Re: vsftpd problem in deny_hosts

[Moritz Muehlenhoff <jmm () debian org>]

On Tue, Feb 03, 2015 at 12:45:24PM +0300, Solar Designer wrote:
> On Tue, Feb 03, 2015 at 09:28:36AM +0100, Marcus Meissner wrote:
> > IBM reported to us a problem in vsftpd deny_hosts problem.
> >
> > CVE-2015-1419
> >
> > https://bugzilla.novell.com/show_bug.cgi?id=915522
> >
> > Description;
> >  Set the option "deny_file" in /etc/vsftpd.conf on a top-directory (for example "deny_file=/home/*")
> >  Then log in with ftp and try to cd to "/home/" first, which will fail, then try to cd to "/./home/" which will 
> > succeed!
> >  The latter case shouldn't be possible as well!
>
> What does upstream say about this?  (CC'ing.)

At least the man page states the deny_file is not a full-blown security measure:

| This option is very simple, and should not be used for serious
| access control - the filesystem's permissions should be used in preference.

Cheers,
        Moritz