UBUNTU-CVE-2018-6556

lxc-user-nic when asked to delete a network interface will unconditionally open a user provided path. This code path may be used by an unprivileged user to check for the existence of a path which they wouldn't otherwise be able to reach. It may also be used to trigger side effects by causing a (read-only) open of special kernel files (ptmx, proc, sys). Affected releases are LXC: 2.0 versions above and including 2.0.9; 3.0 versions above and including 3.0.0, prior to 3.0.2.

References

Affected packages

Ubuntu:18.04:LTS / lxc

Package

Name: lxc
Purl: pkg:deb/ubuntu/lxc@3.0.1-0ubuntu1~18.04.2?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.0.1-0ubuntu1~18.04.2

Affected versions

2.*

2.1.0-0ubuntu1

2.1.1-0ubuntu1

3.*

3.0.0~beta1-0ubuntu3

3.0.0~beta2-0ubuntu2

3.0.0~beta3-0ubuntu1

3.0.0~beta4-0ubuntu1

3.0.0-0ubuntu1

3.0.0-0ubuntu2

3.0.1-0ubuntu1~18.04.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "liblxc-common"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "liblxc-dev"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "liblxc1"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "libpam-cgfs"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "lxc"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "lxc-dev"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "lxc-utils"
        },
        {
            "binary_version": "3.0.1-0ubuntu1~18.04.2",
            "binary_name": "lxc1"
        }
    ]
}