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AUSCERT External Security Bulletin Redistribution
ESB-2017.2761
Linux kernel vulnerabilities
1 November 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-1000252 CVE-2017-14340 CVE-2017-11176
CVE-2017-10911 CVE-2017-10663
Reference: ESB-2017.2729
ESB-2017.2700
ESB-2017.2650
ESB-2017.2552
ESB-2017.2401
Original Bulletin:
http://www.ubuntu.com/usn/usn-3468-1
http://www.ubuntu.com/usn/usn-3468-2
http://www.ubuntu.com/usn/usn-3468-3
Comment: This bulletin contains three (3) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
==========================================================================
Ubuntu Security Notice USN-3468-1
October 31, 2017
linux, linux-raspi2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 17.04
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux: Linux kernel
- - linux-raspi2: Linux kernel for Raspberry Pi 2
Details:
It was discovered that the KVM subsystem in the Linux kernel did not
properly bound guest IRQs. A local attacker in a guest VM could use this to
cause a denial of service (host system crash). (CVE-2017-1000252)
It was discovered that the Flash-Friendly File System (f2fs) implementation
in the Linux kernel did not properly validate superblock metadata. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-10663)
Anthony Perard discovered that the Xen virtual block driver did not
properly initialize some data structures before passing them to user space.
A local attacker in a guest VM could use this to expose sensitive
information from the host OS or other guest VMs. (CVE-2017-10911)
It was discovered that a use-after-free vulnerability existed in the POSIX
message queue 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-2017-11176)
Dave Chinner discovered that the XFS filesystem did not enforce that the
realtime inode flag was settable only on filesystems on a realtime device.
A local attacker could use this to cause a denial of service (system
crash). (CVE-2017-14340)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.04:
linux-image-4.10.0-1020-raspi2 4.10.0-1020.23
linux-image-4.10.0-38-generic 4.10.0-38.42
linux-image-4.10.0-38-generic-lpae 4.10.0-38.42
linux-image-4.10.0-38-lowlatency 4.10.0-38.42
linux-image-generic 4.10.0.38.38
linux-image-generic-lpae 4.10.0.38.38
linux-image-lowlatency 4.10.0.38.38
linux-image-raspi2 4.10.0.1020.21
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://www.ubuntu.com/usn/usn-3468-1
CVE-2017-1000252, CVE-2017-10663, CVE-2017-10911, CVE-2017-11176,
CVE-2017-14340
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.10.0-38.42
https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1020.23
==========================================================================
Ubuntu Security Notice USN-3468-2
October 31, 2017
linux-hwe 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-hwe: Linux hardware enablement (HWE) kernel
Details:
USN-3468-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS.
It was discovered that the KVM subsystem in the Linux kernel did not
properly bound guest IRQs. A local attacker in a guest VM could use this to
cause a denial of service (host system crash). (CVE-2017-1000252)
It was discovered that the Flash-Friendly File System (f2fs) implementation
in the Linux kernel did not properly validate superblock metadata. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-10663)
Anthony Perard discovered that the Xen virtual block driver did not
properly initialize some data structures before passing them to user space.
A local attacker in a guest VM could use this to expose sensitive
information from the host OS or other guest VMs. (CVE-2017-10911)
It was discovered that a use-after-free vulnerability existed in the POSIX
message queue 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-2017-11176)
Dave Chinner discovered that the XFS filesystem did not enforce that the
realtime inode flag was settable only on filesystems on a realtime device.
A local attacker could use this to cause a denial of service (system
crash). (CVE-2017-14340)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.10.0-38-generic 4.10.0-38.42~16.04.1
linux-image-4.10.0-38-generic-lpae 4.10.0-38.42~16.04.1
linux-image-4.10.0-38-lowlatency 4.10.0-38.42~16.04.1
linux-image-generic-hwe-16.04 4.10.0.38.40
linux-image-generic-lpae-hwe-16.04 4.10.0.38.40
linux-image-lowlatency-hwe-16.04 4.10.0.38.40
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://www.ubuntu.com/usn/usn-3468-2
https://www.ubuntu.com/usn/usn-3468-1
CVE-2017-1000252, CVE-2017-10663, CVE-2017-10911, CVE-2017-11176,
CVE-2017-14340
Package Information:
https://launchpad.net/ubuntu/+source/linux-hwe/4.10.0-38.42~16.04.1
==========================================================================
Ubuntu Security Notice USN-3468-3
October 31, 2017
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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
Details:
It was discovered that the KVM subsystem in the Linux kernel did not
properly bound guest IRQs. A local attacker in a guest VM could use this to
cause a denial of service (host system crash). (CVE-2017-1000252)
It was discovered that the Flash-Friendly File System (f2fs) implementation
in the Linux kernel did not properly validate superblock metadata. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-10663)
Anthony Perard discovered that the Xen virtual block driver did not
properly initialize some data structures before passing them to user space.
A local attacker in a guest VM could use this to expose sensitive
information from the host OS or other guest VMs. (CVE-2017-10911)
It was discovered that a use-after-free vulnerability existed in the POSIX
message queue 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-2017-11176)
Dave Chinner discovered that the XFS filesystem did not enforce that the
realtime inode flag was settable only on filesystems on a realtime device.
A local attacker could use this to cause a denial of service (system
crash). (CVE-2017-14340)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.10.0-1008-gcp 4.10.0-1008.8
linux-image-gcp 4.10.0.1008.10
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://www.ubuntu.com/usn/usn-3468-3
https://www.ubuntu.com/usn/usn-3468-1
CVE-2017-1000252, CVE-2017-10663, CVE-2017-10911, CVE-2017-11176,
CVE-2017-14340
Package Information:
https://launchpad.net/ubuntu/+source/linux-gcp/4.10.0-1008.8
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