GNU bug report logs - #24541
runcon tty hijacking via TIOCSTI ioctl

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From: up201407890 <at> alunos.dcc.fc.up.pt
To: "Paul Eggert" <eggert <at> cs.ucla.edu>
Cc: 24541 <at> debbugs.gnu.org, SE-Linux <SELinux <at> tycho.nsa.gov>
Subject: bug#24541: runcon tty hijacking via TIOCSTI ioctl
Date: Mon, 26 Sep 2016 08:38:11 +0200

Quoting "Paul Eggert" <eggert <at> cs.ucla.edu>:

Hello,

I set the bug report here before I got a response from Paul Moore
https://marc.info/?l=selinux&m=147481004710264&w=2

"I don't think we need to fix this for runcon, as it isn't as
sandboxing tool like sandbox, and the loss of job control would likely
be much more noticeable for runcon."


> up201407890 <at> alunos.dcc.fc.up.pt wrote re <http://bugs.gnu.org/24541>:
>> When executing a program via the runcon utility, the nonpriv session
>> can escape to the parent session by using the TIOCSTI ioctl to push
>> characters into the terminal's input buffer, allowing an attacker to
>> execute arbitrary commands without the SELinux security context.
>
> Thanks for the bug report. Surely this is a bug in the setexeccon  
> system call, not in the runcon command that uses the system call.  
> That being said, perhaps runcon should work around the bug via  
> something like the attached patch.
>



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