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AUSCERT External Security Bulletin Redistribution
ESB-2020.2384
USN-4411-1: 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-2020-12768
CVE-2020-10732 CVE-2020-10711
Reference: ESB-2020.2006
ESB-2020.1673
ESB-2020.1669
ESB-2020.1668
Original Bulletin:
https://usn.ubuntu.com/4411-1/
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USN-4411-1: Linux kernel vulnerabilities
06 July 2020
linux, linux-aws, inux-azure, linux-gcp, linux-kvm, linux-oracle, linux-raspi, linux-riscv vulnerabilities
Releases
o Ubuntu 20.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi - Linux kernel for Raspberry Pi (V8) systems
o linux-riscv - Linux kernel for RISC-V systems
Details
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)
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 KVM implementation in the Linux kernel did not
properly deallocate memory on initialization for some processors. A local
attacker could possibly use this to cause a denial of service.
(CVE-2020-12768)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.4.0-1013-raspi - 5.4.0-1013.13
o linux-image-5.4.0-1018-aws - 5.4.0-1018.18
o linux-image-5.4.0-1019-gcp - 5.4.0-1019.19
o linux-image-5.4.0-1019-oracle - 5.4.0-1019.19
o linux-image-5.4.0-1020-azure - 5.4.0-1020.20
o linux-image-5.4.0-28-generic - 5.4.0-28.32
o linux-image-5.4.0-40-generic - 5.4.0-40.44
o linux-image-5.4.0-40-generic-lpae - 5.4.0-40.44
o linux-image-5.4.0-40-lowlatency - 5.4.0-40.44
o linux-image-aws - 5.4.0.1018.19
o linux-image-azure - 5.4.0.1020.19
o linux-image-gcp - 5.4.0.1019.17
o linux-image-generic - 5.4.0.28.35
o linux-image-generic-lpae - 5.4.0.40.43
o linux-image-gke - 5.4.0.1019.17
o linux-image-kvm - 5.4.0.1018.17
o linux-image-lowlatency - 5.4.0.40.43
o linux-image-oem - 5.4.0.40.43
o linux-image-oem-osp1 - 5.4.0.40.43
o linux-image-oracle - 5.4.0.1019.17
o linux-image-raspi - 5.4.0.1013.13
o linux-image-raspi2 - 5.4.0.1013.13
o linux-image-virtual - 5.4.0.28.35
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-2020-13143
o CVE-2020-12768
o CVE-2020-10711
o CVE-2020-10732
o CVE-2020-12770
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