WordPress SupportCandy Plugin <=2.0 Arbitrary File Upload

There exists an arbitrary file upload vulnerability in the WordPress plugin SupportCandy <= 2.0. The vulnerability exists due to the upload_file_rb.php script making no attempt to check authorization or the upload file type. The exploit does require that an upload directory has already been created via the upload_file.php script through legitimate usage. 

Exploitation 

Stages 

1. An attacker sends an upload request containing an arbitrary file to a vulnerable WordPress instance. 
   
   
2. The server responds with a ‘200’ response code and echoes the name of the upload directory. 
   
   
3. The attacker requests the uploaded file from the directory (it will be executed if PHP). 

Prerequisites 

The attacker must be able to send crafted packets to the target system. 

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.