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AUSCERT External Security Bulletin Redistribution
ESB-2020.2507
USN-4425-1: Linux kernel vulnerabilities
22 July 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15780 CVE-2020-13974 CVE-2020-11935
CVE-2020-10768 CVE-2020-10767 CVE-2020-10766
CVE-2020-10757 CVE-2020-10732 CVE-2019-20908
CVE-2019-20810 CVE-2019-19947 CVE-2019-19462
CVE-2019-16089 CVE-2019-12380
Reference: ESB-2020.2504
ESB-2020.2389
ESB-2020.2384
ESB-2020.2008.2
ESB-2019.3590
Original Bulletin:
https://usn.ubuntu.com/4425-1/
https://usn.ubuntu.com/4426-1/
https://usn.ubuntu.com/4427-1/
Comment: This bulletin contains three (3) Ubuntu security advisories.
This advisory references vulnerabilities in the Linux kernel that
also affect distributions other than Ubuntu. It is recommended that
administrators running Linux check for an updated version of the
kernel for their system.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4425-1: Linux kernel vulnerabilities
21 July 2020
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems
o linux-riscv - Linux kernel for RISC-V systems
Details
It was discovered that the network block device (nbd) implementation in the
Linux kernel did not properly check for error conditions in some
situations. An attacker could possibly use this to cause a denial of
service (system crash). (CVE-2019-16089)
It was discovered that the kernel->user space relay implementation in the
Linux kernel did not properly check return values in some situations. A
local attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-19462)
Mauricio Faria de Oliveira discovered that the aufs implementation in the
Linux kernel improperly managed inode reference counts in the
vfsub_dentry_open() method. A local attacker could use this vulnerability
to cause a denial of service. (CVE-2020-11935)
Jason A. Donenfeld discovered that the ACPI implementation in the Linux
kernel did not properly restrict loading ACPI tables via configfs. A
privileged attacker could use this to bypass Secure Boot lockdown
restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.4.0-1020-aws - 5.4.0-1020.20
o linux-image-5.4.0-1021-gcp - 5.4.0-1021.21
o linux-image-5.4.0-1021-oracle - 5.4.0-1021.21
o linux-image-5.4.0-30-generic - 5.4.0-30.34
o linux-image-5.4.0-42-generic - 5.4.0-42.46
o linux-image-5.4.0-42-generic-lpae - 5.4.0-42.46
o linux-image-5.4.0-42-lowlatency - 5.4.0-42.46
o linux-image-aws - 5.4.0.1020.21
o linux-image-gcp - 5.4.0.1021.19
o linux-image-generic - 5.4.0.30.37
o linux-image-generic-lpae - 5.4.0.42.45
o linux-image-gke - 5.4.0.1021.19
o linux-image-kvm - 5.4.0.1020.19
o linux-image-lowlatency - 5.4.0.42.45
o linux-image-oem - 5.4.0.42.45
o linux-image-oem-osp1 - 5.4.0.42.45
o linux-image-oracle - 5.4.0.1021.19
o linux-image-virtual - 5.4.0.30.37
Ubuntu 18.04
o linux-image-5.4.0-1015-raspi - 5.4.0-1015.15~18.04.1
o linux-image-5.4.0-42-generic - 5.4.0-42.46~18.04.1
o linux-image-5.4.0-42-generic-lpae - 5.4.0-42.46~18.04.1
o linux-image-5.4.0-42-lowlatency - 5.4.0-42.46~18.04.1
o linux-image-generic-hwe-18.04 - 5.4.0.42.46~18.04.35
o linux-image-generic-lpae-hwe-18.04 - 5.4.0.42.46~18.04.35
o linux-image-gkeop-5.4 - 5.4.0.42.46~18.04.35
o linux-image-lowlatency-hwe-18.04 - 5.4.0.42.46~18.04.35
o linux-image-raspi-hwe-18.04 - 5.4.0.1015.19
o linux-image-snapdragon-hwe-18.04 - 5.4.0.42.46~18.04.35
o linux-image-virtual-hwe-18.04 - 5.4.0.42.46~18.04.35
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-2020-15780
o CVE-2020-11935
o CVE-2019-16089
o CVE-2019-19462
- --------------------------------------------------------------------------------
USN-4426-1: Linux kernel vulnerabilities
21 July 2020
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
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-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
o linux-kvm - Linux kernel for cloud environments
o linux-oem - Linux kernel for OEM systems
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi2 - Linux kernel for Raspberry Pi (V7) systems
Details
Jason A. Donenfeld discovered that the ACPI implementation in the Linux
