CVE-2015-5074 - Arbitrary File Upload In X2Engine Inc. X2Engine

Vulnerability title: Arbitrary File Upload In X2Engine Inc. X2Engine
CVE: CVE-2015-5074
Vendor: X2Engine Inc.
Product: X2Engine
Affected version: 4.2
Fixed version: 5.2
Reported by: Simone Quatrini
Details:

It was discovered that authenticated users were able to upload files of any type providing that the file did not have an extension that was listed in the following blacklist:

const EXT_BLACKLIST = '/\.\s*(P<ext>html|htm|js|jsb|mhtml|mht|xhtml|xht|php|phtml|php3|php4|php5|phps|shtml|jhtml|pl|py|cgi|exe|scr|dll|msi|vbs|bat|com|pif|cmd|vxd|cpl|ini|conf|cnf|key|iv|htaccess)\b/i';

However, there is another common (not present in regexp) that allow PHP execution: .PHT. It is therefore possible to execute any PHP code on the remote system.

Further details at:

https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2015-5074/

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