USN-2675-1: LXC vulnerabilities

Releases

• Ubuntu 15.04
• Ubuntu 14.10
• Ubuntu 14.04 ESM

Packages

• 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

• 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

• CVE-2015-1331
• CVE-2015-1334