Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 13 Mar 2017 20:07:14 -0500
From: Tyler Hicks <tyhicks@...onical.com>
To: oss-security@...ts.openwall.com
Cc: St├ęphane Graber <stgraber@...ntu.com>,
 serge.hallyn@...ntu.com
Subject: Re: LXC: CVE-2017-5985: lxc-user-nic didn't verify
 network namespace ownership

On 03/10/2017 06:03 AM, Stiepan wrote:
> I don't know whether that is the same bug, or a related one, but on Debian8 using LXC from jessie-backports, setting the default route in a container affects the host - namely, from an unpriv. container, setting the route sets the host's route as well.
> lxc-info --version outputs 2.0.6 and no update is currently available (on Debian).

Thanks for the report. I just tried to reproduce the issue on Ubuntu
16.04 with 2.0.7-0ubuntu1~16.04.2, which is the package patched for the
issue that I announced in this thread. I couldn't reproduce it.

I then installed an old 2.0.6 based deb (2.0.6-0ubuntu1~ubuntu16.04.1)
and still couldn't reproduce it.

I'd suggest opening an upstream bug here:

  https://github.com/lxc/lxc/issues/new

(Normally, they prefer private security bugs on Launchpad but your
report to this list is already public so I don't see a need.)

Tyler

> Stiepan
> 
> 
> 
> -------- Original Message --------
> Subject: [oss-security] LXC: CVE-2017-5985: lxc-user-nic didn't verify network namespace ownership
> Local Time: 9 March 2017 5:54 PM
> UTC Time: 9 March 2017 16:55
> From: tyhicks@...onical.com
> To: oss-security@...ts.openwall.com
> St├ęphane Graber <stgraber@...ntu.com>
> 
> Jann Horn discovered that the lxc-user-nic program could be tricked into
> operating on a network namespace over which the caller did not hold
> privilege.
> 
> The behavior didn't follow what was documented in the lxc-user-nic(1)
> man page:
> 
> It ensures that the calling user is privileged over the network
> namespace to which the interface will be attached.
> 
> This issue is CVE-2017-5985.
> 
> https://lists.linuxcontainers.org/pipermail/lxc-users/2017-March/012925.html
> https://launchpad.net/bugs/1654676
> https://github.com/lxc/lxc/commit/16af238036a5464ae8f2420ed3af214f0de875f9
> 
> Tyler
> 




Download attachment "signature.asc" of type "application/pgp-signature" (802 bytes)

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.