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

Credit: Egidio Romano
Risk: High
Local: No
Remote: Yes
CWE: CWE-264

CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

-------------------------------------------------------------------------------- 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

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