u5CMS 3.9.3 (deletefile.php) Arbitrary File Deletion Vulnerability

Title: u5CMS 3.9.3 (deletefile.php) Arbitrary File Deletion Vulnerability
Advisory ID: ZSL-2015-5226
Type: Local/Remote
Impact: Manipulation of Data
Risk: (3/5)
Release Date: 09.02.2015
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.
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.
Stefan P. Minder - http://www.yuba.ch
Affected Version
3.9.3 and 3.9.2
Tested On
Apache 2.4.10 (Win32)
PHP 5.6.3
MySQL 5.6.21
Vendor Status
[29.12.2014] Vulnerability discovered.
[04.02.2015] Contact with the vendor.
[04.02.2015] Vendor replies asking more details.
[05.02.2015] Sent details to the vendor.
[06.02.2015] Vendor releases version 3.9.4 to address this issue.
[09.02.2015] Coordinated public security advisory released.
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>
[1] http://yuba.ch/index.php?c=u5cms&l=en
[2] http://www.exploit-db.com/exploits/36026
[3] http://xforce.iss.net/xforce/xfdb/100773
[4] http://cxsecurity.com/issue/WLB-2015020039
[5] http://packetstormsecurity.com/files/130325
[6] http://osvdb.org/show/osvdb/118104
[7] http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1577
[8] http://cve.mitre.org/cgi-bin/cvename.cgi?name=2015-1577
[09.02.2015] - Initial release
[11.02.2015] - Added reference [2], [3], [4], [5] and [6]
[12.02.2015] - Added reference [7] and [8]
Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk