ESB-2019.0253.3 - UPDATE [Ubuntu] kernel: Multiple vulnerabilities 2019-02-08

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

                              ESB-2019.0253.3
                       Linux kernel vulnerabilities
                              8 February 2019

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

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

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise        -- Existing Account
                   Increased Privileges   -- Existing Account
                   Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19407 CVE-2018-18281 CVE-2018-17972
                   CVE-2018-16882 CVE-2018-14625 CVE-2018-10883
                   CVE-2018-10882 CVE-2018-10880 CVE-2018-10879
                   CVE-2018-10878 CVE-2018-10877 CVE-2018-10876
                   CVE-2018-9516  

Reference:         ESB-2019.0138
                   ESB-2018.3645
                   ESB-2018.3584

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3871-1
   http://www.ubuntu.com/usn/usn-3871-2
   http://www.ubuntu.com/usn/usn-3871-3
   http://www.ubuntu.com/usn/usn-3871-4
   http://www.ubuntu.com/usn/usn-3871-5

Comment: This bulletin contains five (5) Ubuntu security advisories.

Revision History:  February  8 2019: Added USN-3871-5 for Azure kernels
                   February  5 2019: USN-3871-2 to USN-3871-4 added 
				     (regression fix + other releases)
                   January  30 2019: Initial Release

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

==========================================================================
Ubuntu Security Notice USN-3871-1
January 29, 2019

linux vulnerabilities
==========================================================================

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

- - Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- - linux: Linux kernel

Details:

Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)

Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)

Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)

It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)

Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)

It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-44-generic   4.15.0-44.47
  linux-image-4.15.0-44-generic-lpae  4.15.0-44.47
  linux-image-4.15.0-44-lowlatency  4.15.0-44.47
  linux-image-4.15.0-44-snapdragon  4.15.0-44.47
  linux-image-generic             4.15.0.44.46
  linux-image-generic-lpae        4.15.0.44.46
  linux-image-lowlatency          4.15.0.44.46
  linux-image-snapdragon          4.15.0.44.46

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-3871-1
  CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
  CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
  CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
  CVE-2018-9516

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-44.47

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

==========================================================================
Ubuntu Security Notice USN-3871-2
January 31, 2019

linux regression
==========================================================================

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

- - Ubuntu 18.04 LTS

Summary:

Multiple regressions were fixed in the Linux kernel.

Software Description:
- - linux: Linux kernel

Details:

USN-3871-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. Unfortunately, that update introduced regressions with docking
station displays and mounting ext4 file systems with the meta_bg
option enabled. This update fixes the problems.

We apologize for the inconvenience.

Original advisory details:

 Wen Xu discovered that a use-after-free vulnerability existed in the ext4
 filesystem implementation in the Linux kernel. An attacker could use this
 to construct a malicious ext4 image that, when mounted, could cause a
 denial of service (system crash) or possibly execute arbitrary code.
 (CVE-2018-10876, CVE-2018-10879)

 Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
 implementation in the Linux kernel. An attacker could use this to construct
 a malicious ext4 image that, when mounted, could cause a denial of service
 (system crash) or possibly execute arbitrary code. (CVE-2018-10877)

 Wen Xu discovered that an out-of-bounds write vulnerability existed in the
 ext4 filesystem implementation in the Linux kernel. An attacker could use
 this to construct a malicious ext4 image that, when mounted, could cause a
 denial of service (system crash) or possibly execute arbitrary code.
 (CVE-2018-10878, CVE-2018-10882)

 Wen Xu discovered that the ext4 filesystem implementation in the Linux
 kernel did not properly ensure that xattr information remained in inode
 bodies. An attacker could use this to construct a malicious ext4 image
 that, when mounted, could cause a denial of service (system crash).
 (CVE-2018-10880)

 Wen Xu discovered that the ext4 file system implementation in the Linux
 kernel could possibly perform an out of bounds write when updating the
 journal for an inline file. An attacker could use this to construct a
 malicious ext4 image that, when mounted, could cause a denial of service
 (system crash). (CVE-2018-10883)

 It was discovered that a race condition existed in the vsock address family
 implementation of the Linux kernel that could lead to a use-after-free
 condition. A local attacker in a guest virtual machine could use this to
 expose sensitive information (host machine kernel memory). (CVE-2018-14625)

 Cfir Cohen discovered that a use-after-free vulnerability existed in the
 KVM implementation of the Linux kernel, when handling interrupts in
 environments where nested virtualization is in use (nested KVM
 virtualization is not enabled by default in Ubuntu kernels). A local
 attacker in a guest VM could possibly use this to gain administrative
 privileges in a host machine. (CVE-2018-16882)

