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AUSCERT External Security Bulletin Redistribution
ESB-2019.1124
USN-3930-1/2: Linux kernel vulnerabilities
3 April 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-9213 CVE-2019-9162 CVE-2019-9003
CVE-2019-8980 CVE-2019-8956 CVE-2019-8912
CVE-2019-7308 CVE-2019-7222 CVE-2019-7221
CVE-2019-6974 CVE-2019-3460 CVE-2019-3459
CVE-2018-19824
Reference: ESB-2019.1105
ESB-2019.1097
ESB-2019.1081
ESB-2019.1035
ESB-2019.1005
ESB-2019.1004
ESB-2019.0984
ESB-2019.1025.2
ESB-2019.1003.2
Original Bulletin:
https://usn.ubuntu.com/3930-1/
https://usn.ubuntu.com/3930-2/
Comment: This bulletin contains two (2) advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-3930-1: Linux kernel vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.10
Summary
Several security issues were fixed in the Linux kernel.
Software Description
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-raspi2 - Linux kernel for Raspberry Pi 2
Details
Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the
Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2018-19824)
Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak
in the Bluetooth implementation of the Linux kernel. An attacker within
Bluetooth range could use this to expose sensitive information (kernel memory).
(CVE-2019-3459, CVE-2019-3460)
Jann Horn discovered that the KVM implementation in the Linux kernel contained
a use-after-free vulnerability. An attacker in a guest VM with access to /dev/
kvm could use this to cause a denial of service (guest VM crash).
(CVE-2019-6974)
Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the
KVM subsystem of the Linux kernel, when using nested virtual machines. A local
attacker in a guest VM could use this to cause a denial of service (system
crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)
Felix Wilhelm discovered that an information leak vulnerability existed in the
KVM subsystem of the Linux kernel, when nested virtualization is used. A local
attacker could use this to expose sensitive information (host system memory to
a guest VM). (CVE-2019-7222)
Jann Horn discovered that the eBPF implementation in the Linux kernel was
insufficiently hardened against Spectre V1 attacks. A local attacker could use
this to expose sensitive information. (CVE-2019-7308)
It was discovered that a use-after-free vulnerability existed in the user-
space API for crypto (af_alg) implementation in the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-8912)
Jakub Jirasek discovered a use-after-free vulnerability in the SCTP
implementation in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-8956)
It was discovered that the Linux kernel did not properly deallocate memory when
handling certain errors while reading files. A local attacker could use this to
cause a denial of service (excessive memory consumption). (CVE-2019-8980)
It was discovered that a use-after-free vulnerability existed in the IPMI
implementation in the Linux kernel. A local attacker with access to the IPMI
character device files could use this to cause a denial of service (system
crash). (CVE-2019-9003)
Jann Horn discovered that the SNMP NAT implementation in the Linux kernel
performed insufficient ASN.1 length checks. An attacker could use this to cause
a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-9162)
Jann Horn discovered that the mmap implementation in the Linux kernel did not
properly check for the mmap minimum address in some situations. A local
attacker could use this to assist exploiting a kernel NULL pointer dereference
vulnerability. (CVE-2019-9213)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.10
linux-image-4.18.0-1008-gcp - 4.18.0-1008.9
linux-image-4.18.0-1009-kvm - 4.18.0-1009.9
linux-image-4.18.0-1011-raspi2 - 4.18.0-1011.13
linux-image-4.18.0-1012-aws - 4.18.0-1012.14
linux-image-4.18.0-1014-azure - 4.18.0-1014.14
linux-image-4.18.0-17-generic - 4.18.0-17.18
linux-image-4.18.0-17-generic-lpae - 4.18.0-17.18
linux-image-4.18.0-17-lowlatency - 4.18.0-17.18
linux-image-4.18.0-17-snapdragon - 4.18.0-17.18
linux-image-aws - 4.18.0.1012.12
linux-image-azure - 4.18.0.1014.15
linux-image-gcp - 4.18.0.1008.8
linux-image-generic - 4.18.0.17.18
linux-image-generic-lpae - 4.18.0.17.18
linux-image-gke - 4.18.0.1008.8
linux-image-kvm - 4.18.0.1009.9
linux-image-lowlatency - 4.18.0.17.18
linux-image-raspi2 - 4.18.0.1011.8
linux-image-snapdragon - 4.18.0.17.18
linux-image-virtual - 4.18.0.17.18
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-2018-19824
o CVE-2019-3459
o CVE-2019-3460
o CVE-2019-6974
o CVE-2019-7221
o CVE-2019-7222
o CVE-2019-7308
o CVE-2019-8912
o CVE-2019-8956
o CVE-2019-8980
o CVE-2019-9003
o CVE-2019-9162
o CVE-2019-9213
- --------------------------------------------------------------------------------
USN-3930-2: Linux kernel vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-hwe - Linux hardware enablement (HWE) kernel
Details
USN-3930-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.10. This
update provides the corresponding updates for the Linux Hardware Enablement
(HWE) kernel from Ubuntu 18.10 for Ubuntu 18.04 LTS.
Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the
Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2018-19824)
Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak
in the Bluetooth implementation of the Linux kernel. An attacker within
Bluetooth range could use this to expose sensitive information (kernel memory).
(CVE-2019-3459, CVE-2019-3460)
Jann Horn discovered that the KVM implementation in the Linux kernel contained
a use-after-free vulnerability. An attacker in a guest VM with access to /dev/
kvm could use this to cause a denial of service (guest VM crash).
(CVE-2019-6974)
Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the
KVM subsystem of the Linux kernel, when using nested virtual machines. A local
attacker in a guest VM could use this to cause a denial of service (system
crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)
Felix Wilhelm discovered that an information leak vulnerability existed in the
KVM subsystem of the Linux kernel, when nested virtualization is used. A local
attacker could use this to expose sensitive information (host system memory to
a guest VM). (CVE-2019-7222)
Jann Horn discovered that the eBPF implementation in the Linux kernel was
insufficiently hardened against Spectre V1 attacks. A local attacker could use
this to expose sensitive information. (CVE-2019-7308)
It was discovered that a use-after-free vulnerability existed in the user-
space API for crypto (af_alg) implementation in the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-8912)
Jakub Jirasek discovered a use-after-free vulnerability in the SCTP
implementation in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-8956)
It was discovered that the Linux kernel did not properly deallocate memory when
handling certain errors while reading files. A local attacker could use this to
cause a denial of service (excessive memory consumption). (CVE-2019-8980)
It was discovered that a use-after-free vulnerability existed in the IPMI
implementation in the Linux kernel. A local attacker with access to the IPMI
character device files could use this to cause a denial of service (system
crash). (CVE-2019-9003)
Jann Horn discovered that the SNMP NAT implementation in the Linux kernel
performed insufficient ASN.1 length checks. An attacker could use this to cause
a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2019-9162)
Jann Horn discovered that the mmap implementation in the Linux kernel did not
properly check for the mmap minimum address in some situations. A local
attacker could use this to assist exploiting a kernel NULL pointer dereference
vulnerability. (CVE-2019-9213)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04 LTS
linux-image-4.18.0-1014-azure - 4.18.0-1014.14~18.04.1
linux-image-4.18.0-17-generic - 4.18.0-17.18~18.04.1
linux-image-4.18.0-17-generic-lpae - 4.18.0-17.18~18.04.1
linux-image-4.18.0-17-lowlatency - 4.18.0-17.18~18.04.1
linux-image-4.18.0-17-snapdragon - 4.18.0-17.18~18.04.1
linux-image-azure - 4.18.0.1014.13
linux-image-generic-hwe-18.04 - 4.18.0.17.67
linux-image-generic-lpae-hwe-18.04 - 4.18.0.17.67
linux-image-lowlatency-hwe-18.04 - 4.18.0.17.67
linux-image-snapdragon-hwe-18.04 - 4.18.0.17.67
linux-image-virtual-hwe-18.04 - 4.18.0.17.67
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 USN-3930-1
o CVE-2018-19824
o CVE-2019-3459
o CVE-2019-3460
o CVE-2019-6974
o CVE-2019-7221
o CVE-2019-7222
o CVE-2019-7308
o CVE-2019-8912
o CVE-2019-8956
o CVE-2019-8980
o CVE-2019-9003
o CVE-2019-9162
o CVE-2019-9213
- --------------------------END INCLUDED TEXT--------------------
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