ESB-2019.1125 - [Ubuntu] linux kernel: Multiple vulnerabilities 2019-04-03

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1125
                USN-3931-1/2: Linux kernel vulnerabilities
                               3 April 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           linux kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Access Privileged Data          -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-9213 CVE-2019-8980 CVE-2019-8912
                   CVE-2019-7308 CVE-2019-7222 CVE-2019-7221
                   CVE-2019-6974 CVE-2019-3460 CVE-2019-3459
                   CVE-2018-19824 CVE-2018-18021 CVE-2018-14678

Reference:         ESB-2019.1105
                   ESB-2019.1097
                   ESB-2019.1081
                   ESB-2019.1035
                   ESB-2019.1025.2
                   ESB-2019.1005

Original Bulletin: 
   https://usn.ubuntu.com/3931-1/
   https://usn.ubuntu.com/3931-2/

Comment: This bulletin contains two (2) advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-3931-1: Linux kernel vulnerabilities
2 April 2019

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

  o Ubuntu 18.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  o linux - Linux kernel
  o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  o linux-kvm - Linux kernel for cloud environments
  o linux-oem - Linux kernel for OEM processors
  o linux-oracle - Linux kernel for Oracle Cloud systems
  o linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not properly
set up all arguments to an error handler callback used when running as a
paravirtualized guest. An unprivileged attacker in a paravirtualized guest VM
could use this to cause a denial of service (guest VM crash). (CVE-2018-14678)

It was discovered that the KVM implementation in the Linux kernel on ARM 64bit
processors did not properly handle some ioctls. An attacker with the privilege
to create KVM-based virtual machines could use this to cause a denial of
service (host system crash) or execute arbitrary code in the host.
(CVE-2018-18021)

Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the
Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2018-19824)

Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak
in the Bluetooth implementation of the Linux kernel. An attacker within
Bluetooth range could use this to expose sensitive information (kernel memory).
(CVE-2019-3459, CVE-2019-3460)

Jann Horn discovered that the KVM implementation in the Linux kernel contained
a use-after-free vulnerability. An attacker in a guest VM with access to /dev/
kvm could use this to cause a denial of service (guest VM crash).
(CVE-2019-6974)

Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the
KVM subsystem of the Linux kernel, when using nested virtual machines. A local
attacker in a guest VM could use this to cause a denial of service (system
crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)

Felix Wilhelm discovered that an information leak vulnerability existed in the
KVM subsystem of the Linux kernel, when nested virtualization is used. A local
attacker could use this to expose sensitive information (host system memory to
a guest VM). (CVE-2019-7222)

Jann Horn discovered that the eBPF implementation in the Linux kernel was
insufficiently hardened against Spectre V1 attacks. A local attacker could use
this to expose sensitive information. (CVE-2019-7308)

It was discovered that a use-after-free vulnerability existed in the user-
space API for crypto (af_alg) 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-2019-8912)

It was discovered that the Linux kernel did not properly deallocate memory when
handling certain errors while reading files. A local attacker could use this to
cause a denial of service (excessive memory consumption). (CVE-2019-8980)

Jann Horn discovered that the mmap implementation in the Linux kernel did not
properly check for the mmap minimum address in some situations. A local
attacker could use this to assist exploiting a kernel NULL pointer dereference
vulnerability. (CVE-2019-9213)

Update instructions

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

Ubuntu 18.04 LTS
    linux-image-4.15.0-1010-oracle - 4.15.0-1010.12
    linux-image-4.15.0-1029-gcp - 4.15.0-1029.31
    linux-image-4.15.0-1031-kvm - 4.15.0-1031.31
    linux-image-4.15.0-1033-raspi2 - 4.15.0-1033.35
    linux-image-4.15.0-1035-aws - 4.15.0-1035.37
    linux-image-4.15.0-1035-oem - 4.15.0-1035.40
    linux-image-4.15.0-47-generic - 4.15.0-47.50
    linux-image-4.15.0-47-generic-lpae - 4.15.0-47.50
    linux-image-4.15.0-47-lowlatency - 4.15.0-47.50
    linux-image-4.15.0-47-snapdragon - 4.15.0-47.50
    linux-image-aws - 4.15.0.1035.34
    linux-image-gcp - 4.15.0.1029.31
    linux-image-generic - 4.15.0.47.49
    linux-image-generic-lpae - 4.15.0.47.49
    linux-image-gke - 4.15.0.1029.31
    linux-image-kvm - 4.15.0.1031.31
    linux-image-lowlatency - 4.15.0.47.49
    linux-image-oem - 4.15.0.1035.40
    linux-image-oracle - 4.15.0.1010.13
    linux-image-raspi2 - 4.15.0.1033.31
    linux-image-snapdragon - 4.15.0.47.49
    linux-image-virtual - 4.15.0.47.49

