Re: SECURITY HOLE: FormMail

[neil () legless demon co uk (Neil Woods)]

> | Just to be helpful, the way to do it more safely, without massive
> | need for checking is to build a complete mail message, including
> | header, and hand that to "sendmail -t" which then reads the recipient
> | information out of the constructed header.  [Sendmail should of course
> | be an invocation of smail or pp, not the BSD program of that name,
> | given the history of problems that has had]
>
> I suspect this still wont take care of emails to pipes or files,
> i.e  <|/bin/sh> or </.rhosts>, it is a legitimate, albeit unexpected,
> mail-command going to sendmail. So unless these two mode are totally
> stripped out of the sendmail, there will exist a vulnerability there,
> wont it?

No current version of sendmail (v8.*, any vendor supplied version) will
allow mailing directly to programs or files.  In order to deliver mail to
a program or file, it must be indirect (ie. alias expansion, or from a
users .forward file).

Cheers,

Neil
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