USN-2988-1: LXD vulnerabilities

31 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 versions:

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