lxc-user-nic in Linux Containers (LXC) allows local users with a lxc-usernet allocation to create network interfaces on the host and choose the name of those interfaces by leveraging lack of netns ownership check.

This update for lxc, lxcfs to version 3.1.0 fixes the following issues :

Security issues fixed :

  - CVE-2019-5736: Fixed a container breakout vulnerability     (boo#1122185).

  - CVE-2018-6556: Enable setuid bit on lxc-user-nic     (boo#988348).

Non-security issues fixed :

  - Update to LXC 3.1.0. The changelog is far too long to     include here, please look at     https://linuxcontainers.org/. (boo#1131762)

This update to version 1.1.5 for lxc fixes the following issues :

This security issue was fixed :

CVE-2017-5985: lxc-user-nic allowed access to network namespace over which the caller did not hold privilege (boo#1028264).

This non-security issue was fixed :

  - boo#1019662: Fixed issue with apparmor preventing the     start of containers

This update for lxc fixes the following issues :

This security issue was fixed :

CVE-2017-5985: lxc-user-nic allowed access to network namespace over which the caller did not hold privilege (boo#1028264).

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3224-1 advisory.

    Jann Horn discovered that LXC incorrectly verified permissions when creating virtual network interfaces. A     local attacker could possibly use this issue to create virtual network interfaces in network namespaces     that they do not own.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
125668	openSUSE Security Update : lxc / lxcfs (openSUSE-2019-1481)	Nessus	SuSE Local Security Checks	high
99328	openSUSE Security Update : lxc (openSUSE-2017-464)	Nessus	SuSE Local Security Checks	low
99327	openSUSE Security Update : lxc (openSUSE-2017-463)	Nessus	SuSE Local Security Checks	low
97659	Ubuntu 14.04 LTS / 16.04 LTS : LXC vulnerability (USN-3224-1)	Nessus	Ubuntu Local Security Checks	low

Detections

Analytics

CVE-2017-5985

low

Tenable Plugins

high

low

low

low