X2Engine <= 4.1.7 (FileUploadsFilter.php) Unrestricted File Upload Vulnerability
• Software Link:
• 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.
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:
Vulnerability discovered by Egidio Romano.