[ GLSA 201808-02 ] LinuX Containers user space utilities

[GLSA]

Gentoo Linux Security Advisory

Title: LinuX Containers user space utilities: Arbitrary file read (GLSA 201808-02)
Severity: low
Exploitable: local
Date: 2018-08-22
Bug(s): #662780
ID: 201808-02

Synopsis

A vulnerability has been found in LXC which may allow for arbitrary
file access (read-only).


Background

LinuX Containers user space utilities.

Affected Packages

Package: app-emulation/lxc
Vulnerable: < 2.1.1-r1
Unaffected: >= 2.1.1-r1
Architectures: All supported architectures


Description

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.


Impact

A local unprivileged user could use this flaw to access arbitrary files,
including special device files.


Workaround

There is no known workaround at this time.

Resolution

All LXC users should upgrade to the latest version: