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Ubuntu Security Notice USN-3582-2

Ubuntu Security Notice USN-3582-2
Posted Feb 22, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3582-2 - USN-3582-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Mohamed Ghannam discovered that the IPv4 raw socket implementation in the Linux kernel contained a race condition leading to uninitialized pointer usage. 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, vulnerability
systems | linux, ubuntu
advisories | CVE-2015-8952, CVE-2017-12190, CVE-2017-15115, CVE-2017-17712, CVE-2017-5715, CVE-2017-8824
MD5 | 587cb9ef4fb21c7488d73d97033aa051

Ubuntu Security Notice USN-3582-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3582-2
February 22, 2018

linux-lts-xenial, linux-aws vulnerabilities
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3582-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.

Mohamed Ghannam discovered that the IPv4 raw socket implementation in the
Linux kernel contained a race condition leading to uninitialized pointer
usage. A local attacker could use this to cause a denial of service or
possibly execute arbitrary code. (CVE-2017-17712)

Laurent Guerby discovered that the mbcache feature in the ext2 and ext4
filesystems in the Linux kernel improperly handled xattr block caching. A
local attacker could use this to cause a denial of service. (CVE-2015-8952)

Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel
did not properly track reference counts when merging buffers. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2017-12190)

ChunYu Wang discovered that a use-after-free vulnerability existed in the
SCTP protocol implementation in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code, (CVE-2017-15115)

Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP
protocol implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-8824)

USN-3540-2 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 14.04 LTS. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory. (CVE-2017-5715)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-4.4.0-1014-aws 4.4.0-1014.14
linux-image-4.4.0-116-generic 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-generic-lpae 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-lowlatency 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc-e500mc 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc-smp 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc64-emb 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc64-smp 4.4.0-116.140~14.04.1
linux-image-aws 4.4.0.1014.14
linux-image-generic-lpae-lts-xenial 4.4.0.116.98
linux-image-generic-lts-xenial 4.4.0.116.98
linux-image-lowlatency-lts-xenial 4.4.0.116.98
linux-image-powerpc-e500mc-lts-xenial 4.4.0.116.98
linux-image-powerpc-smp-lts-xenial 4.4.0.116.98
linux-image-powerpc64-emb-lts-xenial 4.4.0.116.98
linux-image-powerpc64-smp-lts-xenial 4.4.0.116.98

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://usn.ubuntu.com/usn/usn-3582-2
https://usn.ubuntu.com/usn/usn-3582-1
CVE-2015-8952, CVE-2017-12190, CVE-2017-15115, CVE-2017-17712,
CVE-2017-5715, CVE-2017-8824

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1014.14
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-116.140~14.04.1

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