ESB-2019.0716 - [Ubuntu] linux kernel: Multiple vulnerabilities 2019-03-07

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0716
                       Linux kernel vulnerabilities
                               7 March 2019

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

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

Product:           linux kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
                   Modify Arbitrary Files          -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6133 CVE-2018-18397 CVE-2018-16880

Reference:         ESB-2019.0691
                   ESB-2019.0670
                   ESB-2019.0609
                   ESB-2019.0291
                   ESB-2019.0231

Original Bulletin: 
   https://usn.ubuntu.com/3903-1/
   https://usn.ubuntu.com/3903-2/

Comment: This bulletin contains two (2) security advisories.

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

========================================================================
USN-3903-1: Linux kernel vulnerabilities
6 March 2019

linux, linux-azure, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities
========================================================================

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

  o Ubuntu 18.10

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  o linux - Linux kernel
  o linux-azure - Linux kernel for Microsoft Azure Cloud systems
  o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  o linux-kvm - Linux kernel for cloud environments
  o linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

Jason Wang discovered that the vhost net driver in the Linux kernel contained
an out of bounds write vulnerability. An attacker in a guest virtual machine
could use this to cause a denial of service (host system crash) or possibly
execute arbitrary code in the host kernel. (CVE-2018-16880)

Jann Horn discovered that the userfaultd implementation in the Linux kernel did
not properly restrict access to certain ioctls. A local attacker could use this
possibly to modify files. (CVE-2018-18397)

Jann Horn discovered a race condition in the fork() system call in the Linux
kernel. A local attacker could use this to gain access to services that cache
authorizations. (CVE-2019-6133)

Update instructions

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

Ubuntu 18.10
    linux-image-4.18.0-1007-gcp - 4.18.0-1007.8
    linux-image-4.18.0-1008-kvm - 4.18.0-1008.8
    linux-image-4.18.0-1010-raspi2 - 4.18.0-1010.12
    linux-image-4.18.0-1013-azure - 4.18.0-1013.13
    linux-image-4.18.0-16-generic - 4.18.0-16.17
    linux-image-4.18.0-16-generic-lpae - 4.18.0-16.17
    linux-image-4.18.0-16-lowlatency - 4.18.0-16.17
    linux-image-4.18.0-16-snapdragon - 4.18.0-16.17
    linux-image-azure - 4.18.0.1013.14
    linux-image-gcp - 4.18.0.1007.7
    linux-image-generic - 4.18.0.16.17
    linux-image-generic-lpae - 4.18.0.16.17
    linux-image-gke - 4.18.0.1007.7
    linux-image-kvm - 4.18.0.1008.8
    linux-image-lowlatency - 4.18.0.16.17
    linux-image-raspi2 - 4.18.0.1010.7
    linux-image-snapdragon - 4.18.0.16.17

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-2018-16880
  o CVE-2018-18397
  o CVE-2019-6133

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

========================================================================
USN-3903-2: Linux kernel (HWE) vulnerabilities
6 March 2019

linux-hwe, linux-azure vulnerabilities
========================================================================

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-azure - Linux kernel for Microsoft Azure Cloud systems
  o linux-hwe - Linux hardware enablement (HWE) kernel

Details

USN-3903-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.10. This
update provides the corresponding updates for the Linux Hardware Enablement
(HWE) kernel from Ubuntu 18.10 for Ubuntu 18.04 LTS.

Jason Wang discovered that the vhost net driver in the Linux kernel contained
an out of bounds write vulnerability. An attacker in a guest virtual machine
could use this to cause a denial of service (host system crash) or possibly
execute arbitrary code in the host kernel. (CVE-2018-16880)

Jann Horn discovered that the userfaultd implementation in the Linux kernel did
not properly restrict access to certain ioctls. A local attacker could use this
possibly to modify files. (CVE-2018-18397)

Jann Horn discovered a race condition in the fork() system call in the Linux
kernel. A local attacker could use this to gain access to services that cache
authorizations. (CVE-2019-6133)

Update instructions

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

Ubuntu 18.04 LTS
    linux-image-4.18.0-1013-azure - 4.18.0-1013.13~18.04.1
    linux-image-4.18.0-16-generic - 4.18.0-16.17~18.04.1
    linux-image-4.18.0-16-generic-lpae - 4.18.0-16.17~18.04.1
    linux-image-4.18.0-16-lowlatency - 4.18.0-16.17~18.04.1
    linux-image-4.18.0-16-snapdragon - 4.18.0-16.17~18.04.1
    linux-image-azure - 4.18.0.1013.12
    linux-image-generic-hwe-18.04 - 4.18.0.16.66
    linux-image-generic-lpae-hwe-18.04 - 4.18.0.16.66
    linux-image-lowlatency-hwe-18.04 - 4.18.0.16.66
    linux-image-snapdragon-hwe-18.04 - 4.18.0.16.66

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-3903-1
  o CVE-2018-16880
  o CVE-2018-18397
  o CVE-2019-6133

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

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