The Image module in Drupal 7.x before 7.20 allows remote attackers to cause a denial of service (CPU and disk space consumption) via a large number of new derivative requests.

The version of Drupal installed on the remote server is 7.x prior to 7.20, and is affected by a flaw that may allow a remote denial of service. The issue is triggered during the handling of on-demand generation of image derivatives. This may allow a remote attacker to exhaust server disk space and cause the website to become unresponsive.

Multiple security issues was identified and fixed in drupal :

Drupal core's Image module allows for the on-demand generation of image derivatives. This capability can be abused by requesting a large number of new derivatives which can fill up the server disk space, and which can cause a very high CPU load. Either of these effects may lead to the site becoming unavailable or unresponsive (CVE-2013-0316).

Drupal's form API has built-in cross-site request forgery (CSRF) validation, and also allows any module to perform its own validation on the form. In certain common cases, form validation functions may execute unsafe operations (CVE-2013-6385).

Drupal core directly used the mt_rand() pseudorandom number generator for generating security related strings used in several core modules.
It was found that brute force tools could determine the seeds making these strings predictable under certain circumstances (CVE-2013-6386).

Image field descriptions are not properly sanitized before they are printed to HTML, thereby exposing a cross-site scripting vulnerability (CVE-2013-6387).

A cross-site scripting vulnerability was found in the Color module. A malicious attacker could trick an authenticated administrative user into visiting a page containing specific JavaScript that could lead to a reflected cross-site scripting attack via JavaScript execution in CSS (CVE-2013-6388).

The Overlay module displays administrative pages as a layer over the current page (using JavaScript), rather than replacing the page in the browser window. The Overlay module did not sufficiently validate URLs prior to displaying their contents, leading to an open redirect vulnerability (CVE-2013-6389).

The updated packages has been upgraded to the 7.24 version which is unaffected by these security flaws.

Update :

Additional apache ACL restrictions has been added to fully conform to the SA-CORE-2013-003 advisory.

The remote web server is running a version of Drupal that is 7.x prior to 7.20. It is, therefore, affected by a flaw during the handling of on-demand generation of image derivatives. A remote attacker, using a large number of derivative requests, could exploit this to cause a denial of service by filling up server disk space and causing a very high CPU load.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Drupal Security Team reports :

Drupal core's Image module allows for the on-demand generation of image derivatives. This capability can be abused by requesting a large number of new derivatives which can fill up the server disk space, and which can cause a very high CPU load. Either of these effects may lead to the site becoming unavailable or unresponsive.

ID	Name	Product	Family	Severity
9726	Drupal 7.x < 7.20 DoS	Nessus Network Monitor	CGI	medium
71101	Mandriva Linux Security Advisory : drupal (MDVSA-2013:287-1)	Nessus	Mandriva Local Security Checks	medium
64990	Drupal 7.x < 7.20 On-Demand Image Derivative Generation Handling Resource Exhaustion DoS	Nessus	CGI abuses	medium
64744	FreeBSD : drupal7 -- Denial of service (a4d71e4c-7bf4-11e2-84cd-d43d7e0c7c02)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2013-0316

high

Tenable Plugins

medium

medium

medium

medium