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

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.

Description

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.

Vendor

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.

PoC

u5cms_del.txt

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[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

Changelog

[09.02.2015] - Initial release
[11.02.2015] - Added reference [2], [3], [4], [5] and [6]
[12.02.2015] - Added reference [7] and [8]

Contact

Zero Science Lab

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