--------------------------------------------------------------------------------
X2Engine <= 4.1.7 (FileUploadsFilter.php) Unrestricted File Upload Vulnerability
--------------------------------------------------------------------------------


[-] Software Link:

http://www.x2engine.com/


[-] Affected Versions:

Version 4.1.7 and probably prior versions.


[-] Vulnerability Description:

The vulnerability exists because of the FileUploadsFilter::EXT_BLACKLIST constant, which is a regular
expression for blacklisted files. Due to a lack of case-insensitive matching, the global upload filter
could be bypassed by uploading a malicious file with capital letters within the extension. This can be
exploited to upload and execute arbitrary PHP scripts if X2Engine is running on a case-insensitive
filesystem or if the web server is configured to handle files’ extensions in a case-insensitive fashion.


[-] Solution:

Update to version 4.2 or later.


[-] Disclosure Timeline:

[01/08/2014] - Vendor notified
[02/08/2014] - CVE number requested
[16/08/2014] - CVE number assigned
[05/09/2014] - Version 4.2 released
[23/09/2014] - Public disclosure


[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2014-5298 to this vulnerability.


[-] Credits:

Vulnerability discovered by Egidio Romano.


[-] Original Advisory:

http://karmainsecurity.com/KIS-2014-10