Ispravljena su tri sigurnosna propusta u radu Drupala. Propusti su posljedica: XSRF ranjivosti kod Aggregator modula, nepravilne implementacije razmjene atributa (AX) kod OpenID-a i pogreške File modula kod korištenja privatnih datoteka. Napadaču je omogućeno izvođenje DoS napada, pristup i izmjena osjetljivih informacija. Savjetuje se primjena izdanih nadogradnji.

* Advisory ID: DRUPAL-SA-CORE-2012-001
* Project: Drupal core [1]
* Version: 6.x, 7.x
* Date: 2012-February-01
* Security risk: Moderately critical [2]
* Exploitable from: Remote
* Vulnerability: Access bypass, Cross Site Request Forgery, Multiple
vulnerabilities

-------- DESCRIPTION
---------------------------------------------------------

.... Cross Site Request Forgery vulnerability in Aggregator module

CVE: CVE-2012-0826
An XSRF vulnerability can force an aggregator feed to update. Since some
services are rate-limited (e.g. Twitter limits requests to 150 per hour) this
could lead to a denial of service.

This issue affects Drupal 6.x and 7.x.

.... OpenID not verifying signed attributes in SREG and AX

CVE: CVE-2012-0825
A group of security researchers identified a flaw in how some OpenID relying
parties implement Attribute Exchange (AX). Not verifying that attributes
being passed through AX have been signed could allow an attacker to modify
users' information.

This issue affects Drupal 6.x and 7.x.

.... Access bypass in File module

CVE: CVE-2012-0827
When using private files in combination with certain field access modules,
the File module will allow users to download the file even if they do not
have access to view the field it was attached to.

This issue affects Drupal 7.x only.

-------- VERSIONS AFFECTED
---------------------------------------------------

* Drupal 6.x core prior to 6.23.
* Drupal 7.x core prior to 7.11.

-------- SOLUTION
------------------------------------------------------------

Install the latest version:

* If you use Drupal 6.x upgrade to 6.23 [3]
* If you use Drupal 7.x upgrade to 7.11 [4]

See also the Drupal core [5] project page.

-------- REPORTED BY
---------------------------------------------------------

* The Aggregator module CSRF vulnerability was reported by Dylan Tack [6] of
the Drupal Security Team.
* The OpenID vulnerability was reported by Rui Wang, Shuo Chen and Xiao Feng
Wang [7].
* The File module access bypass issue was reported by David Rothstein [8] of
the Drupal Security Team, and by Sascha Grossenbacher [9].

-------- FIXED BY
------------------------------------------------------------

* Aggregator CSRF issue fixed by Dave Reid [10] of the Drupal Security Team
* OpenID issue fixed by Vojtech Kusy [11] and Christian Schmidt [12]
* The File module access bypass issue was fixed by David Rothstein [13] of
the Drupal Security Team, Sascha Grossenbacher [14], and Derek Wright [15]
of the Drupal Security Team.

-------- CONTACT AND MORE INFORMATION
----------------------------------------

The Drupal security team can be reached at security at drupal.org or via the
contact form at http://drupal.org/contact [16].

Learn more about the Drupal Security team and their policies [17], writing
secure code for Drupal [18], and securing your site [19].


[1] http://drupal.org/project/drupal
[2] http://drupal.org/security-team/risk-levels
[3] http://drupal.org/node/1425082
[4] http://drupal.org/node/1425092
[5] http://drupal.org/project/drupal
[6] http://drupal.org/user/96647
[7] http://openid.net/2011/05/05/attribute-exchange-security-alert/
[8] http://drupal.org/user/124982
[9] http://drupal.org/user/214652
[10] http://drupal.org/user/53892
[11] http://drupal.org/user/56154
[12] http://drupal.org/user/216078
[13] http://drupal.org/user/124982
[14] http://drupal.org/user/214652
[15] http://drupal.org/user/46549
[16] http://drupal.org/contact
[17] http://drupal.org/security-team
[18] http://drupal.org/writing-secure-code
[19] http://drupal.org/security/secure-configuration

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