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AUSCERT External Security Bulletin Redistribution
ESB-2020.2389
USN-4414-1: Linux kernel vulnerabilities
15 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-13143 CVE-2020-12770 CVE-2020-10711
CVE-2019-19816 CVE-2019-19813 CVE-2019-19462
CVE-2019-19377 CVE-2019-19318 CVE-2019-19039
CVE-2019-19036 CVE-2019-16089 CVE-2019-12380
Reference: ESB-2020.1851
ESB-2020.1830.2
ESB-2020.1779.3
Original Bulletin:
https://usn.ubuntu.com/4414-1/
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USN-4414-1: Linux kernel vulnerabilities
06 July 2020
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
Releases
o Ubuntu 18.04 LTS
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-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud 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-hwe - Linux hardware enablement (HWE) kernel
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
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
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 btrfs file system implementation in the Linux
kernel did not properly validate file system metadata in some situations.
An attacker could use this to construct a malicious btrfs image that, when
mounted, could cause a denial of service (system crash). (CVE-2019-19036,
CVE-2019-19318, CVE-2019-19813, CVE-2019-19816)
It was discovered that the btrfs implementation in the Linux kernel did not
properly detect that a block was marked dirty in some situations. An
attacker could use this to specially craft a file system image that, when
unmounted, could cause a denial of service (system crash). (CVE-2019-19377)
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)
Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into de-referencing a
NULL pointer. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2020-10711)
It was discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)
It was discovered that the USB Gadget device driver in the Linux kernel did
not validate arguments passed from configfs in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash) or possibly expose sensitive information. (CVE-2020-13143)
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)
It was discovered that the btrfs file system in the Linux kernel in some
error conditions could report register information to the dmesg buffer. A
local attacker could possibly use this to expose sensitive information.
(CVE-2019-19039)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-4.15.0-1048-oracle - 4.15.0-1048.52
o linux-image-4.15.0-1064-gke - 4.15.0-1064.67
o linux-image-4.15.0-1065-raspi2 - 4.15.0-1065.69
o linux-image-4.15.0-1069-kvm - 4.15.0-1069.70
o linux-image-4.15.0-1077-aws - 4.15.0-1077.81
o linux-image-4.15.0-1078-gcp - 4.15.0-1078.88
o linux-image-4.15.0-1081-snapdragon - 4.15.0-1081.88
o linux-image-4.15.0-109-generic - 4.15.0-109.110
o linux-image-4.15.0-109-generic-lpae - 4.15.0-109.110
o linux-image-4.15.0-109-lowlatency - 4.15.0-109.110
o linux-image-4.15.0-1091-azure - 4.15.0-1091.101
o linux-image-4.15.0-1091-oem - 4.15.0-1091.101
o linux-image-aws-lts-18.04 - 4.15.0.1077.79
o linux-image-azure-lts-18.04 - 4.15.0.1091.62
o linux-image-gcp-lts-18.04 - 4.15.0.1078.94
o linux-image-generic - 4.15.0.109.97
o linux-image-generic-lpae - 4.15.0.109.97
o linux-image-gke - 4.15.0.1064.66
o linux-image-gke-4.15 - 4.15.0.1064.66
o linux-image-kvm - 4.15.0.1069.65
o linux-image-lowlatency - 4.15.0.109.97
o linux-image-oem - 4.15.0.1091.94
o linux-image-oracle-lts-18.04 - 4.15.0.1048.57
o linux-image-powerpc-e500mc - 4.15.0.109.97
o linux-image-powerpc-smp - 4.15.0.109.97
o linux-image-powerpc64-emb - 4.15.0.109.97
o linux-image-powerpc64-smp - 4.15.0.109.97
o linux-image-raspi2 - 4.15.0.1065.63
o linux-image-snapdragon - 4.15.0.1081.84
o linux-image-virtual - 4.15.0.109.97
Ubuntu 16.04
o linux-image-4.15.0-1046-oracle - 4.15.0-1046.50~16.04.1
o linux-image-4.15.0-107-generic - 4.15.0-107.108~16.04.1
o linux-image-4.15.0-107-generic-lpae - 4.15.0-107.108~16.04.1
o linux-image-4.15.0-107-lowlatency - 4.15.0-107.108~16.04.1
o linux-image-4.15.0-1074-aws - 4.15.0-1074.78~16.04.1
o linux-image-4.15.0-1078-gcp - 4.15.0-1078.88~16.04.1
o linux-image-4.15.0-1091-azure - 4.15.0-1091.101~16.04.1
o linux-image-aws-hwe - 4.15.0.1074.74
o linux-image-azure - 4.15.0.1091.86
o linux-image-gcp - 4.15.0.1078.80
o linux-image-generic-hwe-16.04 - 4.15.0.107.112
o linux-image-generic-lpae-hwe-16.04 - 4.15.0.107.112
o linux-image-gke - 4.15.0.1078.80
o linux-image-lowlatency-hwe-16.04 - 4.15.0.107.112
o linux-image-oem - 4.15.0.107.112
o linux-image-oracle - 4.15.0.1046.39
o linux-image-virtual-hwe-16.04 - 4.15.0.107.112
Ubuntu 14.04
o linux-image-4.15.0-1091-azure - 4.15.0-1091.101~14.04.1
o linux-image-azure - 4.15.0.1091.68
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-2019-19318
o CVE-2019-19816
o CVE-2019-19036
o CVE-2019-19462
o CVE-2019-12380
o CVE-2019-19039
o CVE-2019-19813
o CVE-2019-16089
o CVE-2019-19377
o CVE-2020-10711
o CVE-2020-12770
o CVE-2020-13143
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