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

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Date: Mon, 6 Jun 2011 13:22:02 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Russell Coker <rcoker@...hat.com>, Daniel Ruoso <daniel@...so.com>,
        "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request -- coreutils -- tty hijacking
 possible in "su" via TIOCSTI ioctl

----- Original Message -----
> Hello Josh, Steve, vendors,
> 
> based on Debian BTS report:
> [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=628843
> (first CVE-2011-XXYY required for Debian case)
> 
> looked more into original report:
> [2] https://bugzilla.redhat.com/show_bug.cgi?id=173008
> 
> and the first paragraph of [2] suggests:
> "When starting a program via "su - user -c program" the user session
> can escape to the parent session by using the TIOCSTI ioctl to push
> characters into the input buffer. This allows for example a non-root
> session to push "chmod 666 /etc/shadow" or similarly bad commands into
> the input buffer such that after the end of the session they are
> executed."
> 
> this should get a CVE-2005-YYZZ CVE id.
> 

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 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.

I'm happy to let MITRE overrule me.

-- 
    JB

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