ProFTPD is an advanced and very configurable FTP server.
It was discovered that ProFTPD’s “mod_copy” module does not properly restrict privileges for anonymous users.
A remote attacker, by anonymously uploading a malicious file, could possibly execute arbitrary code with the privileges of the process, cause a Denial of Service condition or disclose information.
There is no known workaround at this time.
All ProFTPD users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-ftp/proftpd-1.3.6-r5"