CMS WordPress Aviary Image Editor Arbitrary File Upload

Versions less than 3.0R6 of the WordPress plugin Aviary-Image-Editor-Addon-For-Gravity-Forms are vulnerable to arbitrary file upload. Unauthenticated users are able to upload any file type, including executable PHP, to the server.

Exploitation

Stages

1. The attacker sends an HTTP POST request with executable PHP file to the path of the vulnerable Aviary Image Editor WordPress plugin on the server.
2. The server replies with an HTTP 200 OK and JSON format success message with a path to the uploaded file.

Prerequisites

Attackers can access and exploit the vulnerable PHP file directly and without authentication.

Alert Logic Coverage

Alert Logic® has evaluated its customer base for exposure to the exploit and has developed signatures for mitigating the threat depending on the security service in place.

The Network-Based Intrusion Detection System (IDS) has been updated with the new signatures for this exploit when detected via Alert Logic Threat Manager™. If this signature is detected, an incident is generated in the Alert Logic console.

Recommendations for Mitigation

Upgrade to a non-vulnerable version to mitigate this vulnerability.