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Ubuntu Security Notice USN-3251-2

Ubuntu Security Notice USN-3251-2
Posted Mar 30, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3251-2 - USN-3251-1 fixed a vulnerability in the Linux kernel for Ubuntu 16.10. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.10 for Ubuntu 16.04 LTS. It was discovered that the xfrm framework for transforming packets in the Linux kernel did not properly validate data received from user space. A local attacker could use this to cause a denial of service or execute arbitrary code with administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-7184
MD5 | d2f57dbf39e6f9068665426b0f9cc880

Ubuntu Security Notice USN-3251-2

Change Mirror Download

==========================================================================
Ubuntu Security Notice USN-3251-2
March 30, 2017

linux-hwe vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

The system could be made to crash or run programs as an administrator.

Software Description:
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3251-1 fixed a vulnerability in the Linux kernel for Ubuntu 16.10.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04 LTS.

It was discovered that the xfrm framework for transforming packets in the
Linux kernel did not properly validate data received from user space. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code with administrative privileges.

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.8.0-45-generic 4.8.0-45.48~16.04.1
linux-image-4.8.0-45-generic-lpae 4.8.0-45.48~16.04.1
linux-image-4.8.0-45-lowlatency 4.8.0-45.48~16.04.1
linux-image-generic-hwe-16.04 4.8.0.45.17
linux-image-generic-lpae-hwe-16.04 4.8.0.45.17
linux-image-lowlatency-hwe-16.04 4.8.0.45.17

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
http://www.ubuntu.com/usn/usn-3251-2
http://www.ubuntu.com/usn/usn-3251-1
CVE-2017-7184

Package Information:
https://launchpad.net/ubuntu/+source/linux-hwe/4.8.0-45.48~16.04.1


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