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AUSCERT External Security Bulletin Redistribution
ESB-2019.0856
Linux kernel vulnerabilities
18 March 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6133 CVE-2018-19985 CVE-2018-7740
CVE-2018-1120 CVE-2017-18241
Reference: ESB-2019.0791.2
ESB-2019.0716
ESB-2019.0691
ESB-2018.3377
Original Bulletin:
http://www.ubuntu.com/usn/usn-3910-1
http://www.ubuntu.com/usn/usn-3910-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
==========================================================================
Ubuntu Security Notice USN-3910-1
March 15, 2019
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:
It was discovered that the f2fs filesystem implementation in the Linux
kernel did not handle the noflush_merge mount option correctly. An attacker
could use this to cause a denial of service (system crash).
(CVE-2017-18241)
It was discovered that the procfs filesystem did not properly handle
processes mapping some memory elements onto files. A local attacker could
use this to block utilities that examine the procfs filesystem to report
operating system state, such as ps(1). (CVE-2018-1120)
Hui Peng and Mathias Payer discovered that the Option USB High Speed driver
in the Linux kernel did not properly validate metadata received from the
device. A physically proximate attacker could use this to cause a denial of
service (system crash). (CVE-2018-19985)
It was discovered that multiple integer overflows existed in the hugetlbfs
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash). (CVE-2018-7740)
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 16.04 LTS:
linux-image-4.4.0-1041-kvm 4.4.0-1041.47
linux-image-4.4.0-1077-aws 4.4.0-1077.87
linux-image-4.4.0-1104-raspi2 4.4.0-1104.112
linux-image-4.4.0-1108-snapdragon 4.4.0-1108.113
linux-image-4.4.0-143-generic 4.4.0-143.169
linux-image-4.4.0-143-generic-lpae 4.4.0-143.169
linux-image-4.4.0-143-lowlatency 4.4.0-143.169
linux-image-4.4.0-143-powerpc-e500mc 4.4.0-143.169
linux-image-4.4.0-143-powerpc-smp 4.4.0-143.169
linux-image-4.4.0-143-powerpc64-emb 4.4.0-143.169
linux-image-4.4.0-143-powerpc64-smp 4.4.0-143.169
linux-image-aws 4.4.0.1077.80
linux-image-generic 4.4.0.143.151
linux-image-generic-lpae 4.4.0.143.151
linux-image-kvm 4.4.0.1041.41
linux-image-lowlatency 4.4.0.143.151
linux-image-powerpc-e500mc 4.4.0.143.151
linux-image-powerpc-smp 4.4.0.143.151
linux-image-powerpc64-emb 4.4.0.143.151
linux-image-powerpc64-smp 4.4.0.143.151
linux-image-raspi2 4.4.0.1104.104
linux-image-snapdragon 4.4.0.1108.100
linux-image-virtual 4.4.0.143.151
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-3910-1
CVE-2017-18241, CVE-2018-1120, CVE-2018-19985, CVE-2018-7740,
CVE-2019-6133
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-143.169
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1077.87
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1041.47
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1104.112
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1108.113
==========================================================================
Ubuntu Security Notice USN-3910-2
March 15, 2019
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-3910-1 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.
It was discovered that the f2fs filesystem implementation in the Linux
kernel did not handle the noflush_merge mount option correctly. An attacker
could use this to cause a denial of service (system crash).
(CVE-2017-18241)
It was discovered that the procfs filesystem did not properly handle
processes mapping some memory elements onto files. A local attacker could
use this to block utilities that examine the procfs filesystem to report
operating system state, such as ps(1). (CVE-2018-1120)
Hui Peng and Mathias Payer discovered that the Option USB High Speed driver
in the Linux kernel did not properly validate metadata received from the
device. A physically proximate attacker could use this to cause a denial of
service (system crash). (CVE-2018-19985)
It was discovered that multiple integer overflows existed in the hugetlbfs
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash). (CVE-2018-7740)
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 14.04 LTS:
linux-image-4.4.0-1039-aws 4.4.0-1039.42
linux-image-4.4.0-143-generic 4.4.0-143.169~14.04.2
linux-image-4.4.0-143-generic-lpae 4.4.0-143.169~14.04.2
linux-image-4.4.0-143-lowlatency 4.4.0-143.169~14.04.2
linux-image-4.4.0-143-powerpc-e500mc 4.4.0-143.169~14.04.2
linux-image-4.4.0-143-powerpc-smp 4.4.0-143.169~14.04.2
linux-image-4.4.0-143-powerpc64-emb 4.4.0-143.169~14.04.2
linux-image-4.4.0-143-powerpc64-smp 4.4.0-143.169~14.04.2
linux-image-aws 4.4.0.1039.40
linux-image-generic-lpae-lts-xenial 4.4.0.143.125
linux-image-generic-lts-xenial 4.4.0.143.125
linux-image-lowlatency-lts-xenial 4.4.0.143.125
linux-image-powerpc-e500mc-lts-xenial 4.4.0.143.125
linux-image-powerpc-smp-lts-xenial 4.4.0.143.125
linux-image-powerpc64-emb-lts-xenial 4.4.0.143.125
linux-image-powerpc64-smp-lts-xenial 4.4.0.143.125
linux-image-virtual-lts-xenial 4.4.0.143.125
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-3910-2
https://usn.ubuntu.com/usn/usn-3910-1
CVE-2017-18241, CVE-2018-1120, CVE-2018-19985, CVE-2018-7740,
CVE-2019-6133
Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1039.42
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-143.169~14.04.2
- --------------------------END INCLUDED TEXT--------------------
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