Date: Tue, 6 Nov 2012 15:06:57 +0100 From: Marcus Meissner <meissner@...e.de> To: oss-security@...ts.openwall.com, disclosure@....org Subject: Re: Re: TTY handling when executing code in different lower-privileged context (su, virt containers) On Wed, Nov 07, 2012 at 12:37:25AM +1100, David Black wrote: > >In both cases, paranoid administrators might decide to use /dev/null > >as stdin/stdout/stderr when just starting non-interactive programs in > >different context, while they could replace the privileged shell with > >exec when interactive context switch is needed (no shell, no escalation). > > > >Any opinions on that? > > > > > Perhaps if sudo/su determine if a user is running 'interactively' they > could use a pseudo-pty ? There were fixes released btw ... (If we are talking about the same problem.) SUSE at least did release fixes for the terminal character injection, by opening a new session. (CVE-2005-4890 is this whole issue I think.) Ludwig Nussel tried to also use pseudo tty, but this gets kind of messy soon, especially if you start with the signal handling required (ctrl-z and ctrl-c over su are supposed to work...). Fun enough, after release one of our customers reported to actually use code like: su nobody -c "echo Test >/dev/tty" Ciao, Marcus
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