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Re: Google Accounts Security Vulnerability
From: Gage Bystrom <themadichib0d () gmail com>
Date: Wed, 16 May 2012 01:55:54 -0700

I think what he was trying to say, and I'm not sure since I havnt tested
it, is that you can bypass the 2nd layer of authentication by logging into
IMAP. Cause normally if you try to login from a strange device Google
becomes highly suspicious and starts asking you questions(the 2nd layer)
and he's saying that if you have the first layer covered, you can use IMAP
to avoid the second.

I don't know for sure, I just think that's what he is trying to say
On May 16, 2012 1:51 AM, "Jason Hellenthal" <jhellenthal () dataix net> wrote:



On Tue, May 15, 2012 at 06:29:03PM -0700, Michael J. Gray wrote:
I’ll clarify a bit.



If you log on to your Google account from the website and it prompts you
for
additional security questions, you can circumvent this by simply checking
mail via POP or what have you and then it adds your IP address to the
list
of recognized addresses.


I don't know about anyone else, but I use two step verification with
specific application pass phrases that Google so graciously allows you
to do.

With that said... It is the two phase authentication I chose to turn on
due to the fact I have to access my mail through IMAPS.

One thing I think you may be entirely confused with is the "Allow
multiple logins" feature that you can turn off and achieve exactly what
you would expect to happen.


?????????????????????????????????????????????????????????????????????
What I don't understand is... You go to your web portal to reset your
password... "you do not know what your password is...!" how on earth
would you login to IMAP, POP whatever...! ?
?????????????????????????????????????????????????????????????????????

PS: Besides if someone was able to login to your IMAP I sincerely doubt
accessing your mail by the web will be on any one of the objective
lists. They already have your =INBOX... Do use two phase authentication
and do use application specific passwords for accessing your account.



From: Thor (Hammer of God) [mailto:thor () hammerofgod com]
Sent: Tuesday, May 15, 2012 12:33 PM
To: Mateus Felipe Tymburibá Ferreira
Cc: Jason Hellenthal; Michael J. Gray; full-disclosure () lists grok org uk
Subject: RE: [Full-disclosure] Google Accounts Security Vulnerability



Logging on to IMAP mail as one would be doing hundreds of times per day
is
not going to reset the web cookie.  If that is what the OP is reporting,
I
would have to question if his recollection is correct since, by that
logic,
the password reset feature would never be activated since any other IMAP
logon would clear it.



If the user logged in, and was presented with the questions as stated,
then
it probably cleared any requirement since he would have to accept that.
Unless he is saying that when presented with the questions he
purposefully
did not put them in and tried to logon to IMAP which I find odd.



Regardless, if you already know the username and password for the email,
it
doesn’t matter anyway no does it?  You could always get the mail via
IMAP or
POP or whatever options were configured in gmail.  There wouldn’t be any
need to go to the web interface in the first place.



Now that I know I’m not missing anything, I’ll just let this one die on
the
vine.





Description: Description: Description: Description: Description:
Description: Description: Description: Description: TimSig



Timothy “Thor”  Mullen

www.hammerofgod.com

Thor
<
http://www.amazon.com/Thors-Microsoft-Security-Bible-Collection/dp/15974957
27> ’s Microsoft Security Bible





From: Mateus Felipe Tymburibá Ferreira [mailto:mateustymbu () gmail com]
Sent: Tuesday, May 15, 2012 12:21 PM
To: Thor (Hammer of God)
Cc: Jason Hellenthal; Michael J. Gray; full-disclosure () lists grok org uk
Subject: Re: [Full-disclosure] Google Accounts Security Vulnerability



I'm just copying the original message's part that probably answer your
question (I did not test it...):

">From there, I attempted to log-in to my Google account with the same
username and password.

To my surprise, I was not presented with any questions to confirm my
identity.

This completes the steps required to bypass this account hijacking
counter-measure."


Mateus Felipe Tymburibá Ferreira, M. Sc. student at UFAM
<http://portal.ufam.edu.br>
  CISSP <https://www.isc2.org/cissp/default.aspx> , OSCP
<
http://www.offensive-security.com/information-security-certifications/oscp-
offensive-security-certified-professional/> , OSCE
<
http://www.offensive-security.com/information-security-certifications/osce-
offensive-security-certified-expert/> , OSWP
<
http://www.offensive-security.com/information-security-certifications/oswp-
offensive-security-wireless-professional/>

 <https://www.isc2.org/cissp/default.aspx>
<
http://www.offensive-security.com/information-security-certifications/oscp-
offensive-security-certified-professional/>
<
http://www.offensive-security.com/information-security-certifications/osce-
offensive-security-certified-expert/>
<
http://www.offensive-security.com/information-security-certifications/oswp-
offensive-security-wireless-professional/>




2012/5/15 Thor (Hammer of God) <thor () hammerofgod com>

I'm not sure I understand the issue here - the requirement for someone
"happening to come across your username and password" is a pretext.

Logging on to the web interface where you can change password and other
personal information as well as verify existing site cookies affords the
service the ability to check these sorts of things.  But you logged on
via
IMAP, which is its own service just like POP3 or SMTP.   These services
can't check where you are or for the existence of a cookie, so I'm not
really sure what your expectation is, or why this is being presented as
an
issue.   Am I missing something?

Timothy "Thor"  Mullen
www.hammerofgod.com
Thor's Microsoft Security Bible



-----Original Message-----
From: full-disclosure-bounces () lists grok org uk
[mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of Jason
Hellenthal
Sent: Saturday, May 12, 2012 9:32 AM
To: Michael J. Gray
Cc: full-disclosure () lists grok org uk
Subject: Re: [Full-disclosure] Google Accounts Security Vulnerability


LMFAO!

On Sat, May 12, 2012 at 04:22:30AM -0700, Michael J. Gray wrote:
Effective since May 1, 2012.

Products Affected: All Google account based services



Upon attempting to log-in to my Google account while away from home, I
was presented with a message that required me to confirm various
details about my account in order to ensure I was a legitimate user
and not just someone who came across my username and password. Unable
to remember what my phone number from 2004 was, I looked for a way
around
it.

The questions presented to me were:

    Complete the email address: a******g () gmail com

    Complete the phone number: (425) 4**-***7



Since this was presented to me, I was certain I had my username and
password correct.

From there, I simply went to check my email via IMAP at the new
location.

I was immediately granted access to my email inboxes with no trouble.



From there, I attempted to log-in to my Google account with the same
username and password.

To my surprise, I was not presented with any questions to confirm my
identity.

This completes the steps required to bypass this account hijacking
counter-measure.



This just goes to show that even the largest corporations that employ
teams of security experts, can also overlook very simple issues.


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 - (2^(N-1))

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/






--

 - (2^(N-1))

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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