USN-2813-1: LXCFS vulnerabilities

Ubuntu Security Notice USN-2813-1

17th November, 2015

lxcfs vulnerabilities

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

• Ubuntu 15.10
• Ubuntu 15.04

Summary

Several security issues were fixed in LXCFS.

Software description

• lxcfs - FUSE based filesystem for LXC

Details

It was discovered that LXCFS incorrectly enforced directory escapes. A
local attacker could use this issue to possibly escalate privileges.
(CVE-2015-1342)

It was discovered that LXCFS incorrectly checked certain permissions. A
local attacker could use this issue t possibly escalate privileges.
(CVE-2015-1344)

Update instructions

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

Ubuntu 15.10:

lxcfs 0.10-0ubuntu2.1

Ubuntu 15.04:

lxcfs 0.7-0ubuntu4.1

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

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

CVE-2015-1342, CVE-2015-1344