Re: DoS attacks on MIME-capable software via complex MIME emails

["Kurt Buff" <kurt.buff () gmail com>]

On Mon, Dec 8, 2008 at 2:56 PM, Bernhard Brehm <bruhns () recurity-labs com> wrote:
> Valdis.Kletnieks () vt edu said:
> > You want *real* loads of fun? Go read up on message/partial ;)
<snip>
> The situation is quite similiar to the reason, why MTAs like sendmail
> are no real target for such attacks: No server should try to convert
> 8bit encoding to 7bit encoding any more. Nobody needs to split a message
> into several parts for transfer and expects the mailclient to reassemble
> the parts. Not all pieces of MIME-related software really need to
> understand these rather obscure content-types.

Not exactly true. There might not be any clients which support it
currently (don't know, myself) but *my* users are constantly trying to
send huge messages that I don't allow for size reasons. Breaking them
apart into chunks automatically for automatic reassembly by the
recipient would very much appeal to them.

Kurt

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