 Jann Horn discovered that the procfs file system implementation in the
 Linux kernel did not properly restrict the ability to inspect the kernel
 stack of an arbitrary task. A local attacker could use this to expose
 sensitive information. (CVE-2018-17972)

 Jann Horn discovered that the mremap() system call in the Linux kernel did
 not properly flush the TLB when completing, potentially leaving access to a
 physical page after it has been released to the page allocator. A local
 attacker could use this to cause a denial of service (system crash), expose
 sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

 Wei Wu discovered that the KVM implementation in the Linux kernel did not
 properly ensure that ioapics were initialized. A local attacker could use
 this to cause a denial of service (system crash). (CVE-2018-19407)

 It was discovered that the debug interface for the Linux kernel's HID
 subsystem did not properly perform bounds checking in some situations. An
 attacker with access to debugfs could use this to cause a denial of service
 or possibly gain additional privileges. (CVE-2018-9516)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-45-generic   4.15.0-45.48
  linux-image-4.15.0-45-generic-lpae  4.15.0-45.48
  linux-image-4.15.0-45-lowlatency  4.15.0-45.48
  linux-image-4.15.0-45-snapdragon  4.15.0-45.48
  linux-image-generic             4.15.0.45.47
  linux-image-generic-lpae        4.15.0.45.47
  linux-image-lowlatency          4.15.0.45.47
  linux-image-snapdragon          4.15.0.45.47

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-3871-2
  https://usn.ubuntu.com/usn/usn-3871-1
  https://launchpad.net/bugs/1813663, https://launchpad.net/bugs/1813727

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-45.48

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

==========================================================================
Ubuntu Security Notice USN-3871-3
February 04, 2019

linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
==========================================================================

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

- - Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

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

Details:

Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)

Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)

Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)

It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)

Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)

It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1027-gcp     4.15.0-1027.28
  linux-image-4.15.0-1029-kvm     4.15.0-1029.29
  linux-image-4.15.0-1031-raspi2  4.15.0-1031.33
  linux-image-4.15.0-1032-aws     4.15.0-1032.34
  linux-image-4.15.0-1033-oem     4.15.0-1033.38
  linux-image-aws                 4.15.0.1032.31
  linux-image-gcp                 4.15.0.1027.29
  linux-image-gke                 4.15.0.1027.29
  linux-image-kvm                 4.15.0.1029.29
  linux-image-oem                 4.15.0.1033.38
  linux-image-raspi2              4.15.0.1031.29

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-3871-3
  https://usn.ubuntu.com/usn/usn-3871-1
  CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
  CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
  CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
  CVE-2018-9516

Package Information:
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1032.34
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1027.28
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1029.29
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1033.38
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1031.33

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

==========================================================================
Ubuntu Security Notice USN-3871-4
February 04, 2019

linux-hwe, linux-aws-hwe, linux-gcp vulnerabilities
==========================================================================

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

- - Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- - linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3871-1 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.

Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this
to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10876, CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct
a malicious ext4 image that, when mounted, could cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2018-10877)

Wen Xu discovered that an out-of-bounds write vulnerability existed in the
ext4 filesystem implementation in the Linux kernel. An attacker could use
this to construct a malicious ext4 image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-10878, CVE-2018-10882)

Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly ensure that xattr information remained in inode
bodies. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10880)

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel could possibly perform an out of bounds write when updating the
journal for an inline file. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service
(system crash). (CVE-2018-10883)

It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to
expose sensitive information (host machine kernel memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in the
KVM implementation of the Linux kernel, when handling interrupts in
environments where nested virtualization is in use (nested KVM
virtualization is not enabled by default in Ubuntu kernels). A local
attacker in a guest VM could possibly use this to gain administrative
privileges in a host machine. (CVE-2018-16882)

Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-19407)

It was discovered that the debug interface for the Linux kernel's HID
subsystem did not properly perform bounds checking in some situations. An
attacker with access to debugfs could use this to cause a denial of service
or possibly gain additional privileges. (CVE-2018-9516)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1027-gcp     4.15.0-1027.28~16.04.1
  linux-image-4.15.0-1032-aws     4.15.0-1032.34~16.04.1
  linux-image-4.15.0-45-generic   4.15.0-45.48~16.04.1
  linux-image-4.15.0-45-generic-lpae  4.15.0-45.48~16.04.1
  linux-image-4.15.0-45-lowlatency  4.15.0-45.48~16.04.1
  linux-image-aws-hwe             4.15.0.1032.33
  linux-image-gcp                 4.15.0.1027.41
  linux-image-generic-hwe-16.04   4.15.0.45.66
  linux-image-generic-lpae-hwe-16.04  4.15.0.45.66
  linux-image-gke                 4.15.0.1027.41
  linux-image-lowlatency-hwe-16.04  4.15.0.45.66
  linux-image-oem                 4.15.0.45.66
  linux-image-virtual-hwe-16.04   4.15.0.45.66

