[USN-4094-1] Linux kernel vulnerabilities

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[USN-4094-1] Linux kernel vulnerabilities

Steve Beattie
==========================================================================
Ubuntu Security Notice USN-4094-1
August 13, 2019

linux, linux-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-kvm,
linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oem: Linux kernel for OEM processors
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the alarmtimer implementation in the Linux kernel
contained an integer overflow vulnerability. A local attacker could use
this to cause a denial of service. (CVE-2018-13053)

Wen Xu discovered that the XFS filesystem implementation in the Linux
kernel did not properly track inode validations. An attacker could use this
to construct a malicious XFS image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-13093)

Wen Xu discovered that the f2fs file system implementation in the
Linux kernel did not properly validate metadata. An attacker could
use this to construct a malicious f2fs image that, when mounted,
could cause a denial of service (system crash). (CVE-2018-13097,
CVE-2018-13099, CVE-2018-13100, CVE-2018-14614, CVE-2018-14616,
CVE-2018-13096, CVE-2018-13098, CVE-2018-14615)

Wen Xu and Po-Ning Tseng discovered that btrfs file system
implementation in the Linux kernel did not properly validate
metadata. An attacker could use this to construct a malicious
btrfs image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-14610, CVE-2018-14611, CVE-2018-14612,
CVE-2018-14613, CVE-2018-14609)

Wen Xu discovered that the HFS+ filesystem implementation in the Linux
kernel did not properly handle malformed catalog data in some situations.
An attacker could use this to construct a malicious HFS+ image that, when
mounted, could cause a denial of service (system crash). (CVE-2018-14617)

Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem
of the Linux kernel did not properly initialize new files in some
situations. A local attacker could use this to expose sensitive
information. (CVE-2018-16862)

Hui Peng and Mathias Payer discovered that the USB subsystem in the Linux
kernel did not properly handle size checks when handling an extra USB
descriptor. A physically proximate attacker could use this to cause a
denial of service (system crash). (CVE-2018-20169)

It was discovered that a use-after-free error existed in the block layer
subsystem of the Linux kernel when certain failure conditions occurred. A
local attacker could possibly use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-20856)

Eli Biham and Lior Neumann discovered that the Bluetooth implementation in
the Linux kernel did not properly validate elliptic curve parameters during
Diffie-Hellman key exchange in some situations. An attacker could use this
to expose sensitive information. (CVE-2018-5383)

It was discovered that a heap buffer overflow existed in the Marvell
Wireless LAN device driver for the Linux kernel. An attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2019-10126)

Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors
incorrectly handle SWAPGS instructions during speculative execution. A
local attacker could use this to expose sensitive information (kernel
memory). (CVE-2019-1125)

It was discovered that the PowerPC dlpar implementation in the Linux kernel
did not properly check for allocation errors in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-12614)

It was discovered that a NULL pointer dereference vulnerabilty existed in
the Near-field communication (NFC) implementation in the Linux kernel. An
attacker could use this to cause a denial of service (system crash).
(CVE-2019-12818)

It was discovered that the MDIO bus devices subsystem in the Linux kernel
improperly dropped a device reference in an error condition, leading to a
use-after-free. An attacker could use this to cause a denial of service
(system crash). (CVE-2019-12819)

It was discovered that a NULL pointer dereference vulnerability existed in
the Near-field communication (NFC) implementation in the Linux kernel. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2019-12984)

Jann Horn discovered a use-after-free vulnerability in the Linux kernel
when accessing LDT entries in some situations. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-13233)

Jann Horn discovered that the ptrace implementation in the Linux kernel did
not properly record credentials in some situations. A local attacker could
use this to cause a denial of service (system crash) or possibly gain
administrative privileges. (CVE-2019-13272)

It was discovered that the Empia EM28xx DVB USB device driver
implementation in the Linux kernel contained a use-after-free vulnerability
when disconnecting the device. An attacker could use this to cause a denial
of service (system crash). (CVE-2019-2024)

It was discovered that the USB video device class implementation in the
Linux kernel did not properly validate control bits, resulting in an out of
bounds buffer read. A local attacker could use this to possibly expose
sensitive information (kernel memory). (CVE-2019-2101)

