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AUSCERT External Security Bulletin Redistribution
ESB-2019.0691
Linux kernel vulnerabilities
6 March 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Increased Privileges -- Existing Account
Access Privileged Data -- Existing Account
Modify Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6133 CVE-2018-19854 CVE-2018-18397
Reference: ESB-2019.0670
ESB-2019.0609
ESB-2019.0291
ESB-2019.0231
Original Bulletin:
https://usn.ubuntu.com/3901-1/
https://usn.ubuntu.com/3901-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-3901-1: Linux kernel vulnerabilities
5 March 2019
linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle, linux-raspi2
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 - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-kvm - Linux kernel for cloud environments
o linux-oem - Linux kernel for OEM processors
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi2 - Linux kernel for Raspberry Pi 2
Details
Jann Horn discovered that the userfaultd implementation in the Linux kernel did
not properly restrict access to certain ioctls. A local attacker could use this
possibly to modify files. (CVE-2018-18397)
It was discovered that the crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2018-19854)
Jann Horn discovered a race condition in the fork() system call in the Linux
kernel. A local attacker could use this to gain access to services that cache
authorizations. (CVE-2019-6133)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1009-oracle - 4.15.0-1009.11
linux-image-4.15.0-1028-gcp - 4.15.0-1028.29
linux-image-4.15.0-1030-kvm - 4.15.0-1030.30
linux-image-4.15.0-1032-raspi2 - 4.15.0-1032.34
linux-image-4.15.0-1033-aws - 4.15.0-1033.35
linux-image-4.15.0-1034-oem - 4.15.0-1034.39
linux-image-4.15.0-46-generic - 4.15.0-46.49
linux-image-4.15.0-46-generic-lpae - 4.15.0-46.49
linux-image-4.15.0-46-lowlatency - 4.15.0-46.49
linux-image-4.15.0-46-snapdragon - 4.15.0-46.49
linux-image-aws - 4.15.0.1033.32
linux-image-gcp - 4.15.0.1028.30
linux-image-generic - 4.15.0.46.48
linux-image-generic-lpae - 4.15.0.46.48
linux-image-gke - 4.15.0.1028.30
linux-image-kvm - 4.15.0.1030.30
linux-image-lowlatency - 4.15.0.46.48
linux-image-oem - 4.15.0.1034.39
linux-image-oracle - 4.15.0.1009.12
linux-image-raspi2 - 4.15.0.1032.30
linux-image-snapdragon - 4.15.0.46.48
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-2018-18397
o CVE-2018-19854
o CVE-2019-6133
================================================================================
USN-3901-2: Linux kernel (HWE) vulnerabilities
5 March 2019
linux-hwe, linux-aws-hwe, linux-azure, linux-gcp, linux-oracle vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 16.04 LTS
o Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
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-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
o linux-oracle - Linux kernel for Oracle Cloud systems
Details
USN-3901-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This
update provides the corresponding updates for the Linux Hardware Enablement
(HWE) kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS.
Jann Horn discovered that the userfaultd implementation in the Linux kernel did
not properly restrict access to certain ioctls. A local attacker could use this
possibly to modify files. (CVE-2018-18397)
It was discovered that the crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2018-19854)
Jann Horn discovered a race condition in the fork() system call in the Linux
kernel. A local attacker could use this to gain access to services that cache
authorizations. (CVE-2019-6133)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04 LTS
linux-image-4.15.0-1009-oracle - 4.15.0-1009.11~16.04.1
linux-image-4.15.0-1028-gcp - 4.15.0-1028.29~16.04.1
linux-image-4.15.0-1033-aws - 4.15.0-1033.35~16.04.1
linux-image-4.15.0-1040-azure - 4.15.0-1040.44
linux-image-4.15.0-46-generic - 4.15.0-46.49~16.04.1
linux-image-4.15.0-46-generic-lpae - 4.15.0-46.49~16.04.1
linux-image-4.15.0-46-lowlatency - 4.15.0-46.49~16.04.1
linux-image-aws-hwe - 4.15.0.1033.34
linux-image-azure - 4.15.0.1040.44
linux-image-gcp - 4.15.0.1028.42
linux-image-generic-hwe-16.04 - 4.15.0.46.67
linux-image-generic-lpae-hwe-16.04 - 4.15.0.46.67
linux-image-gke - 4.15.0.1028.42
linux-image-lowlatency-hwe-16.04 - 4.15.0.46.67
linux-image-oem - 4.15.0.46.67
linux-image-oracle - 4.15.0.1009.3
Ubuntu 14.04 LTS
linux-image-4.15.0-1040-azure - 4.15.0-1040.44~14.04.1
linux-image-azure - 4.15.0.1040.27
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-3901-1
o CVE-2018-18397
o CVE-2018-19854
o CVE-2019-6133
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