Re: CVE request -- coreutils -- tty hijacking possible in "su" via TIOCSTI ioctl

["daniel () ruoso com" <daniel () ruoso com>]

Josh Bressers <bressers () redhat com> wrote:
> This really shouldn't get a CVE id. It's well known, and sadly, not easy
> to
> fix. There are more details in this bug:
> https://bugzilla.redhat.com/show_bug.cgi?id=479145

I failed to see why setsid() doesn't prevent the priviledges escalation. AFAIU the exploit is only possible if the 
process has a controlling tty, which is prevented by setsid()

> I would classify this as an administration issue, not a flaw in su or
> sudo.
> If you're running arbitrary things, you're in far more trouble than
> this.

Well, you're not running arbitrary things, you're running commands as a less priviledged user under the assumption that 
it will be restricted to that user.

The scenario of having this less priviledged user compromised without admin knowledge is not far from real.

I, for instance, use su -u to run commands as the www user, what are the odds of that user being compromised without my 
knowledge? The last thing I want is having a way for that compromised user to run arbitrary commands as any other user.

Daniel