ProFTPD Unauthenticated Remote File Copying

May 22, 2015

ProFTPD includes a number of modules to allow a FTP server to be extended. The mod_copy module contained in the mod_copy.c file for ProFTPD 1.3.x implements SITE CPFR and SITE CPTO commands, which can be used to copy files/directories from one place to another on the server without having to transfer the data to the client and back.

However, an access control weakness exists in mod_copy module. The vulnerability is due to a lack of access control and allows a remote, unauthenticated user to manipulate files on the target system. A remote attacker could exploit this vulnerability by sending crafted FTP commands to the affected service. Successful exploitation would result in arbitrary code execution on the target system.

Dell SonicWALL has released an IPS signature to detect and block exploitation attempts targeting this vulnerability. The signature is listed below:

10923 ProFTPD Unauthenticated Remote File Copying