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AUSCERT External Security Bulletin Redistribution
ESB-2020.2388
USN-4412-1: 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
Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-13143 CVE-2020-12770 CVE-2020-12768
CVE-2020-10751 CVE-2020-10711
Reference: ESB-2020.2009.3
ESB-2020.1729.2
Original Bulletin:
https://usn.ubuntu.com/4412-1/
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USN-4412-1: Linux kernel vulnerabilities
06 July 2020
linux, linux-aws, linux-aws-5.3, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2-5.3 vulnerabilities
Releases
o Ubuntu 19.10
o Ubuntu 18.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-5.3 - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-5.3 - Linux kernel for Microsoft Azure Cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke-5.3 - 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-oracle - Linux kernel for Oracle Cloud systems
o linux-oracle-5.3 - Linux kernel for Oracle Cloud systems
o linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V7) systems
Details
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)
Dmitry Vyukov discovered that the SELinux netlink security hook in the
Linux kernel did not validate messages in some situations. A privileged
attacker could use this to bypass SELinux netlink restrictions.
(CVE-2020-10751)
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 19.10
o linux-image-5.3.0-1024-kvm - 5.3.0-1024.26
o linux-image-5.3.0-1028-oracle - 5.3.0-1028.30
o linux-image-5.3.0-1030-aws - 5.3.0-1030.32
o linux-image-5.3.0-1030-gcp - 5.3.0-1030.32
o linux-image-5.3.0-1032-azure - 5.3.0-1032.33
o linux-image-5.3.0-62-generic - 5.3.0-62.56
o linux-image-5.3.0-62-generic-lpae - 5.3.0-62.56
o linux-image-5.3.0-62-lowlatency - 5.3.0-62.56
o linux-image-5.3.0-62-snapdragon - 5.3.0-62.56
o linux-image-aws - 5.3.0.1030.40
o linux-image-azure - 5.3.0.1032.50
o linux-image-gcp - 5.3.0.1030.40
o linux-image-generic - 5.3.0.62.52
o linux-image-generic-lpae - 5.3.0.62.52
o linux-image-gke - 5.3.0.1030.40
o linux-image-kvm - 5.3.0.1024.22
o linux-image-lowlatency - 5.3.0.62.52
o linux-image-oracle - 5.3.0.1028.43
o linux-image-snapdragon - 5.3.0.62.52
o linux-image-virtual - 5.3.0.62.52
Ubuntu 18.04
o linux-image-5.3.0-1028-oracle - 5.3.0-1028.30~18.04.1
o linux-image-5.3.0-1028-raspi2 - 5.3.0-1028.30~18.04.2
o linux-image-5.3.0-1030-aws - 5.3.0-1030.32~18.04.1
o linux-image-5.3.0-1030-gcp - 5.3.0-1030.32~18.04.1
o linux-image-5.3.0-1030-gke - 5.3.0-1030.32~18.04.1
o linux-image-5.3.0-1032-azure - 5.3.0-1032.33~18.04.1
o linux-image-5.3.0-62-generic - 5.3.0-62.56~18.04.1
o linux-image-5.3.0-62-generic-lpae - 5.3.0-62.56~18.04.1
o linux-image-5.3.0-62-lowlatency - 5.3.0-62.56~18.04.1
o linux-image-aws - 5.3.0.1030.28
o linux-image-azure - 5.3.0.1032.28
o linux-image-gcp - 5.3.0.1030.24
o linux-image-generic-hwe-18.04 - 5.3.0.62.115
o linux-image-generic-lpae-hwe-18.04 - 5.3.0.62.115
o linux-image-gke-5.3 - 5.3.0.1030.15
o linux-image-gkeop-5.3 - 5.3.0.62.115
o linux-image-lowlatency-hwe-18.04 - 5.3.0.62.115
o linux-image-oracle - 5.3.0.1028.25
o linux-image-raspi2-hwe-18.04 - 5.3.0.1028.17
o linux-image-snapdragon-hwe-18.04 - 5.3.0.62.115
o linux-image-virtual-hwe-18.04 - 5.3.0.62.115
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-2020-10711
o CVE-2020-10751
o CVE-2020-12768
o CVE-2020-12770
o CVE-2020-13143
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