Thanks to all mailing list for the reply :) I undestand that it's a
feature :) I doesn't know the SIGQUIT :)

Admin wrote:
> Hello all,
> in these days I got a strange core dump using the ftp client.
> This core dump can only did by using the PUTTY ssh client...
>
> (Tested with putty 0.52)
>
> >rootWayreth[~]: ftp ftp.unina.it
> >Connected to ftp.unina.it.
> >220
> >Name (ftp.unina.it:root): ^\Quit (core dumped)
> >rootWayreth[~]:
>
> for do that, just push CTRL+ù when the user is requested...
>
> Tested system:
> -OpenBSD 3.1
> -OpenBSD 3.0
> -OpenBSD 2.9
> -FreeBSD 4.4-RC5
> -FreeBSD 4.5-STABLE
> -FreeBSD kalieye 4.6-RC FreeBSD 4.6-RC
> -SunOS XXXXX 5.6 Generic_105181-30 sun4u sparc SUNW,Ultra-Enterprise
> -SunOS XXXXX 5.6 Generic_105182-30 i86pc i386 i86pc
>
> Not vulnerable:
> -Linux
>
> This bug haven't any security issue, it's only a client and not with the
> +s flag. In these day I haven't the time to check the source code for
> see what's is wrong, I will did it in some days...
>
> Agazzini Maurizio
> adminwww.dragonlance.eu.org
>
>
>

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