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IT Security and Insecurity Portal |
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Cross Site Scripting in PHP Nuke 7.7 |
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 Posted: Thu Jul 14, 2005 11:22 am |
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| engagedb |
| Regular user |
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| Joined: Jul 10, 2005 |
| Posts: 7 |
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I'd say this is a low risk.
Anyways. First the link in question:
modules.php?name=Your_Account&redirect=>[XSS HERE]<b&mode=>[AND HERE]<b
Although modules.php seems to point to Your_Account, I found this bug within
/forums/profiles.php.
| Code: |
if ( !$userdata['session_logged_in'] && $mode == 'editprofile' )
{
$header_location = ( @preg_match("/Microsoft|WebSTAR|Xitami/", $_SERVER["SERVER_SOFTWARE"]) ) ? "Refresh: 0; URL=" : "Location: ";
header($header_location . append_sid("login.$phpEx?redirect=profile.$phpEx&mode=editprofile", true));
exit;
}
@include("includes/usercp_register.php");
exit;
}
else if ( $mode == 'confirm' )
{
// Visual Confirmation
if ( $userdata['session_logged_in'] )
{
exit;
}
exit;
}
else if ( $mode == 'sendpassword' )
{
@include('includes/usercp_sendpasswd.'.$phpEx);
exit;
}
else if ( $mode == 'activate' )
{
@include('includes/usercp_activate.'.$phpEx);
exit;
}
else if ( $mode == 'email' )
{
@include('includes/usercp_email.'.$phpEx);
exit;
}
}
redirect(append_sid("index.$phpEx", true));
?>
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Where to start? Mode= .. This part has 1 problem. It shows what to do if mode=editprofile, or mode=email
but it fails to address anything else..
The Redirect= problem, well, Thats one I'm still trying to pinpoint. I'm concerned that the Redirect= will be found in every area of phpNuke due to the option in Admin to force a user to register/be logged in to view the file. Thus resulting in "redirect" to the your_account (or possibly other areas)
From my finds I can't really put anything dangerous into it, IE: SQL queries, PHP Code, etc
try it on your test site, pop in the link, and then click view source
now click view source
<input type="hidden" name="redirect" value=>[XSS HERE]<b>
<input type="hidden" name="mode" value=>[AND HERE]<b>
If anyone finds a fix before me, lol, please post it here so we can all utilize it, thanks.
-Special thanks to WarAxe for his assistance. Cya's |
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| Posted: Thu Jul 14, 2005 12:12 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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I have done some research about this and can confirm existence of the 2 XSS cases - in variables "redirect" and "mode".
Some prominent phpnuke sites, still unpatched:
http://www.nukescripts.net
http://phpnuke.org
http://www.nukefixes.com
As XSS exists on those sites, it is obvious, that this XSS case is widespread in all the net.
How to fix? Open the "modules/Your_Account/index.php" and find this in beginning:
| Code: |
if (!defined('MODULE_FILE')) {
die ("You can't access this file directly...");
}
require_once("mainfile.php");
$module_name = basename(dirname(__FILE__));
get_lang($module_name);
$userpage = 1;
include("modules/$module_name/navbar.php");
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Now just add some restrictive sanitizer code:
| Code: |
if (!defined('MODULE_FILE')) {
die ("You can't access this file directly...");
}
require_once("mainfile.php");
$module_name = basename(dirname(__FILE__));
get_lang($module_name);
$userpage = 1;
$redirect = preg_replace("/[^a-zA-Z0-9_]/",'',$_REQUEST['redirect']);
$mode = preg_replace("/[^a-zA-Z]/",'',$_REQUEST['mode']);
include("modules/$module_name/navbar.php");
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This should do the trick  |
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| Posted: Thu Jul 14, 2005 12:21 pm |
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| engagedb |
| Regular user |
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| Joined: Jul 10, 2005 |
| Posts: 7 |
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Theoretically that should work for all of the redirect bugs , not just pages redirecting to Your Account, correct?
I'm gonna put it into my test page and give it a shot , thanks m8 |
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| Posted: Fri Jul 22, 2005 3:53 am |
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| kidron |
| Beginner |
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| Joined: Jul 22, 2005 |
| Posts: 4 |
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| engagedb wrote: | Theoretically that should work for all of the redirect bugs , not just pages redirecting to Your Account, correct?
I'm gonna put it into my test page and give it a shot , thanks m8 |
please give us a shout if you find something  |
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