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Drupal 7.x PHP Code Execution / Information Disclosure

Drupal 7.x PHP Code Execution / Information Disclosure
Posted Oct 18, 2012
Authored by Noam Rathaus, Heine Deelstra, Reginaldo Silva | Site drupal.org

Drupal versions prior to 7.16 suffer from arbitrary PHP code execution and information disclosure vulnerabilities. Version 6 is not affected.

tags | advisory, arbitrary, php, vulnerability, code execution, info disclosure
MD5 | f3fc03518b08d54c1170c2dc395905f6

Drupal 7.x PHP Code Execution / Information Disclosure

Change Mirror Download
View online: http://drupal.org/node/1815912

* Advisory ID: DRUPAL-SA-CORE-2012-003
* Project: Drupal core [1]
* Version: 7.x
* Date: 2012-October-17
* Security risk: Highly critical [2]
* Exploitable from: Remote
* Vulnerability: Information Disclosure, Arbitrary PHP code execution

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

Multiple vulnerabilities were discovered in Drupal core.

.... Arbitrary PHP code execution

A bug in the installer code was identified that allows an attacker to
re-install Drupal using an external database server under certain transient
conditions. This could allow the attacker to execute arbitrary PHP code on
the original server.

This vulnerability is mitigated by the fact that the re-installation can only
be successful if the site's settings.php file or sites directories are
writeable by or owned by the webserver user. Configuring the Drupal
installation to be owned by a different user than the webserver user (and not
to be writeable by the webserver user) is a recommended security best
practice [3]. However, in all cases the transient conditions expose
information to an attacker who accesses install.php, and therefore this
security update should be applied to all Drupal 7 sites.

.... Information disclosure - OpenID module

For sites using the core OpenID module, an information disclosure
vulnerability was identified that allows an attacker to read files on the
local filesystem by attempting to log in to the site using a malicious OpenID
server.

CVE: Requested

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

* Drupal core 7.x versions prior to 7.16.

Drupal 6 is not affected.

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

Install the latest version:

* If you use Drupal 7.x, upgrade to Drupal core 7.16 [4].

If you are unable to deploy the security release immediately, removing or
blocking access to install.php is a sufficient mitigation step for the
arbitrary PHP code execution vulnerability.

Also see the Drupal core [5] project page.

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

* The arbitrary PHP code execution vulnerability was reported by Heine
Deelstra [6] and Noam Rathaus [7] working with Beyond Security's
SecuriTeam Secure Disclosure Program. Heine Deelstra is also a member of
the Drupal Security Team.
* The information disclosure vulnerability in the OpenID module was reported
by Reginaldo Silva [8].

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

* The arbitrary PHP code execution vulnerability was fixed by Damien
Tournoud [9], David Rothstein [10], Peter Wolanin [11], and Károly
Négyesi [12], all members of the Drupal Security Team.
* The information disclosure vulnerability in the OpenID module was fixed by
Reginaldo Silva [13], Christian Schmidt [14], Vojtěch Kusý [15], and
Frédéric Marand [16], and by Peter Wolanin [17], David Rothstein [18],
Damien Tournoud [19], and Heine Deelstra [20] 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 [21].

Learn more about the Drupal Security team and their policies [22], writing
secure code for Drupal [23], and securing your site [24].


[1] http://drupal.org/project/drupal
[2] http://drupal.org/security-team/risk-levels
[3] http://drupal.org/node/244924
[4] http://drupal.org/node/1815904
[5] http://drupal.org/project/drupal
[6] http://drupal.org/user/17943
[7] http://drupal.org/user/2317662
[8] http://drupal.org/user/2305626
[9] http://drupal.org/user/22211
[10] http://drupal.org/user/124982
[11] http://drupal.org/user/49851
[12] http://drupal.org/user/9446
[13] http://drupal.org/user/2305626
[14] http://drupal.org/user/216078
[15] http://drupal.org/user/56154
[16] http://drupal.org/user/27985
[17] http://drupal.org/user/49851
[18] http://drupal.org/user/124982
[19] http://drupal.org/user/22211
[20] http://drupal.org/user/17943
[21] http://drupal.org/contact
[22] http://drupal.org/security-team
[23] http://drupal.org/writing-secure-code
[24] http://drupal.org/security/secure-configuration

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