[Security-news] SA-CORE-2010-002 - Drupal core - Multiple vulnerabilities

[security-news at drupal.org]

  * Advisory ID: DRUPAL-SA-CORE-2010-002
  * Project: Drupal core
  * Version: 5.x, 6.x
  * Date: 2010-August-11
  * Security risk: Critical
  * Exploitable from: Remote
  * Vulnerability: Multiple vulnerabilities

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

Multiple vulnerabilities and weaknesses were discovered in Drupal.
.... OpenID authentication bypass

The OpenID module provides users the ability to login to sites using an
OpenID account. The OpenID module doesn't implement all the required
verifications from the OpenID 2.0 protocol and is vulnerable to a number of
attacks. Specifically: - OpenID should verify that a "openid.response_nonce"
has not already been used for an assertion by the OpenID provider - OpenID
should verify the value of openid.return_to as obtained from the OpenID
provider - OpenID must verify that all fields that are required to be signed
are signed These specification violations allow malicious sites to harvest
positive assertions from OpenID providers and use them on sites using the
OpenID module to obtain access to preexisting accounts bound to the harvested
OpenIDs. Intercepted assertions from OpenID providers can also be replayed
and used to obtain access to user accounts bound to the intercepted OpenIDs.
This issue affects Drupal 6.x only. A separate security announcement and
release [1] is published for the contributed OpenID module for Drupal 5.x.
.... File download access bypass

The upload module allows users to upload files and provides access checking
for file downloads. The module looks up files for download in the database
and serves them for download after access checking. However, it does not
account for the fact that certain database configurations will not consider
case differences in file names. If a malicious user uploads a file which only
differs in letter case, access will be granted for the earlier upload
regardless of actual file access to that. This issue affects Drupal 5.x and
6.x.
.... Comment unpublishing bypass

The comment module allows users to leave comments on content on the site. The
module supports unpublishing comments by privileged users. Users with the
"post comments without approval" permission however could craft a URL which
allows them to republish previously unpublished comments. This issue affects
Drupal 5.x and 6.x.
.... Actions cross site scripting

The actions feature combined with Drupal's trigger module allows users to
configure certain actions to happen when users register, content is
submitted, and so on; through a web based interface. Users with "administer
actions permission" can enter action descriptions and messages which are not
properly filtered on output. Users with content and taxonomy tag submission
permissions can create nodes and taxonomy terms which are not properly
sanitized for inclusion in action messages and inject arbitrary HTML and
script code into Drupal pages. Such a cross-site scripting attack may lead to
the malicious user gaining administrative access. Wikipedia has more
information about cross-site scripting [2] (XSS). This issue affects Drupal
6.x only.
-------- VERSIONS AFFECTED  
---------------------------------------------------

  * Drupal 6.x before version 6.18 or 6.19.
  * Drupal 5.x before version 5.23.

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

Install the latest version:
  * If you are running Drupal 6.x then upgrade to Drupal 6.18 [3] or Drupal
    6.19 [4].
  * If you are running Drupal 5.x then upgrade to Drupal 5.23 [5].

Drupal 5 will no longer be maintained when Drupal 7 is released [6].
Upgrading to Drupal 6 [7] is recommended. The security team starts a new
practice of releasing both a pure security update without other bugfixes and
a security update combined with other bug fixes and improvements. You can
choose to either only include the security update for an immediate fix (which
might require less quality assurance and testing) or more fixes and
improvements alongside the security fixes by choosing between Drupal 6.18 and
Drupal 6.19. Read the announcement [8] for more information.
-------- REPORTED BY  
---------------------------------------------------------

The OpenID authentication bypass issues were reported by Johnny Bufu [9],
Christian Schmidt [10] and Heine Deelstra [11] (*). The file download access
bypass was reported by Dylan Tack [12] (*). The comment unpublish bypass
issue was reported by Heine Deelstra [13] (*). The actions module cross site
scripting was reported by Justin Klein Keane [14] and Heine Deelstra [15]
(*). (*) Member of the Drupal security team.
-------- FIXED BY  
------------------------------------------------------------

The OpenID authentication issues were fixed by Christian Schmidt [16], Heine
Deelstra [17] (*) and Damien Tournoud [18] (*). The file download access
bypass was fixed by Dave Reid [19] (*) and Neil Drumm [20] (*). The comment
unpublish bypass issue was fixed by Heine Deelstra [21] (*). The actions
module cross site scripting was fixed by Justin Klein Keane [22] and Heine
Deelstra [23] (*). (*) Member of the Drupal security team.
-------- CONTACT  
-------------------------------------------------------------

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

[1] http://drupal.org/node/880480
[2] http://en.wikipedia.org/wiki/Cross-site_scripting
[3] http://ftp.drupal.org/files/projects/drupal-6.18.tar.gz
[4] http://ftp.drupal.org/files/projects/drupal-6.19.tar.gz
[5] http://ftp.drupal.org/files/projects/drupal-5.23.tar.gz
[6] http://drupal.org/node/725382
[7] http://drupal.org/upgrade
[8] http://drupal.org/drupal-6.19
[9] http://drupal.org/user/226462
[10] http://drupal.org/user/216078
[11] http://drupal.org/user/17943
[12] http://drupal.org/user/96647
[13] http://drupal.org/user/17943
[14] http://drupal.org/user/302225
[15] http://drupal.org/user/17943
[16] http://drupal.org/user/216078
[17] http://drupal.org/user/17943
[18] http://drupal.org/user/22211
[19] http://drupal.org/user/53892
[20] http://drupal.org/user/3064
[21] http://drupal.org/user/17943
[22] http://drupal.org/user/302225
[23] http://drupal.org/user/17943