lxc-attach in LXC before 1.0.9 and 2.x before 2.0.6 allows an attacker inside of an unprivileged container to use an inherited file descriptor, of the host's /proc, to access the rest of the host's filesystem via the openat() family of syscalls.

This update for lxc fixes the following issue :

  - CVE-2016-8649: guest escape via ptrace of lxc-attach     (boo#1010933).

Update LXC to the latest stable version.

See [here](https://linuxcontainers.org/lxc/news/) for the list of changes.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-3136-1 advisory.

    Roman Fiedler discovered a directory traversal flaw in lxc-attach. An attacker with access to an LXC     container could exploit this flaw to access files outside of the container.

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
96029	openSUSE Security Update : lxc (openSUSE-2016-1488)	Nessus	SuSE Local Security Checks	critical
95785	Fedora 23 : lxc (2016-e5ff0ed40c)	Nessus	Fedora Local Security Checks	critical
95784	Fedora 24 : lxc (2016-b4dd1db1e7)	Nessus	Fedora Local Security Checks	critical
95782	Fedora 25 : lxc (2016-868350fe5a)	Nessus	Fedora Local Security Checks	critical
95295	Ubuntu 14.04 LTS / 16.04 LTS : LXC vulnerability (USN-3136-1)	Nessus	Ubuntu Local Security Checks	critical

Detections

Analytics

CVE-2016-8649

critical

Tenable Plugins

critical

critical

critical

critical

critical