It was discovered that the Marvell Wireless LAN device driver in the Linux
kernel did not properly validate the BSS descriptor. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-3846)

It was discovered that the Appletalk IP encapsulation driver in the Linux
kernel did not properly prevent kernel addresses from being copied to user
space. A local attacker with the CAP_NET_ADMIN capability could use this to
expose sensitive information. (CVE-2018-20511)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1021-oracle  4.15.0-1021.23
  linux-image-4.15.0-1040-gcp     4.15.0-1040.42
  linux-image-4.15.0-1040-gke     4.15.0-1040.42
  linux-image-4.15.0-1042-kvm     4.15.0-1042.42
  linux-image-4.15.0-1043-raspi2  4.15.0-1043.46
  linux-image-4.15.0-1050-oem     4.15.0-1050.57
  linux-image-4.15.0-1060-snapdragon  4.15.0-1060.66
  linux-image-4.15.0-58-generic   4.15.0-58.64
  linux-image-4.15.0-58-generic-lpae  4.15.0-58.64
  linux-image-4.15.0-58-lowlatency  4.15.0-58.64
  linux-image-gcp                 4.15.0.1040.42
  linux-image-generic             4.15.0.58.60
  linux-image-generic-lpae        4.15.0.58.60
  linux-image-gke                 4.15.0.1040.43
  linux-image-gke-4.15            4.15.0.1040.43
  linux-image-kvm                 4.15.0.1042.42
  linux-image-lowlatency          4.15.0.58.60
  linux-image-oem                 4.15.0.1050.54
  linux-image-oracle              4.15.0.1021.24
  linux-image-powerpc-e500mc      4.15.0.58.60
  linux-image-powerpc-smp         4.15.0.58.60
  linux-image-powerpc64-emb       4.15.0.58.60
  linux-image-powerpc64-smp       4.15.0.58.60
  linux-image-raspi2              4.15.0.1043.41
  linux-image-snapdragon          4.15.0.1060.63
  linux-image-virtual             4.15.0.58.60

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1021-oracle  4.15.0-1021.23~16.04.1
  linux-image-4.15.0-1040-gcp     4.15.0-1040.42~16.04.1
  linux-image-4.15.0-1055-azure   4.15.0-1055.60
  linux-image-4.15.0-58-generic   4.15.0-58.64~16.04.1
  linux-image-4.15.0-58-generic-lpae  4.15.0-58.64~16.04.1
  linux-image-4.15.0-58-lowlatency  4.15.0-58.64~16.04.1
  linux-image-azure               4.15.0.1055.58
  linux-image-gcp                 4.15.0.1040.54
  linux-image-generic-hwe-16.04   4.15.0.58.79
  linux-image-generic-lpae-hwe-16.04  4.15.0.58.79
  linux-image-gke                 4.15.0.1040.54
  linux-image-lowlatency-hwe-16.04  4.15.0.58.79
  linux-image-oem                 4.15.0.58.79
  linux-image-oracle              4.15.0.1021.15
  linux-image-virtual-hwe-16.04   4.15.0.58.79

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/4094-1
  CVE-2018-13053, CVE-2018-13093, CVE-2018-13096, CVE-2018-13097,
  CVE-2018-13098, CVE-2018-13099, CVE-2018-13100, CVE-2018-14609,
  CVE-2018-14610, CVE-2018-14611, CVE-2018-14612, CVE-2018-14613,
  CVE-2018-14614, CVE-2018-14615, CVE-2018-14616, CVE-2018-14617,
  CVE-2018-16862, CVE-2018-20169, CVE-2018-20511, CVE-2018-20856,
  CVE-2018-5383, CVE-2019-10126, CVE-2019-1125, CVE-2019-12614,
  CVE-2019-12818, CVE-2019-12819, CVE-2019-12984, CVE-2019-13233,
  CVE-2019-13272, CVE-2019-2024, CVE-2019-2101, CVE-2019-3846

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-58.64
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1040.42
  https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1040.42
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1042.42
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1050.57
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1021.23
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1043.46
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1060.66
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1055.60
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1040.42~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-58.64~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1021.23~16.04.1


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