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-3871-4
  https://usn.ubuntu.com/usn/usn-3871-1
  CVE-2018-10876, CVE-2018-10877, CVE-2018-10878, CVE-2018-10879,
  CVE-2018-10880, CVE-2018-10882, CVE-2018-10883, CVE-2018-14625,
  CVE-2018-16882, CVE-2018-17972, CVE-2018-18281, CVE-2018-19407,
  CVE-2018-9516

Package Information:
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1032.34~16.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1027.28~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-45.48~16.04.1

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

USN-3871-5: Linux kernel (Azure) vulnerabilities

7 February 2019
linux-azure vulnerabilities

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

    Ubuntu 18.04 LTS
    Ubuntu 16.04 LTS
    Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

    linux-azure - Linux kernel for Microsoft Azure Cloud systems

Details

Wen Xu discovered that a use-after-free vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this to
construct a malicious ext4 image that, when mounted, could cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2018-10876,
CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
implementation in the Linux kernel. An attacker could use this to construct a
malicious ext4 image that, when mounted, could cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-10877)

Wen Xu discovered that an out-of-bounds write vulnerability existed in the ext4
filesystem implementation in the Linux kernel. An attacker could use this to
construct a malicious ext4 image that, when mounted, could cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2018-10878,
CVE-2018-10882)

Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel
did not properly ensure that xattr information remained in inode bodies. An
attacker could use this to construct a malicious ext4 image that, when mounted,
could cause a denial of service (system crash). (CVE-2018-10880)

Wen Xu discovered that the ext4 file system implementation in the Linux kernel
could possibly perform an out of bounds write when updating the journal for an
inline file. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash).
(CVE-2018-10883)

It was discovered that a race condition existed in the vsock address family
implementation of the Linux kernel that could lead to a use-after-free
condition. A local attacker in a guest virtual machine could use this to expose
sensitive information (host machine kernel memory). (CVE-2018-14625)

Cfir Cohen discovered that a use-after-free vulnerability existed in the KVM
implementation of the Linux kernel, when handling interrupts in environments
where nested virtualization is in use (nested KVM virtualization is not enabled
by default in Ubuntu kernels). A local attacker in a guest VM could possibly use
this to gain administrative privileges in a host machine. (CVE-2018-16882)

Jann Horn discovered that the procfs file system implementation in the Linux
kernel did not properly restrict the ability to inspect the kernel stack of an
arbitrary task. A local attacker could use this to expose sensitive information.
(CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did not
properly flush the TLB when completing, potentially leaving access to a physical
page after it has been released to the page allocator. A local attacker could
use this to cause a denial of service (system crash), expose sensitive
information, or possibly execute arbitrary code. (CVE-2018-18281)

Wei Wu discovered that the KVM implementation in the Linux kernel did not
properly ensure that ioapics were initialized. A local attacker could use this
to cause a denial of service (system crash). (CVE-2018-19407)

It was discovered that the debug interface for the Linux kernel's HID subsystem
did not properly perform bounds checking in some situations. An attacker with
access to debugfs could use this to cause a denial of service or possibly gain
additional privileges. (CVE-2018-9516)

Update instructions

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

Ubuntu 18.04 LTS
    linux-image-4.15.0-1037-azure - 4.15.0-1037.39
    linux-image-azure - 4.15.0.1037.37
Ubuntu 16.04 LTS
    linux-image-4.15.0-1037-azure - 4.15.0-1037.39~16.04.1
    linux-image-azure - 4.15.0.1037.42
Ubuntu 14.04 LTS
    linux-image-4.15.0-1037-azure - 4.15.0-1037.39~14.04.2
    linux-image-azure - 4.15.0.1037.24

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

    USN-3871-1
    CVE-2018-10876
    CVE-2018-10877
    CVE-2018-10878
    CVE-2018-10879
    CVE-2018-10880
    CVE-2018-10882
    CVE-2018-10883
    CVE-2018-14625
    CVE-2018-16882
    CVE-2018-17972
    CVE-2018-18281
    CVE-2018-19407
    CVE-2018-9516

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

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=trC+
-----END PGP SIGNATURE-----

« Back to bulletins