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Date: Tue, 24 Jun 2014 22:03:55 +0200
From: R D <rd.seclists@...il.com>
To: fulldisclosure@...lists.org
Subject: Re: [FD] Session Hijack Vulnerabilty on ebays german want ad?

Hi all,
Yes Christian, this might be a security vulnerability, but it's an edge
case.

To me, the problem here is the difference between the user expectation and
what really happens.
A clear case of a similar vuln is when you log out of a website and what
the website actually does is just deleting the cookies on your browser, but
not invalidating the session Id server-side (so the session is still valid
for any attacker holding onto the cookie).
In your case, you click the "forgot password" button. One might say you
have no expectation of this killing any other session you might have on the
application. But in reality, the password reset function might be used in
the case of a (suspected) account compromise; either you cannot login
because an attacker has changed your password, or you can't be bothered to
log in to change your password but you suspect someone might have gained
access to your account. In both cases this is clearly not the intended
behaviour as the attacker remains in control of your account.

You might want to try changing your password while logged in and see if
when the password is changed this way, the other sessions are invalidated.

Regards,
--rob'

On Mon, Jun 23, 2014 at 9:39 PM, uname -a <sec.list@....net> wrote:

> Yes it is a vector.
> Imagin the following:
> you go to a "friend". there you log in to your site.
> before you leave, you forgotten to logout.
> at home you change your password.
> but your friend can still use your account.
>
> greetings
>
> Am 23.06.2014 20:21, schrieb Christian K.:
> > Hi,
> >
> > i have a question if this is an attack vector (website is german want ad
> > branch from ebay kleinanzeigen.ebay.de prob. english site affected too):
> >
> > On Computer A the browser (FF) has an open tab with the site where, when
> > visited, user A is always signed on (because the specific site is the
> user
> > panel).
> >
> > On Computer B user A wants to log into his account, but forgot his
> > password. He successfully changed his password using the "forgot
> password"
> > button and was able to log in.
> >
> > Then user A moves from Computer B to Computer A (which was off at the
> time
> > user A was at Computer B) and starts its browser where he realizes that
> he
> > is still logged into his account on the site without any password
> > confirmation.
> >
> > As this happend to me, the question is: is this an attack vector (I
> assume
> > it is) and how can I as a user protect myself? Am not really into
> security
> > engineering (just non-sec-related software engineering...), so forgive my
> > dumbness!
> >
> > Thanks.
> >
> >
> > C.
> >
> > _______________________________________________
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> >
>
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