[USN-3312-1] Linux kernel vulnerabilities

Wed Jun 7 05:55:34 UTC 2017

==========================================================================
Ubuntu Security Notice USN-3312-1
June 07, 2017

linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon Processors

Details:

It was discovered that the netfilter netlink implementation in the Linux
kernel did not properly validate batch messages. A local attacker with the
CAP_NET_ADMIN capability could use this to expose sensitive information or
cause a denial of service. (CVE-2016-7917)

Qian Zhang discovered a heap-based buffer overflow in the tipc_msg_build()
function in the Linux kernel. A local attacker could use to cause a denial
of service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2016-8632)

It was discovered that the keyring implementation in the Linux kernel in
some situations did not prevent special internal keyrings from being joined
by userspace keyrings. A privileged local attacker could use this to bypass
module verification. (CVE-2016-9604)

It was discovered that a buffer overflow existed in the trace subsystem in
the Linux kernel. A privileged local attacker could use this to execute
arbitrary code. (CVE-2017-0605)

Dmitry Vyukov discovered that KVM implementation in the Linux kernel
improperly emulated the VMXON instruction. A local attacker in a guest OS
could use this to cause a denial of service (memory consumption) in the
host OS. (CVE-2017-2596)

Daniel Jiang discovered that a race condition existed in the ipv4 ping
socket implementation in the Linux kernel. A local privileged attacker
could use this to cause a denial of service (system crash). (CVE-2017-2671)

Di Shen discovered that a race condition existed in the perf subsystem of
the Linux kernel. A local attacker could use this to cause a denial of
service or possibly gain administrative privileges. (CVE-2017-6001)

Eric Biggers discovered a memory leak in the keyring implementation in the
Linux kernel. A local attacker could use this to cause a denial of service
(memory consumption). (CVE-2017-7472)

Sabrina Dubroca discovered that the asynchronous cryptographic hash (ahash)
implementation in the Linux kernel did not properly handle a full request
queue. A local attacker could use this to cause a denial of service
(infinite recursion). (CVE-2017-7618)

Tuomas Haanpää and Ari Kauppi discovered that the NFSv2 and NFSv3 server
implementations in the Linux kernel did not properly handle certain long
RPC replies. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2017-7645)

Tommi Rantala and Brad Spengler discovered that the memory manager in the
Linux kernel did not properly enforce the CONFIG_STRICT_DEVMEM protection
mechanism. A local attacker with access to /dev/mem could use this to
expose sensitive information or possibly execute arbitrary code.
(CVE-2017-7889)

Tuomas Haanpää and Ari Kauppi discovered that the NFSv2 and NFSv3 server
implementations in the Linux kernel did not properly check for the end of
buffer. A remote attacker could use this to craft requests that cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2017-7895)

It was discovered that a use-after-free vulnerability existed in the device
driver for XCeive xc2028/xc3028 tuners in the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2016-7913)

Vlad Tsyrklevich discovered an integer overflow vulnerability in the VFIO
PCI driver for the Linux kernel. A local attacker with access to a vfio PCI
device file could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2016-9083, CVE-2016-9084)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1014-gke      4.4.0-1014.14
  linux-image-4.4.0-1018-aws      4.4.0-1018.27
  linux-image-4.4.0-1057-raspi2   4.4.0-1057.64
  linux-image-4.4.0-1059-snapdragon  4.4.0-1059.63
  linux-image-4.4.0-79-generic    4.4.0-79.100
  linux-image-4.4.0-79-generic-lpae  4.4.0-79.100
  linux-image-4.4.0-79-lowlatency  4.4.0-79.100
  linux-image-4.4.0-79-powerpc-e500mc  4.4.0-79.100
  linux-image-4.4.0-79-powerpc-smp  4.4.0-79.100
  linux-image-4.4.0-79-powerpc64-smp  4.4.0-79.100
  linux-image-aws                 4.4.0.1018.21
  linux-image-generic             4.4.0.79.85
  linux-image-generic-lpae        4.4.0.79.85
  linux-image-gke                 4.4.0.1014.16
  linux-image-lowlatency          4.4.0.79.85
  linux-image-powerpc-e500mc      4.4.0.79.85
  linux-image-powerpc-smp         4.4.0.79.85
  linux-image-powerpc64-emb       4.4.0.79.85
  linux-image-powerpc64-smp       4.4.0.79.85
  linux-image-raspi2              4.4.0.1057.58
  linux-image-snapdragon          4.4.0.1059.52
  linux-image-virtual             4.4.0.79.85

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:
  https://www.ubuntu.com/usn/usn-3312-1
  CVE-2016-7913, CVE-2016-7917, CVE-2016-8632, CVE-2016-9083,
  CVE-2016-9084, CVE-2016-9604, CVE-2017-0605, CVE-2017-2596,
  CVE-2017-2671, CVE-2017-6001, CVE-2017-7472, CVE-2017-7618,
  CVE-2017-7645, CVE-2017-7889, CVE-2017-7895

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-79.100
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1018.27
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1014.14
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1057.64
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1059.63

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