 am Reply with quote
lenny
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Ok this is getting a little tedious Razz
I (to be absolutley honest) dont know. I get the idea behind the exploit, but it goes in no detail how to actually comprimise the system. From what I can see, all this does is add %00 to the avatar url - a simple poison null byte. Im pretty sure this can be exploited, but due to the lack of information provided by the exploit author I cannot do any more easily.

Edit: Ok, so I am doing a little more research - Ill post if i find anything.
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PostPosted: Tue Aug 26, 2008 6:29 pm Reply with quote
c2java
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thanks, i appreciate it alot
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phpbb 2.0.21: A PoC exploit to change Avatar file location
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