Plone: XSS

Plone: XSS

Date: 2017-01-26 10:28:58
Security Advisory – Curesec Research Team

1. Introduction

Affected Product: Plone 5.0.5
Fixed in: Hotfix 20170117
Fixed Version Link:
Vendor Contact:
Vulnerability Type: XSS
Remote Exploitable: Yes
Reported to vendor: 09/05/2016
Disclosed to public: 01/26/2017
Release mode: Coordinated Release
CVE: CVE-2016-7147
Credits Tim Coen of curesec GmbH

2. Overview

Plone is an open source CMS written in python. In version 5.0.5, the Zope Management Interface (ZMI) component is vulnerable to reflected XSS as it does not properly encode double quotes.

3. Details

CVSS: Medium 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Description: The search functionality of the management interface is vulnerable to reflected XSS. As the input is echoed into an HMTL attribute, an attacker can use double quotes to escape the current attribute and add new attributes to enter a JavaScript context.

Proof of Concept:

4. Solution

To mitigate this issue please apply the hotfix 20170117.

Please note that a newer version might already be available.

5. Report Timeline

09/05/2016 Contacted Vendor, Vendor confirmed, Requested CVE
09/06/2016 CVE assigned
09/06/2016 Vendor requests 90 days to release fix
01/10/2017 Contacted Vendor Again, Vendor announces hotfix
01/17/2017 Vendor releases hotfix
01/26/2017 Disclosed to public