USN-2988-1: LXD vulnerabilities

Ubuntu Security Notice USN-2988-1

31st May, 2016

lxd vulnerabilities

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

• Ubuntu 16.04 LTS
• Ubuntu 15.10

Summary

Several security issues were fixed in LXD.

Software description

• lxd - Container hypervisor based on LXC

Details

Robie Basak discovered that LXD incorrectly set permissions when setting up
a loop based ZFS pool. A local attacker could use this issue to copy and
read the data of any LXD container. (CVE-2016-1581)

Robie Basak discovered that LXD incorrectly set permissions when switching
an unprivileged container into privileged mode. A local attacker could use
this issue to access any world readable path in the container directory,
including setuid binaries. (CVE-2016-1582)

Update instructions

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

Ubuntu 16.04 LTS:

lxd 2.0.2-0ubuntu1~16.04.1

Ubuntu 15.10:

lxd 0.20-0ubuntu4.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

CVE-2016-1581, CVE-2016-1582