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AUSCERT External Security Bulletin Redistribution
ESB-2018.1736
Linux kernel vulnerabilities
12 June 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-10940 CVE-2018-8087 CVE-2018-1093
CVE-2018-1092
Reference: ESB-2018.1663
ESB-2018.1623
ESB-2018.1229
ESB-2018.0844
Original Bulletin:
http://www.ubuntu.com/usn/usn-3676-1
http://www.ubuntu.com/usn/usn-3676-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
==========================================================================
Ubuntu Security Notice USN-3676-1
June 11, 2018
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon 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: Linux kernel
- - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- - linux-kvm: Linux kernel for cloud environments
- - linux-raspi2: Linux kernel for Raspberry Pi 2
- - linux-snapdragon: Linux kernel for Snapdragon processors
Details:
Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly handle corrupted meta data in some situations. An
attacker could use this to specially craft an ext4 file system that caused
a denial of service (system crash) when mounted. (CVE-2018-1092,
CVE-2018-1093)
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)
It was discovered that the 802.11 software simulator implementation in the
Linux kernel contained a memory leak when handling certain error
conditions. A local attacker could possibly use this to cause a denial of
service (memory exhaustion). (CVE-2018-8087)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.4.0-1027-kvm 4.4.0-1027.32
linux-image-4.4.0-1061-aws 4.4.0-1061.70
linux-image-4.4.0-1091-raspi2 4.4.0-1091.99
linux-image-4.4.0-1094-snapdragon 4.4.0-1094.99
linux-image-4.4.0-128-generic 4.4.0-128.154
linux-image-4.4.0-128-generic-lpae 4.4.0-128.154
linux-image-4.4.0-128-lowlatency 4.4.0-128.154
linux-image-4.4.0-128-powerpc-e500mc 4.4.0-128.154
linux-image-4.4.0-128-powerpc-smp 4.4.0-128.154
linux-image-4.4.0-128-powerpc64-emb 4.4.0-128.154
linux-image-4.4.0-128-powerpc64-smp 4.4.0-128.154
linux-image-aws 4.4.0.1061.63
linux-image-generic 4.4.0.128.134
linux-image-generic-lpae 4.4.0.128.134
linux-image-kvm 4.4.0.1027.26
linux-image-lowlatency 4.4.0.128.134
linux-image-powerpc-e500mc 4.4.0.128.134
linux-image-powerpc-smp 4.4.0.128.134
linux-image-powerpc64-emb 4.4.0.128.134
linux-image-powerpc64-smp 4.4.0.128.134
linux-image-raspi2 4.4.0.1091.91
linux-image-snapdragon 4.4.0.1094.86
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-3676-1
CVE-2018-1092, CVE-2018-1093, CVE-2018-10940, CVE-2018-8087
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-128.154
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1061.70
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1027.32
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1091.99
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1094.99
- -------------------------------------------------------------------------------
==========================================================================
Ubuntu Security Notice USN-3676-2
June 11, 2018
linux-lts-xenial, linux-aws vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
Details:
USN-3676-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.
Wen Xu discovered that the ext4 filesystem implementation in the Linux
kernel did not properly handle corrupted meta data in some situations. An
attacker could use this to specially craft an ext4 file system that caused
a denial of service (system crash) when mounted. (CVE-2018-1092,
CVE-2018-1093)
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)
It was discovered that the 802.11 software simulator implementation in the
Linux kernel contained a memory leak when handling certain error
conditions. A local attacker could possibly use this to cause a denial of
service (memory exhaustion). (CVE-2018-8087)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 LTS:
linux-image-4.4.0-1023-aws 4.4.0-1023.23
linux-image-4.4.0-128-generic 4.4.0-128.154~14.04.1
linux-image-4.4.0-128-generic-lpae 4.4.0-128.154~14.04.1
linux-image-4.4.0-128-lowlatency 4.4.0-128.154~14.04.1
linux-image-4.4.0-128-powerpc-e500mc 4.4.0-128.154~14.04.1
linux-image-4.4.0-128-powerpc-smp 4.4.0-128.154~14.04.1
linux-image-4.4.0-128-powerpc64-emb 4.4.0-128.154~14.04.1
linux-image-4.4.0-128-powerpc64-smp 4.4.0-128.154~14.04.1
linux-image-aws 4.4.0.1023.23
linux-image-generic-lpae-lts-xenial 4.4.0.128.108
linux-image-generic-lts-xenial 4.4.0.128.108
linux-image-lowlatency-lts-xenial 4.4.0.128.108
linux-image-powerpc-e500mc-lts-xenial 4.4.0.128.108
linux-image-powerpc-smp-lts-xenial 4.4.0.128.108
linux-image-powerpc64-emb-lts-xenial 4.4.0.128.108
linux-image-powerpc64-smp-lts-xenial 4.4.0.128.108
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-3676-2
https://usn.ubuntu.com/usn/usn-3676-1
CVE-2018-1092, CVE-2018-1093, CVE-2018-10940, CVE-2018-8087
Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1023.23
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-128.154~14.04.1
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===========================================================================
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The University of Queensland
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===========================================================================
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