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Date: Mon, 07 Dec 2015 18:14:17 +0100
From: "Curesec Research Team (CRT)" <>
Subject: [FD] redaxscript 2.5.0: XSS

Security Advisory - Curesec Research Team

1. Introduction

Affected Product:   redaxscript 2.5.0
Fixed in:           2.6.1
Fixed Version Link:
Vendor Contact:
Vulnerability Type: XSS
Remote Exploitable: Yes
Reported to vendor: 10/02/2015
Disclosed to        12/02/2015
Release mode:       Coordinated release
CVE:                n/a
Credits             Tim Coen of Curesec GmbH

2. Overview


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


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:

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

Blog Reference:

Curesec GmbH
Curesec Research Team
Romain-Rolland-Str 14-24
13089 Berlin, Germany

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