kernel did not properly restrict loading SSDT code from an EFI variable. A
privileged attacker could use this to bypass Secure Boot lockdown
restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)
Fan Yang discovered that the mremap implementation in the Linux kernel did
not properly handle DAX Huge Pages. A local attacker with access to DAX
storage could use this to gain administrative privileges. (CVE-2020-10757)
Mauricio Faria de Oliveira discovered that the aufs implementation in the
Linux kernel improperly managed inode reference counts in the
vfsub_dentry_open() method. A local attacker could use this vulnerability
to cause a denial of service. (CVE-2020-11935)
Jason A. Donenfeld discovered that the ACPI implementation in the Linux
kernel did not properly restrict loading ACPI tables via configfs. A
privileged attacker could use this to bypass Secure Boot lockdown
restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-4.15.0-1050-oracle - 4.15.0-1050.54
o linux-image-4.15.0-1066-gke - 4.15.0-1066.69
o linux-image-4.15.0-1067-raspi2 - 4.15.0-1067.71
o linux-image-4.15.0-1071-kvm - 4.15.0-1071.72
o linux-image-4.15.0-1079-aws - 4.15.0-1079.83
o linux-image-4.15.0-1080-gcp - 4.15.0-1080.90
o linux-image-4.15.0-1093-oem - 4.15.0-1093.103
o linux-image-4.15.0-112-generic - 4.15.0-112.113
o linux-image-4.15.0-112-generic-lpae - 4.15.0-112.113
o linux-image-4.15.0-112-lowlatency - 4.15.0-112.113
o linux-image-aws-lts-18.04 - 4.15.0.1079.81
o linux-image-gcp-lts-18.04 - 4.15.0.1080.96
o linux-image-generic - 4.15.0.112.100
o linux-image-generic-lpae - 4.15.0.112.100
o linux-image-gke - 4.15.0.1066.68
o linux-image-gke-4.15 - 4.15.0.1066.68
o linux-image-kvm - 4.15.0.1071.67
o linux-image-lowlatency - 4.15.0.112.100
o linux-image-oem - 4.15.0.1093.96
o linux-image-oracle-lts-18.04 - 4.15.0.1050.59
o linux-image-powerpc-e500mc - 4.15.0.112.100
o linux-image-powerpc-smp - 4.15.0.112.100
o linux-image-powerpc64-emb - 4.15.0.112.100
o linux-image-powerpc64-smp - 4.15.0.112.100
o linux-image-raspi2 - 4.15.0.1067.65
o linux-image-virtual - 4.15.0.112.100
Ubuntu 16.04
o linux-image-4.15.0-1050-oracle - 4.15.0-1050.54~16.04.1
o linux-image-4.15.0-1079-aws - 4.15.0-1079.83~16.04.1
o linux-image-4.15.0-1080-gcp - 4.15.0-1080.90~16.04.1
o linux-image-aws-hwe - 4.15.0.1079.76
o linux-image-gcp - 4.15.0.1080.82
o linux-image-gke - 4.15.0.1080.82
o linux-image-oracle - 4.15.0.1050.41
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-2019-20908
o CVE-2020-10757
o CVE-2020-11935
o CVE-2020-15780
- --------------------------------------------------------------------------------
USN-4427-1: Linux kernel vulnerabilities
22 July 2020
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-kvm - Linux kernel for cloud environments
o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
o linux-raspi2 - Linux kernel for Raspberry Pi (V7) systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
It was discovered that the Kvaser CAN/USB driver in the Linux kernel did
not properly initialize memory in certain situations. A local attacker
could possibly use this to expose sensitive information (kernel memory).
(CVE-2019-19947)
Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
kernel did not properly deallocate memory in some failure conditions. A
physically proximate attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2019-20810)
Jason A. Donenfeld discovered that the ACPI implementation in the Linux
kernel did not properly restrict loading SSDT code from an EFI variable. A
privileged attacker could use this to bypass Secure Boot lockdown
restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)
It was discovered that the elf handling code in the Linux kernel did not
initialize memory before using it in certain situations. A local attacker
could use this to possibly expose sensitive information (kernel memory).
(CVE-2020-10732)
It was discovered that the Linux kernel did not correctly apply Speculative
Store Bypass Disable (SSBD) mitigations in certain situations. A local
attacker could possibly use this to expose sensitive information.
