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AUSCERT External Security Bulletin Redistribution
ESB-2020.0949
USN-4302-1: Linux kernel vulnerabilities
18 March 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8832 CVE-2020-2732 CVE-2019-19068
CVE-2019-19066 CVE-2019-19058 CVE-2019-19056
CVE-2019-19051 CVE-2019-19046 CVE-2019-15217
CVE-2019-14615
Reference: ESB-2020.0925
ESB-2020.0830
ESB-2020.0766
ESB-2019.3817
ESB-2019.3744
Original Bulletin:
https://usn.ubuntu.com/4302-1/
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USN-4302-1: Linux kernel vulnerabilities
17 March 2020
linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm,
linux-raspi2, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
o linux-kvm - Linux kernel for cloud environments
o linux-raspi2 - Linux kernel for Raspberry Pi 2
o linux-snapdragon - Linux kernel for Snapdragon processors
o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
Details
Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux
kernel could improperly let a nested (level 2) guest access the resources of a
parent (level 1) guest in certain situations. An attacker could use this to
expose sensitive information. (CVE-2020-2732)
Gregory Herrero discovered that the fix for CVE-2019-14615 to address the Linux
kernel not properly clearing data structures on context switches for certain
Intel graphics processors was incomplete. A local attacker could use this to
expose sensitive information. (CVE-2020-8832)
It was discovered that the IPMI message handler implementation in the Linux
kernel did not properly deallocate memory in certain situations. A local
attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19046)
It was discovered that the Intel WiMAX 2400 driver in the Linux kernel did not
properly deallocate memory in certain situations. A local attacker could use
this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19051)
It was discovered that the Marvell Wi-Fi device driver in the Linux kernel did
not properly deallocate memory in certain error conditions. A local attacker
could use this to possibly cause a denial of service (kernel memory
exhaustion). (CVE-2019-19056)
It was discovered that the Intel Wi-Fi device driver in the Linux kernel device
driver in the Linux kernel did not properly deallocate memory in certain error
conditions. A local attacker could possibly use this to cause a denial of
service (kernel memory exhaustion). (CVE-2019-19058)
It was discovered that the Brocade BFA Fibre Channel device driver in the Linux
kernel did not properly deallocate memory in certain error conditions. A local
attacker could possibly use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19066)
It was discovered that the Realtek RTL8xxx USB Wi-Fi device driver in the Linux
kernel did not properly deallocate memory in certain error conditions. A local
attacker could possibly use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19068)
It was discovered that ZR364XX Camera USB device driver for the Linux kernel
did not properly initialize memory. A physically proximate attacker could use
this to cause a denial of service (system crash). (CVE-2019-15217)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1055-gke - 4.15.0-1055.58
linux-image-4.15.0-1056-kvm - 4.15.0-1056.57
linux-image-4.15.0-1057-raspi2 - 4.15.0-1057.61
linux-image-4.15.0-1063-aws - 4.15.0-1063.67
linux-image-4.15.0-1074-snapdragon - 4.15.0-1074.81
linux-image-4.15.0-91-generic - 4.15.0-91.92
linux-image-4.15.0-91-generic-lpae - 4.15.0-91.92
linux-image-4.15.0-91-lowlatency - 4.15.0-91.92
linux-image-aws - 4.15.0.1063.64
linux-image-aws-lts-18.04 - 4.15.0.1063.64
linux-image-generic - 4.15.0.91.83
linux-image-generic-lpae - 4.15.0.91.83
linux-image-gke - 4.15.0.1055.59
linux-image-gke-4.15 - 4.15.0.1055.59
linux-image-kvm - 4.15.0.1056.56
linux-image-lowlatency - 4.15.0.91.83
linux-image-powerpc-e500mc - 4.15.0.91.83
linux-image-powerpc-smp - 4.15.0.91.83
linux-image-powerpc64-emb - 4.15.0.91.83
linux-image-powerpc64-smp - 4.15.0.91.83
linux-image-raspi2 - 4.15.0.1057.55
linux-image-snapdragon - 4.15.0.1074.77
linux-image-virtual - 4.15.0.91.83
Ubuntu 16.04 LTS
linux-image-4.15.0-1058-gcp - 4.15.0-1058.62
linux-image-4.15.0-1063-aws - 4.15.0-1063.67~16.04.1
linux-image-4.15.0-91-generic - 4.15.0-91.92~16.04.1
linux-image-4.15.0-91-generic-lpae - 4.15.0-91.92~16.04.1
linux-image-4.15.0-91-lowlatency - 4.15.0-91.92~16.04.1
linux-image-aws-hwe - 4.15.0.1063.63
linux-image-gcp - 4.15.0.1058.72
linux-image-generic-hwe-16.04 - 4.15.0.91.101
linux-image-generic-lpae-hwe-16.04 - 4.15.0.91.101
linux-image-gke - 4.15.0.1058.72
linux-image-lowlatency-hwe-16.04 - 4.15.0.91.101
linux-image-oem - 4.15.0.91.101
linux-image-virtual-hwe-16.04 - 4.15.0.91.101
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
o CVE-2019-15217
o CVE-2019-19046
o CVE-2019-19051
o CVE-2019-19056
o CVE-2019-19058
o CVE-2019-19066
o CVE-2019-19068
o CVE-2020-2732
o CVE-2020-8832
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