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AUSCERT External Security Bulletin Redistribution
ESB-2019.0320.2
Linux kernel vulnerabilities
8 February 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-19854 CVE-2018-19407 CVE-2018-16882
CVE-2018-14625
Reference: ESB-2019.0314
ESB-2019.0254
Original Bulletin:
http://www.ubuntu.com/usn/usn-3878-1
http://www.ubuntu.com/usn/usn-3878-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
Revision History: February 8 2019: Added USN-3878-2 for Azure kernels
February 5 2019: Initial Release
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Ubuntu Security Notice USN-3878-1
February 04, 2019
linux, linux-aws, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.10
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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- - linux-kvm: Linux kernel for cloud environments
- - linux-raspi2: Linux kernel for Raspberry Pi 2
Details:
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)
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 crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local attacker
could use this to expose sensitive information (kernel memory).
(CVE-2018-19854)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.10:
linux-image-4.18.0-1006-gcp 4.18.0-1006.7
linux-image-4.18.0-1007-kvm 4.18.0-1007.7
linux-image-4.18.0-1008-aws 4.18.0-1008.10
linux-image-4.18.0-1009-raspi2 4.18.0-1009.11
linux-image-4.18.0-14-generic 4.18.0-14.15
linux-image-4.18.0-14-generic-lpae 4.18.0-14.15
linux-image-4.18.0-14-lowlatency 4.18.0-14.15
linux-image-4.18.0-14-snapdragon 4.18.0-14.15
linux-image-aws 4.18.0.1008.8
linux-image-gcp 4.18.0.1006.6
linux-image-generic 4.18.0.14.15
linux-image-generic-lpae 4.18.0.14.15
linux-image-gke 4.18.0.1006.6
linux-image-kvm 4.18.0.1007.7
linux-image-lowlatency 4.18.0.14.15
linux-image-raspi2 4.18.0.1009.6
linux-image-snapdragon 4.18.0.14.15
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-3878-1
CVE-2018-14625, CVE-2018-16882, CVE-2018-19407, CVE-2018-19854
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.18.0-14.15
https://launchpad.net/ubuntu/+source/linux-aws/4.18.0-1008.10
https://launchpad.net/ubuntu/+source/linux-gcp/4.18.0-1006.7
https://launchpad.net/ubuntu/+source/linux-kvm/4.18.0-1007.7
https://launchpad.net/ubuntu/+source/linux-raspi2/4.18.0-1009.11
- -------------------------------------------------------------------------------
USN-3878-2: Linux kernel (Azure) vulnerabilities
7 February 2019
linux-azure vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 18.10
Summary
Several security issues were fixed in the Linux kernel.
Software Description
linux-azure - Linux kernel for Microsoft Azure Cloud systems
Details
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)
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 crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2018-19854)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.10
linux-image-4.18.0-1008-azure - 4.18.0-1008.8
linux-image-azure - 4.18.0.1008.9
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-3878-1
CVE-2018-14625
CVE-2018-16882
CVE-2018-19407
CVE-2018-19854
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