(CVE-2020-10766)
It was discovered that the Linux kernel did not correctly apply Indirect
Branch Predictor Barrier (IBPB) mitigations in certain situations. A local
attacker could possibly use this to expose sensitive information.
(CVE-2020-10767)
It was discovered that the Linux kernel could incorrectly enable indirect
branch speculation after it has been disabled for a process via a prctl()
call. A local attacker could possibly use this to expose sensitive
information. (CVE-2020-10768)
Mauricio Faria de Oliveira discovered that the aufs implementation in the
Linux kernel improperly managed inode reference counts in the
vfsub_dentry_open() method. A local attacker could use this vulnerability
to cause a denial of service. (CVE-2020-11935)
It was discovered that the Virtual Terminal keyboard driver in the Linux
kernel contained an integer overflow. A local attacker could possibly use
this to have a unspecified impact. (CVE-2020-13974)
It was discovered that the efi subsystem in the Linux kernel did not handle
memory allocation failures during early boot in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-12380)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o linux-image-4.4.0-1077-kvm - 4.4.0-1077.84
o linux-image-4.4.0-1111-aws - 4.4.0-1111.123
o linux-image-4.4.0-1136-raspi2 - 4.4.0-1136.145
o linux-image-4.4.0-1140-snapdragon - 4.4.0-1140.148
o linux-image-4.4.0-186-generic - 4.4.0-186.216
o linux-image-4.4.0-186-generic-lpae - 4.4.0-186.216
o linux-image-4.4.0-186-lowlatency - 4.4.0-186.216
o linux-image-4.4.0-186-powerpc-e500mc - 4.4.0-186.216
o linux-image-4.4.0-186-powerpc-smp - 4.4.0-186.216
o linux-image-4.4.0-186-powerpc64-emb - 4.4.0-186.216
o linux-image-4.4.0-186-powerpc64-smp - 4.4.0-186.216
o linux-image-aws - 4.4.0.1111.116
o linux-image-generic - 4.4.0.186.192
o linux-image-generic-lpae - 4.4.0.186.192
o linux-image-kvm - 4.4.0.1077.75
o linux-image-lowlatency - 4.4.0.186.192
o linux-image-powerpc-e500mc - 4.4.0.186.192
o linux-image-powerpc-smp - 4.4.0.186.192
o linux-image-powerpc64-emb - 4.4.0.186.192
o linux-image-powerpc64-smp - 4.4.0.186.192
o linux-image-raspi2 - 4.4.0.1136.136
o linux-image-snapdragon - 4.4.0.1140.132
o linux-image-virtual - 4.4.0.186.192
Ubuntu 14.04
o linux-image-4.4.0-1075-aws - 4.4.0-1075.79
o linux-image-4.4.0-186-generic - 4.4.0-186.216~14.04.1
o linux-image-4.4.0-186-generic-lpae - 4.4.0-186.216~14.04.1
o linux-image-4.4.0-186-lowlatency - 4.4.0-186.216~14.04.1
o linux-image-4.4.0-186-powerpc-e500mc - 4.4.0-186.216~14.04.1
o linux-image-4.4.0-186-powerpc-smp - 4.4.0-186.216~14.04.1
o linux-image-4.4.0-186-powerpc64-emb - 4.4.0-186.216~14.04.1
o linux-image-4.4.0-186-powerpc64-smp - 4.4.0-186.216~14.04.1
o linux-image-aws - 4.4.0.1075.72
o linux-image-generic-lpae-lts-xenial - 4.4.0.186.163
o linux-image-generic-lts-xenial - 4.4.0.186.163
o linux-image-lowlatency-lts-xenial - 4.4.0.186.163
o linux-image-powerpc-e500mc-lts-xenial - 4.4.0.186.163
o linux-image-powerpc-smp-lts-xenial - 4.4.0.186.163
o linux-image-powerpc64-emb-lts-xenial - 4.4.0.186.163
o linux-image-powerpc64-smp-lts-xenial - 4.4.0.186.163
o linux-image-virtual-lts-xenial - 4.4.0.186.163
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-2020-10768
o CVE-2019-20810
o CVE-2020-10766
o CVE-2020-10767
o CVE-2020-13974
o CVE-2019-12380
o CVE-2019-19947
o CVE-2019-20908
o CVE-2020-10732
o CVE-2020-11935
- --------------------------END INCLUDED TEXT--------------------
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