Date: Tue, 28 Jun 2011 14:21:47 +0200 From: Ludwig Nussel <ludwig.nussel@...e.de> To: "Steven M. Christey" <coley@...us.mitre.org> Cc: oss-security@...ts.openwall.com Subject: Re: CVE request -- coreutils -- tty hijacking possible in "su" via TIOCSTI ioctl Ludwig Nussel wrote: > Josh Bressers wrote: > >----- Original Message ----- > >> Jan Lieskovsky wrote: > >> > Hello Josh, Steve, vendors, > >> > > >> > based on Debian BTS report: > >> >  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=628843 > >> > (first CVE-2011-XXYY required for Debian case) > >> > > >> > looked more into original report: > >> >  https://bugzilla.redhat.com/show_bug.cgi?id=173008 > >> > > >> > and the first paragraph of  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. > >> > > >> > Could you allocate these? > >> > >> ping! :-) > > > >I'm not sure if this should get two IDs. It's really one issue, which isn't > >actually fixed in su. > > > >The fundamental issue is that tools like su and sudo keep the tty open. > >The patch in question closes the tty for the case of su -c, but not for > >just running su by itself. It is incomplete. > > I'm not worried too much about the interactive su case really. The > usual direction there is user->root, not the other way around I > suppose. "su -c" might be used by (%post) scripts though as seen > with ikiwiki. So can we have a CVE for that issue at least? cu Ludwig -- (o_ Ludwig Nussel //\ V_/_ http://www.suse.de/ SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
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