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Ubuntu Security Notice USN-2675-1
July 22, 2015

lxc vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 15.04
• Ubuntu 14.10
• Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in LXC.

Software Description:

• lxc: Linux Containers userspace tools

Details:

Roman Fiedler discovered that LXC had a directory traversal flaw when creating
lock files. A local attacker could exploit this flaw to create an arbitrary
file as the root user. (CVE-2015-1331)

Roman Fiedler discovered that LXC incorrectly trusted the container's proc
filesystem to set up AppArmor profile changes and SELinux domain transitions. A
local attacker could exploit this flaw to run programs inside the container
that are not confined by AppArmor or SELinux. (CVE-2015-1334)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 15.04:
liblxc1 1.1.2-0ubuntu3.1
lxc 1.1.2-0ubuntu3.1

Ubuntu 14.10:
liblxc1 1.1.0~alpha2-0ubuntu3.3
lxc 1.1.0~alpha2-0ubuntu3.3

Ubuntu 14.04 LTS:
liblxc1 1.0.7-0ubuntu0.2
lxc 1.0.7-0ubuntu0.2

In general, a standard system update will make all the necessary changes. You
will need to restart your previously running LXC containers in Ubuntu 15.04 due
to bug that causes containers to be stopped on during lxc package installation
(https://launchpad.net/bugs/1476691).

References:
http://www.ubuntu.com/usn/usn-2675-1
CVE-2015-1331, CVE-2015-1334

Package Information:
https://launchpad.net/ubuntu/+source/lxc/1.1.2-0ubuntu3.1
https://launchpad.net/ubuntu/+source/lxc/1.1.0~alpha2-0ubuntu3.3
https://launchpad.net/ubuntu/+source/lxc/1.0.7-0ubuntu0.2

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