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www.waraxe.us Forum Index -> How to fix -> [waraxe-2004-SA#029] - Remote File Inclusion in PhpNuke
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[waraxe-2004-SA#029] - Remote File Inclusion in PhpNuke
PostPosted: Mon May 17, 2004 6:08 pm Reply with quote
waraxe
Site admin
Site admin
 
Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Let's assume we are working with PhpNuke 6.x - 7.3
Look at the beginning of the index.php and search for something like this:

Code:

require_once("mainfile.php");
$_SERVER['PHP_SELF'] = "modules.php";
$row = $db->sql_fetchrow($db->sql_query("SELECT main_module from ".$prefix."_main"));
$name = $row['main_module'];
$home = 1;


Now insert right after "require_once()" this new sentence:

Code:

$modpath = '';


So after patching the code it will look like this:

Code:

require_once("mainfile.php");
$modpath = '';
$_SERVER['PHP_SELF'] = "modules.php";
$row = $db->sql_fetchrow($db->sql_query("SELECT main_module from ".$prefix."_main"));
$name = $row['main_module'];
$home = 1;


In fact, the only thing you just did was the proper initializing of the variable $modpath. And that's enough to evade potential problems Cool
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PostPosted: Thu Jun 17, 2004 11:46 am Reply with quote
Jeruvy
Regular user
Regular user
 
Joined: Jun 17, 2004
Posts: 6




Hi waraxe,

My first post on the board, but you've certainly seen my feedback on your disclosures.

This patch breaks several websites.

The problem is the setting of

Code:
$modpath = '';


If this is set to
Code:
 $modpath = $nukeurl;


then it works again, but I have noticed bugs currently in $nukeurl. You may find some fun with these. $nukeurl can be configured with just about anything, and it's used as some important links (like home).


J.


Also wanted to say I'm a fan of full-disclosure, since I don't beleive PHP-Nuke would be anywhere nearly as secure today if it wasn't for full-disclosure.
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PostPosted: Thu Jun 17, 2004 3:40 pm Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




Thanks for feedback! And welcome to my forum!
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Better way of fixing it:
PostPosted: Sun Mar 05, 2006 12:48 am Reply with quote
dragon001
Beginner
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Joined: Mar 05, 2006
Posts: 1




There is a better way to fix this problem.
Just remove
$modpath
completely and use this:

define("modpath",<definition>);

I used this inside my index.php and modules.php
this is more secured, because an const. can't be overwritten.
Wink
just a little magic will do it
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Re: Better way of fixing it:
PostPosted: Wed Mar 08, 2006 2:40 am Reply with quote
waraxe
Site admin
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




dragon001 wrote:
There is a better way to fix this problem.
Just remove
$modpath
completely and use this:

define("modpath",<definition>);

I used this inside my index.php and modules.php
this is more secured, because an const. can't be overwritten.
Wink
just a little magic will do it


Yep, you are right, constants are good, because they can't be "poisoned" by attacker.
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[waraxe-2004-SA#029] - Remote File Inclusion in PhpNuke
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