USN-4094-1: Linux kernel vulnerabilities

2019-08-14 KENNETH Ubuntu security 0

USN-4094-1: Linux kernel vulnerabilities

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

Source: USN-4094-1: Linux kernel vulnerabilities

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