Albert Puigsech Galicia discovered a directory traversal vulnerability in a proprietary FTP client (CAN-2004-1376) which is also present in gftp, a GTK+ FTP client. A malicious server could provide a specially crafted filename that could cause arbitrary files to be overwritten or created by the client.
For the stable distribution (woody) this problem has been fixed in version 2.0.11-1woody1.
For the unstable distribution (sid) this problem has been fixed in version 2.0.18-1.
We recommend that you upgrade your gftp package.