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Date: Wed, 14 May 2014 23:08:02 -0400 (EDT)
From: cve-assign@...re.org
To: carnil@...ian.org
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com,
        security@...ngoproject.com
Subject: Re: CVE Reuest: Django: Malformed URLs from user input incorrectly validated

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> https://www.djangoproject.com/weblog/2014/may/14/security-releases-issued/

> It also fixes a second issue, for which a CVE is missing, quoting from
> the announcement:

>> Issue: Malformed URLs from user input incorrectly validated
>> The validation for redirects did not correctly validate some malformed
>> URLs, which are accepted by some browsers. This allows a user to be
>> redirected to an unsafe URL unexpectedly.
>>
>> Django relies on user input in some cases (e.g.
>> django.contrib.auth.views.login, django.contrib.comments, and i18n) to
>> redirect the user to an "on success" URL. The security checks for
>> these redirects (namely django.util.http.is_safe_url()) did not
>> correctly validate some malformed URLs, such as
>> http:\\\djangoproject.com, which are accepted by some browsers with
>> more liberal URL parsing.
>>
>> To remedy this, the validation in is_safe_url() has been tightened to
>> be able to handle and correctly validate these malformed URLs.

> https://github.com/django/django/commit/255449c1ee61c14778658caae8c430fa4d76afd6

> url = url.replace('\\', '/')
> 
> if url.startswith('///'):
>     return False
> 
> Forbid URLs like http:///example.com - with a scheme, but without a hostname.

Use CVE-2014-3730.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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