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X2Engine 4.1.7 Unrestricted File Upload

X2Engine 4.1.7 Unrestricted File Upload
Posted Sep 23, 2014
Authored by EgiX

X2Engine versions 4.1.7 and below suffer from an unrestricted file upload vulnerability due to poor use of a blacklist.

tags | exploit, file upload
advisories | CVE-2014-5298
MD5 | 146f05b73cebbdf28b5a12d4a6a158f2

X2Engine 4.1.7 Unrestricted File Upload

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


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