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AUSCERT External Security Bulletin Redistribution
ESB-2019.3107
USN-4093-1: Linux kernel vulnerabilities
14 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-13272 CVE-2019-13233 CVE-2019-12984
CVE-2019-12614 CVE-2019-10126 CVE-2019-3846
CVE-2019-1125
Reference: ASB-2019.0229
ESB-2019.3102
ESB-2019.2171
ESB-2019.2155
ESB-2019.2132.3
Original Bulletin:
https://usn.ubuntu.com/4093-1/
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USN-4093-1: Linux kernel vulnerabilities
13 August 2019
linux, linux-hwe, linux-azure, linux-gcp, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
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-raspi2 - Linux kernel for Raspberry Pi 2
o linux-snapdragon - Linux kernel for Snapdragon processors
o linux-hwe - Linux hardware enablement (HWE) kernel
Details
It was discovered that a heap buffer overflow existed in the Marvell Wireless
LAN device driver for the Linux kernel. An attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-10126)
Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors incorrectly
handle SWAPGS instructions during speculative execution. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2019-1125)
It was discovered that the PowerPC dlpar implementation in the Linux kernel did
not properly check for allocation errors in some situations. A local attacker
could possibly use this to cause a denial of service (system crash).
(CVE-2019-12614)
It was discovered that a NULL pointer dereference vulnerability existed in the
Near-field communication (NFC) implementation in the Linux kernel. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2019-12984)
Jann Horn discovered a use-after-free vulnerability in the Linux kernel when
accessing LDT entries in some situations. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-13233)
Jann Horn discovered that the ptrace implementation in the Linux kernel did not
properly record credentials in some situations. A local attacker could use this
to cause a denial of service (system crash) or possibly gain administrative
privileges. (CVE-2019-13272)
It was discovered that the Marvell Wireless LAN device driver in the Linux
kernel did not properly validate the BSS descriptor. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-3846)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.04
linux-image-5.0.0-1013-gcp - 5.0.0-1013.13
linux-image-5.0.0-1013-kvm - 5.0.0-1013.14
linux-image-5.0.0-1014-azure - 5.0.0-1014.14
linux-image-5.0.0-1014-raspi2 - 5.0.0-1014.14
linux-image-5.0.0-1018-snapdragon - 5.0.0-1018.19
linux-image-5.0.0-25-generic - 5.0.0-25.26
linux-image-5.0.0-25-generic-lpae - 5.0.0-25.26
linux-image-5.0.0-25-lowlatency - 5.0.0-25.26
linux-image-azure - 5.0.0.1014.13
linux-image-gcp - 5.0.0.1013.13
linux-image-generic - 5.0.0.25.26
linux-image-generic-lpae - 5.0.0.25.26
linux-image-gke - 5.0.0.1013.13
linux-image-kvm - 5.0.0.1013.13
linux-image-lowlatency - 5.0.0.25.26
linux-image-raspi2 - 5.0.0.1014.11
linux-image-snapdragon - 5.0.0.1018.11
linux-image-virtual - 5.0.0.25.26
Ubuntu 18.04 LTS
linux-image-5.0.0-1014-azure - 5.0.0-1014.14~18.04.1
linux-image-5.0.0-25-generic - 5.0.0-25.26~18.04.1
linux-image-5.0.0-25-generic-lpae - 5.0.0-25.26~18.04.1
linux-image-5.0.0-25-lowlatency - 5.0.0-25.26~18.04.1
linux-image-azure - 5.0.0.1014.25
linux-image-generic-hwe-18.04 - 5.0.0.25.82
linux-image-generic-lpae-hwe-18.04 - 5.0.0.25.82
linux-image-lowlatency-hwe-18.04 - 5.0.0.25.82
linux-image-snapdragon-hwe-18.04 - 5.0.0.25.82
linux-image-virtual-hwe-18.04 - 5.0.0.25.82
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-2019-10126
o CVE-2019-1125
o CVE-2019-12614
o CVE-2019-12984
o CVE-2019-13233
o CVE-2019-13272
o CVE-2019-3846
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