View online: https://www.drupal.org/node/2765573 * Advisory ID: DRUPAL-SA-CONTRIB-2016-038 * Project: Webform Multiple File Upload [1] (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 [2] * Vulnerability: Arbitrary PHP code execution -------- DESCRIPTION --------------------------------------------------------- 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 [3] will be requested, and added upon issuance, in accordance with Drupal Security Team processes./ -------- VERSIONS AFFECTED --------------------------------------------------- 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 [4] module, there is nothing you need to do. -------- SOLUTION ------------------------------------------------------------ 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 [5] Also see the Webform Multiple File Upload [6] project page. -------- REPORTED BY --------------------------------------------------------- * Ben Dougherty [7] of the Drupal Security Team -------- FIXED BY ------------------------------------------------------------ * Jelle Sebreghts [8] the module maintainer * Peter Droogmans [9] the module maintainer -------- COORDINATED BY ------------------------------------------------------ * Ben Dougherty [10] of the Drupal Security Team * Greg Knaddison [11] 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 https://www.drupal.org/contact [12]. Learn more about the Drupal Security team and their policies [13], writing secure code for Drupal [14], and securing your site [15]. Follow the Drupal Security Team on Twitter at https://twitter.com/drupalsecurity [16] [1] https://www.drupal.org/project/webform_multifile [2] https://www.drupal.org/security-team/risk-levels [3] http://cve.mitre.org/ [4] https://www.drupal.org/project/webform_multifile [5] https://www.drupal.org/project/webform_multifile/releases/7.x-1.4 [6] https://www.drupal.org/project/webform_multifile [7] https://www.drupal.org/user/1852732 [8] https://www.drupal.org/user/829198 [9] https://www.drupal.org/user/105002 [10] https://www.drupal.org/user/1852732 [11] https://www.drupal.org/user/36762 [12] https://www.drupal.org/contact [13] https://www.drupal.org/security-team [14] https://www.drupal.org/writing-secure-code [15] https://www.drupal.org/security/secure-configuration [16] https://twitter.com/drupalsecurity