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Category:   Device (Firewall)  >   ZyWALL Vendors:   ZyXEL Communications Corp.
ZyWALL Input Validation Hole Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1020000
SecurityTracker URL:  http://securitytracker.com/id/1020000
CVE Reference:   CVE-2008-2167   (Links to External Site)
Updated:  May 19 2008
Original Entry Date:  May 9 2008
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): ZYWall 100
Description:   A vulnerability was reported in ZyWALL. A remote user can conduct cross-site scripting attacks.

The device does not properly filter HTML code from user-supplied input in the HTTP Referer header parameter before displaying the input. A remote user can create a specially crafted request 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 ZyWALL 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.

Deniz Cevik 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 ZyWALL 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:  www.zyxel.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Thu, 8 May 2008 18:12:45 +0300
Subject:  ZYWALL Referer Header XSS Vulnerability

Affected Software/Device: Zyxel ZYWall 100

Vulnerability: Cross Site Scripting

Risk: Low

Description: The ZyWALL 100 is designed to act as a secure gateway via
xDSL/Cable modems or broadband routers for small to medium size
companies. The ZyWALL 100 features an ICSA certified firewall, IPSec VPN
capability, MultiNAT, web pages content filtering and an embedded web
configurator for easy configuration and management.

ZyWALL web based management interface utilizes referer header for
serving 404 Error pages. The vulnerability can be exploited by
requesting a non-existing web page with a specially crafted referer
header. As the application does not properly sanitize the data contained
in the referer header, desired script code can be run on client browser.

Sample Request:

GET /blah.htm HTTP/1.1
Host: www.site.com
Referer: blaaaa"><script>alert(12345)</script>aaaah.htm


Deniz CEVIK
www.intellectpro.com.tr


 
 


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