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Ubuntu Security Notice USN-2318-1

Ubuntu Security Notice USN-2318-1
Posted Aug 18, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2318-1 - Eric W. Biederman discovered a flaw with the mediation of mount flags in the Linux kernel's user namespace subsystem. An unprivileged user could exploit this flaw to by-pass mount restrictions, and potentially gain administrative privileges. Kenton Varda discovered a flaw with read-only bind mounds when used with user namespaces. An unprivileged local user could exploit this flaw to gain full write privileges to a mount that should be read only. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-5206, CVE-2014-5207
MD5 | e2046546526681d893be6a952597977e

Ubuntu Security Notice USN-2318-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2318-1
August 18, 2014

linux vulnerabilities
============================================================================

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Eric W. Biederman discovered a flaw with the mediation of mount flags in
the Linux kernel's user namespace subsystem. An unprivileged user could
exploit this flaw to by-pass mount restrictions, and potentially gain
administrative privileges. (CVE-2014-5207)

Kenton Varda discovered a flaw with read-only bind mounds when used with
user namespaces. An unprivileged local user could exploit this flaw to gain
full write privileges to a mount that should be read only. (CVE-2014-5206)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-34-generic 3.13.0-34.60
linux-image-3.13.0-34-generic-lpae 3.13.0-34.60
linux-image-3.13.0-34-lowlatency 3.13.0-34.60
linux-image-3.13.0-34-powerpc-e500 3.13.0-34.60
linux-image-3.13.0-34-powerpc-e500mc 3.13.0-34.60
linux-image-3.13.0-34-powerpc-smp 3.13.0-34.60
linux-image-3.13.0-34-powerpc64-emb 3.13.0-34.60
linux-image-3.13.0-34-powerpc64-smp 3.13.0-34.60

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2318-1
CVE-2014-5206, CVE-2014-5207

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-34.60

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