ProFTPD controls buffer overflow exploit

The internal stack may be overrun using the controls module with a special crafted control sequence. This condition can be exploited by attackers to ultimately execute instructions with the privileges of the ProFTPD process, typically administrator or system. Exploitation requires valid local user, with access to the controls socket. After successful exploitation an agent will be deployed. This agent will inherit the user identity and capabilities of the abused service, usually those of the ftp server. However, the euid (as opposite to the uid) of the agent may be not that of the super user (usually is "nobody"), and by using the setuid module (see setuid module documentation), it can be changed to zero (root). This exploit may cause a Denial of Service on the target ProFTPD server.