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Date: Tue, 23 Jul 2013 16:33:06 +0200
From: Salvatore Bonaccorso <>
Subject: Re: CVE Request: Django: Account enumeration through
 timing attack in password verification in django.contrib.auth


On Mon, Jul 22, 2013 at 05:04:44PM +0200, Salvatore Bonaccorso wrote:
> Hi
> Cc'ing
> From [1] in Django accounts can be enumerated trough timing attacks:
> > When attempting to authenticate using django.contrib.auth, if a user does not
> > exist the authenticate() function returns None nearly instantaneously, while
> > when a user exists it takes much longer as the attempted password gets hashed
> > and compared with the stored password. This allows for an attacker to infer
> > whether or not a given account exists based upon the response time of an
> > authentication attempt.  This can be seen much more clearly when the number of
> > rounds on the password hasher is set to something high like 100000.
>  [1]
> A proposed patch is at [2] but not yet a commit in upstream git repository.
>  [2]
> Does this needs a CVE asignment?

Only a update: this was now fixed in [1] in master branch, and in [2]
as backport for 1.6.x.



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