[USN-3776-2] Linux kernel (Xenial HWE) vulnerabilities


–===============7666150736727452228==
Content-Type: multipart/signed; micalg=pgp-sha512;
protocol=”application/pgp-signature”; boundary=”pY3vCvL1qV+PayAL”
Content-Disposition: inline

–pY3vCvL1qV+PayAL
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

==========================================================================
Ubuntu Security Notice USN-3776-2
October 01, 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-3776-1 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.

Jann Horn discovered that the vmacache subsystem did not properly handle
sequence number overflows, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

It was discovered that a NULL pointer dereference could be triggered in the
OCFS2 file system implementation in the Linux kernel. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2017-18216)

It was discovered that a race condition existed in the raw MIDI driver for
the Linux kernel, leading to a double free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2018-10902)

It was discovered that a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

It was discovered that the YUREX USB device driver for the Linux kernel did
not properly restrict user space reads or writes. A physically proximate
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-16276)

It was discovered that a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-4.4.0-1031-aws 4.4.0-1031.34
linux-image-4.4.0-137-generic 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-generic-lpae 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-lowlatency 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc-e500mc 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc-smp 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc64-emb 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc64-smp 4.4.0-137.163~14.04.1
linux-image-aws 4.4.0.1031.31
linux-image-generic-lpae-lts-xenial 4.4.0.137.117
linux-image-generic-lts-xenial 4.4.0.137.117
linux-image-lowlatency-lts-xenial 4.4.0.137.117
linux-image-powerpc-e500mc-lts-xenial 4.4.0.137.117
linux-image-powerpc-smp-lts-xenial 4.4.0.137.117
linux-image-powerpc64-emb-lts-xenial 4.4.0.137.117
linux-image-powerpc64-smp-lts-xenial 4.4.0.137.117

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-3776-2
https://usn.ubuntu.com/usn/usn-3776-1
CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572,
CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554,
CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1031.34
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-137.163~14.04.1

–pY3vCvL1qV+PayAL
Content-Type: application/pgp-signature; name=”signature.asc”

—–BEGIN PGP SIGNATURE—–
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=b6w2
—–END PGP SIGNATURE—–

–pY3vCvL1qV+PayAL–

–===============7666150736727452228==
Content-Type: text/plain; charset=”utf-8″
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline

LS0gCnVidW50dS1zZWN1cml0eS1hbm5vdW5jZSBtYWlsaW5nIGxpc3QKdWJ1bnR1LXNlY3VyaXR5
LWFubm91bmNlQGxpc3RzLnVidW50dS5jb20KTW9kaWZ5IHNldHRpbmdzIG9yIHVuc3Vic2NyaWJl
IGF0OiBodHRwczovL2xpc3RzLnVidW50dS5jb20vbWFpbG1hbi9saXN0aW5mby91YnVudHUtc2Vj
dXJpdHktYW5ub3VuY2UK

–===============7666150736727452228==–