[USN-4157-1] Linux kernel vulnerabilities

Thu Oct 17 02:21:17 UTC 2019

==========================================================================
Ubuntu Security Notice USN-4157-1
October 17, 2019

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux
kernel did not properly perform bounds checking, leading to a heap
overflow. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-14814,
CVE-2019-14815, CVE-2019-14816)

Matt Delco discovered that the KVM hypervisor implementation in the Linux
kernel did not properly perform bounds checking when handling coalesced
MMIO write operations. A local attacker with write access to /dev/kvm could
use this to cause a denial of service (system crash). (CVE-2019-14821)

Hui Peng and Mathias Payer discovered that the 91x Wi-Fi driver in the
Linux kernel did not properly handle error conditions on initialization,
leading to a double-free vulnerability. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2019-15504)

It was discovered that the Technisat DVB-S/S2 USB device driver in the
Linux kernel contained a buffer overread. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information. (CVE-2019-15505)

Brad Spengler discovered that a Spectre mitigation was improperly
implemented in the ptrace susbsystem of the Linux kernel. A local attacker
could possibly use this to expose sensitive information. (CVE-2019-15902)

It was discovered that the IPv6 RDS implementation in the Linux kernel did
not properly initialize fields in a data structure returned to user space.
A local attacker could use this to expose sensitive information (kernel
memory). Please note that the RDS protocol is blacklisted in Ubuntu by
default. (CVE-2019-16714)

It was discovered that an integer overflow existed in the Binder
implementation of the Linux kernel, leading to a buffer overflow. A local
attacker could use this to escalate privileges. (CVE-2019-2181)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.04:
  linux-image-5.0.0-1019-aws      5.0.0-1019.21
  linux-image-5.0.0-1020-kvm      5.0.0-1020.21
  linux-image-5.0.0-1020-raspi2   5.0.0-1020.20
  linux-image-5.0.0-1021-gcp      5.0.0-1021.21
  linux-image-5.0.0-1023-azure    5.0.0-1023.24
  linux-image-5.0.0-1024-snapdragon  5.0.0-1024.25
  linux-image-5.0.0-32-generic    5.0.0-32.34
  linux-image-5.0.0-32-generic-lpae  5.0.0-32.34
  linux-image-5.0.0-32-lowlatency  5.0.0-32.34
  linux-image-aws                 5.0.0.1019.20
  linux-image-azure               5.0.0.1023.22
  linux-image-gcp                 5.0.0.1021.47
  linux-image-generic             5.0.0.32.33
  linux-image-generic-lpae        5.0.0.32.33
  linux-image-gke                 5.0.0.1021.47
  linux-image-kvm                 5.0.0.1020.20
  linux-image-lowlatency          5.0.0.32.33
  linux-image-raspi2              5.0.0.1020.17
  linux-image-snapdragon          5.0.0.1024.17
  linux-image-virtual             5.0.0.32.33

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:
  https://usn.ubuntu.com/4157-1
  CVE-2019-14814, CVE-2019-14815, CVE-2019-14816, CVE-2019-14821,
  CVE-2019-15504, CVE-2019-15505, CVE-2019-15902, CVE-2019-16714,
  CVE-2019-2181

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.0.0-32.34
  https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1019.21
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1023.24
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1021.21
  https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1020.21
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1020.20
  https://launchpad.net/ubuntu/+source/linux-snapdragon/5.0.0-1024.25

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