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

  o CVE-2018-14678
  o CVE-2018-18021
  o CVE-2018-19824
  o CVE-2019-3459
  o CVE-2019-3460
  o CVE-2019-6974
  o CVE-2019-7221
  o CVE-2019-7222
  o CVE-2019-7308
  o CVE-2019-8912
  o CVE-2019-8980
  o CVE-2019-9213

- ------------------------------------------------------------------------------

USN-3931-2: Linux kernel (HWE) vulnerabilities
2 April 2019

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

  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  o linux-azure - Linux kernel for Microsoft Azure Cloud systems
  o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  o linux-hwe - Linux hardware enablement (HWE) kernel
  o linux-oracle - Linux kernel for Oracle Cloud systems

Details

USN-3931-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This
update provides the corresponding updates for the Linux Hardware Enablement
(HWE) kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS and for the Linux Azure
kernel for Ubuntu 14.04 LTS.

M. Vefa Bicakci and Andy Lutomirski discovered that the kernel did not properly
set up all arguments to an error handler callback used when running as a
paravirtualized guest. An unprivileged attacker in a paravirtualized guest VM
could use this to cause a denial of service (guest VM crash). (CVE-2018-14678)

It was discovered that the KVM implementation in the Linux kernel on ARM 64bit
processors did not properly handle some ioctls. An attacker with the privilege
to create KVM-based virtual machines could use this to cause a denial of
service (host system crash) or execute arbitrary code in the host.
(CVE-2018-18021)

Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the
Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2018-19824)

Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak
in the Bluetooth implementation of the Linux kernel. An attacker within
Bluetooth range could use this to expose sensitive information (kernel memory).
(CVE-2019-3459, CVE-2019-3460)

Jann Horn discovered that the KVM implementation in the Linux kernel contained
a use-after-free vulnerability. An attacker in a guest VM with access to /dev/
kvm could use this to cause a denial of service (guest VM crash).
(CVE-2019-6974)

Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the
KVM subsystem of the Linux kernel, when using nested virtual machines. A local
attacker in a guest VM could use this to cause a denial of service (system
crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)

Felix Wilhelm discovered that an information leak vulnerability existed in the
KVM subsystem of the Linux kernel, when nested virtualization is used. A local
attacker could use this to expose sensitive information (host system memory to
a guest VM). (CVE-2019-7222)

Jann Horn discovered that the eBPF implementation in the Linux kernel was
insufficiently hardened against Spectre V1 attacks. A local attacker could use
this to expose sensitive information. (CVE-2019-7308)

It was discovered that a use-after-free vulnerability existed in the user-
space API for crypto (af_alg) 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-2019-8912)

It was discovered that the Linux kernel did not properly deallocate memory when
handling certain errors while reading files. A local attacker could use this to
cause a denial of service (excessive memory consumption). (CVE-2019-8980)

Jann Horn discovered that the mmap implementation in the Linux kernel did not
properly check for the mmap minimum address in some situations. A local
attacker could use this to assist exploiting a kernel NULL pointer dereference
vulnerability. (CVE-2019-9213)

Update instructions

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

Ubuntu 16.04 LTS
    linux-image-4.15.0-1010-oracle - 4.15.0-1010.12~16.04.1
    linux-image-4.15.0-1029-gcp - 4.15.0-1029.31~16.04.1
    linux-image-4.15.0-1035-aws - 4.15.0-1035.37~16.04.1
    linux-image-4.15.0-1041-azure - 4.15.0-1041.45
    linux-image-4.15.0-47-generic - 4.15.0-47.50~16.04.1
    linux-image-4.15.0-47-generic-lpae - 4.15.0-47.50~16.04.1
    linux-image-4.15.0-47-lowlatency - 4.15.0-47.50~16.04.1
    linux-image-aws-hwe - 4.15.0.1035.35
    linux-image-azure - 4.15.0.1041.45
    linux-image-gcp - 4.15.0.1029.43
    linux-image-generic-hwe-16.04 - 4.15.0.47.68
    linux-image-generic-lpae-hwe-16.04 - 4.15.0.47.68
    linux-image-gke - 4.15.0.1029.43
    linux-image-lowlatency-hwe-16.04 - 4.15.0.47.68
    linux-image-oem - 4.15.0.47.68
    linux-image-oracle - 4.15.0.1010.4
    linux-image-virtual-hwe-16.04 - 4.15.0.47.68
Ubuntu 14.04 LTS
    linux-image-4.15.0-1041-azure - 4.15.0-1041.45~14.04.1
    linux-image-azure - 4.15.0.1041.28

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

  o USN-3931-1
  o CVE-2018-14678
  o CVE-2018-18021
  o CVE-2018-19824
  o CVE-2019-3459
  o CVE-2019-3460
  o CVE-2019-6974
  o CVE-2019-7221
  o CVE-2019-7222
  o CVE-2019-7308
  o CVE-2019-8912
  o CVE-2019-8980
  o CVE-2019-9213

- --------------------------END INCLUDED TEXT--------------------

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