- Advisory ID: DRUPAL-SA-CONTRIB-2016-038
- Project: Webform Multiple File Upload (third-party module)
- Version: 7.x
- Date: 2016-July-13
- Security risk: 17/25 ( Critical) AC:Basic/A:User/CI:All/II:All/E:Theoretical/TD:Default
- Vulnerability: Arbitrary PHP code execution
The Webform Multiple File Upload module allows users to upload multiple files on a Webform.
The Webform Multifile File Upload module contains a Remote Code Execution (RCE) vulnerability where form inputs will be unserialized and a specially crafted form input may trigger arbitrary code execution depending on the libraries available on a site.
This vulnerability is mitigated by the fact that an attacker must have the ability to submit a Webform with a Multiple File Input field. Further, a site must have an object defined with methods that are invoked at wake/destroy that include code that can be leveraged for malicious purposes. Drupal 7 Core contains one such class which can be used to delete arbitrary files, but contributed or custom classes may include methods that can be leveraged for RCE.
Note: this vulnerability exists in the Webform Multiple File Upload (webform_multifile) module. There is a similarly named module Webform Multiple File (webform_multiple_file) which is not related to this issue.
CVE identifier(s) issued
- A CVE identifier will be requested, and added upon issuance, in accordance with Drupal Security Team processes.
Webform Multifile 7.x-1.x versions prior to 7.x-1.4
Drupal core is not affected. If you do not use the contributed Webform Multiple File Upload module, there is nothing you need to do.
Install the latest version:
- If you use the Webform Multifile module for Drupal 7.x, upgrade to Webform Multiple File Upload 7.x-1.4
Also see the Webform Multiple File Upload project page.
- Ben Dougherty of the Drupal Security Team
Contact and More Information
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