It was discovered that in lftp, a command-line HTTP/FTP client, there is no proper validation of the filename provided by the server through the Content-Disposition header; attackers can use this flaw by suggesting a filename they wish to overwrite on the client machine, and then possibly execute arbitrary code . For the stable distribution , this problem has been fixed in version 3.7.3-1+lenny1. For the testing distribution , this problem has been fixed in version 4.0.6-1. For the unstable distribution , this problem has been fixed in version 4.0.6-1. We recommend that you upgrade your lftp packages.