redaxscript 2.5.0: XSS

Date: 2015-12-02 10:49:21

Security Advisory – Curesec Research Team

1. Introduction

Affected Product:	redaxscript 2.5.0
Fixed in:	2.6.1
Fixed Version Link:	http://redaxscript.com/files/releases/redaxscript_2.6.1_full.zip
Vendor Contact:	info@redaxmedia.com
Vulnerability Type:	XSS
Remote Exploitable:	Yes
Reported to vendor:	10/02/2015
Disclosed to public:	12/02/2015
Release mode:	Coordinated release
CVE:	n/a
Credits	Tim Coen of curesec GmbH

2. Overview

CVSS

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

Description

There is a persistent XSS vulnerability when leaving comments. It requires the admin to hover over a link to trigger the injected code.

This issue can lead to the injection of JavaScript keyloggers, or the bypassing of CSRF protection. In this case, this may lead to code execution.

The issue has been partially fixed in version 2.6.0. However, it was still possible to inject a style attribute, making XSS in older browsers possible. This has been fixed in version 2.6.1.

3. Proof of Concept

1. Create a comment, as comment text use: comment" onmouseover=alert(1) foo=" 2. In the sidebar, hover over the comment to trigger the XSS.

4. Solution

To mitigate this issue please upgrade at least to version 2.6.1:

http://redaxscript.com/files/releases/redaxscript_2.6.1_full.zip

Please note that a newer version might already be available.

5. Report Timeline

10/02/2015	Informed Vendor about Issue
11/15/2015	Vendor releases partial fix
11/24/2015	Informed vendor that fix is incomplete
11/25/2015	Vendor releases fix
12/02/2015	Disclosed to public