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Ubuntu Security Notice USN-3161-1

Ubuntu Security Notice USN-3161-1
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3161-1 - Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information. It was discovered that the Video For Linux Two implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC_DQBUF ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-9555
SHA-256 | d02ed1312a4662e3772b03a3dd3c24630bbaf9000053e2e30980817c514b43e8

Ubuntu Security Notice USN-3161-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3161-1
December 20, 2016

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

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the
TTY implementation in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2015-8964)

It was discovered that the Video For Linux Two (v4l2) implementation in the
Linux kernel did not properly handle multiple planes when processing a
VIDIOC_DQBUF ioctl(). A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2016-4568)

CAI Qian discovered that shared bind mounts in a mount namespace
exponentially added entries without restriction to the Linux kernel's mount
table. A local attacker could use this to cause a denial of service (system
crash). (CVE-2016-6213)

It was discovered that the KVM implementation for x86/x86_64 in the Linux
kernel could dereference a null pointer. An attacker in a guest virtual
machine could use this to cause a denial of service (system crash) in the
KVM host. (CVE-2016-8630)

Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation
in the Linux kernel contained a buffer overflow when handling fragmented
packets. A remote attacker could use this to possibly execute arbitrary
code with administrative privileges. (CVE-2016-8633)

Marco Grassi discovered that the TCP implementation in the Linux kernel
mishandles socket buffer (skb) truncation. A local attacker could use this
to cause a denial of service (system crash). (CVE-2016-8645)

Andrey Konovalov discovered that the SCTP implementation in the Linux
kernel improperly handled validation of incoming data. A remote attacker
could use this to cause a denial of service (system crash). (CVE-2016-9555)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-57-generic 4.4.0-57.78
linux-image-4.4.0-57-generic-lpae 4.4.0-57.78
linux-image-4.4.0-57-lowlatency 4.4.0-57.78
linux-image-4.4.0-57-powerpc-e500mc 4.4.0-57.78
linux-image-4.4.0-57-powerpc-smp 4.4.0-57.78
linux-image-4.4.0-57-powerpc64-emb 4.4.0-57.78
linux-image-4.4.0-57-powerpc64-smp 4.4.0-57.78
linux-image-generic 4.4.0.57.60
linux-image-generic-lpae 4.4.0.57.60
linux-image-lowlatency 4.4.0.57.60
linux-image-powerpc-e500mc 4.4.0.57.60
linux-image-powerpc-smp 4.4.0.57.60
linux-image-powerpc64-emb 4.4.0.57.60
linux-image-powerpc64-smp 4.4.0.57.60

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.
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-3161-1
CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630,
CVE-2016-8633, CVE-2016-8645, CVE-2016-9555

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-57.78

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