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Message-ID: <20130723221539.GH11432@kludge.henri.nerv.fi>
Date: Wed, 24 Jul 2013 01:15:39 +0300
From: Henri Salo <henri@...v.fi>
To: oss-security@...ts.openwall.com
Cc: security@...ngoproject.com, Salvatore Bonaccorso <carnil@...ian.org>
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 security@...ngoproject.com
>
> 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] https://code.djangoproject.com/ticket/20760
>
> A proposed patch is at [2] but not yet a commit in upstream git repository.
>
> [2] https://code.djangoproject.com/attachment/ticket/20760/20760_fix_hash_once.diff
>
> Does this needs a CVE asignment?
>
> Regards,
> Salvatore
Please see comments from aaugustin
https://code.djangoproject.com/ticket/20760#comment:23
This is exemplary case of CWE-208 and similar issues have received CVEs.
---
Henri Salo
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