Description
WordPress Plugin Gravity Forms is prone to a vulnerability that lets attackers upload arbitrary files because the application fails to properly sanitize user-supplied input. An attacker can exploit this vulnerability to upload arbitrary code and run it in the context of the webserver process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible. WordPress Plugin Gravity Forms version 1.8.19 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 1.8.20 or latest
References
https://blog.sucuri.net/2015/02/malware-cleanup-to-arbitrary-file-upload-in-gravity-forms.html
https://www.exploit-db.com/exploits/39969/
https://packetstormsecurity.com/files/137522/WordPress-Gravity-Forms-1.8.19-Shell-Upload.html
Related Vulnerabilities
Drupal Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2007-6752)
TYPO3 Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2012-1607)
WordPress Plugin Ceceppa Multilingua Unspecified Vulnerability (1.5.3)
WordPress Plugin Auctions 'upload.php' Arbitrary File Upload (2.0.1.3)