ESB-2018.1915 - [Ubuntu] kernel: Multiple vulnerabilities 2018-07-03

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

                               ESB-2018.1915
                       Linux kernel vulnerabilities
                                3 July 2018

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

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

Product:           linux
                   linux-aws
                   linux-azure
                   linux-gcp
                   linux-kvm
                   linux-oem
                   linux-raspi2
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Console/Physical
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-11508 CVE-2018-10940 CVE-2018-7755
                   CVE-2018-1095 CVE-2018-1094 

Reference:         ESB-2018.1736
                   ESB-2018.1663

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3695-1
   http://www.ubuntu.com/usn/usn-3695-2

Comment: This bulletin contains two (2) Ubuntu security advisories.
         
         This advisory references vulnerabilities in the Linux kernel that 
         also affect distributions other than Ubuntu. It is recommended that
         administrators running Linux check for an updated version of the 
         kernel for their system.
         
         CVE-2018-1094, CVE-2018-1095, CVE-2018-11508 and CVE-2018-7755 are
         all new, but CVE-2018-10940 is present in the referenced bulletins.

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

==========================================================================
Ubuntu Security Notice USN-3695-1
July 02, 2018

linux, linux-aws, linux-azure, 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: Linux kernel
- - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- - linux-azure: Linux kernel for Microsoft Azure Cloud 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 the ext4 file system implementation in the Linux
kernel did not properly initialize the crc32c checksum driver. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2018-1094)

It was discovered that the cdrom driver in the Linux kernel contained an
incorrect bounds check. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2018-10940)

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel did not properly validate xattr sizes. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-1095)

Jann Horn discovered that the 32 bit adjtimex() syscall implementation for
64 bit Linux kernels did not properly initialize memory returned to user
space in some situations. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-11508)

It was discovered that an information leak vulnerability existed in the
floppy driver in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2018-7755)

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-gcp     4.15.0-1010.10
  linux-image-4.15.0-1011-aws     4.15.0-1011.11
  linux-image-4.15.0-1012-kvm     4.15.0-1012.12
  linux-image-4.15.0-1013-raspi2  4.15.0-1013.14
  linux-image-4.15.0-1014-azure   4.15.0-1014.14
  linux-image-4.15.0-24-generic   4.15.0-24.26
  linux-image-4.15.0-24-generic-lpae  4.15.0-24.26
  linux-image-4.15.0-24-lowlatency  4.15.0-24.26
  linux-image-4.15.0-24-snapdragon  4.15.0-24.26
  linux-image-aws                 4.15.0.1011.11
  linux-image-azure               4.15.0.1014.14
  linux-image-gcp                 4.15.0.1010.12
  linux-image-generic             4.15.0.24.26
  linux-image-generic-lpae        4.15.0.24.26
  linux-image-gke                 4.15.0.1010.12
  linux-image-kvm                 4.15.0.1012.12
  linux-image-lowlatency          4.15.0.24.26
  linux-image-oem                 4.15.0.1009.11
  linux-image-raspi2              4.15.0.1013.11
  linux-image-snapdragon          4.15.0.24.26

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-3695-1
  CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508,
  CVE-2018-7755

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-24.26
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1011.11
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1010.10
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1012.12
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1009.12
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1013.14

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

==========================================================================
Ubuntu Security Notice USN-3695-2
July 02, 2018

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

Details:

USN-3695-1 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 the ext4 file system implementation in the Linux
kernel did not properly initialize the crc32c checksum driver. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2018-1094)

It was discovered that the cdrom driver in the Linux kernel contained an
incorrect bounds check. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2018-10940)

Wen Xu discovered that the ext4 file system implementation in the Linux
kernel did not properly validate xattr sizes. A local attacker could use
this to cause a denial of service (system crash). (CVE-2018-1095)

Jann Horn discovered that the 32 bit adjtimex() syscall implementation for
64 bit Linux kernels did not properly initialize memory returned to user
space in some situations. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-11508)

It was discovered that an information leak vulnerability existed in the
floppy driver in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2018-7755)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1014-azure   4.15.0-1014.14~16.04.1
  linux-image-4.15.0-24-generic   4.15.0-24.26~16.04.1
  linux-image-4.15.0-24-generic-lpae  4.15.0-24.26~16.04.1
  linux-image-4.15.0-24-lowlatency  4.15.0-24.26~16.04.1
  linux-image-azure               4.15.0.1014.21
  linux-image-generic-hwe-16.04   4.15.0.24.46
  linux-image-generic-lpae-hwe-16.04  4.15.0.24.46
  linux-image-lowlatency-hwe-16.04  4.15.0.24.46

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-3695-2
  https://usn.ubuntu.com/usn/usn-3695-1
  CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508,
  CVE-2018-7755

Package Information:
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-24.26~16.04.1

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

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