[USN-3933-2] Linux kernel (Trusty HWE) vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3933-2
April 02, 2019

linux-lts-trusty vulnerabilities
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM

Details:

USN-3933-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
12.04 ESM.

It was discovered that an information leak vulnerability existed in the
Bluetooth implementation of the Linux kernel. An attacker within Bluetooth
range could possibly expose sensitive information (kernel memory).
(CVE-2017-1000410)

It was discovered that the USB serial device driver in the Linux kernel did
not properly validate baud rate settings when debugging is enabled. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2017-18360)

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)

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 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 12.04 ESM:
  linux-image-3.13.0-168-generic  3.13.0-168.218~precise1
  linux-image-3.13.0-168-generic-lpae  3.13.0-168.218~precise1
  linux-image-3.13.0-168-lowlatency  3.13.0-168.218~precise1
  linux-image-generic-lpae-lts-trusty  3.13.0.168.157
  linux-image-generic-lts-trusty  3.13.0.168.157

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/usn/usn-3933-2
  https://usn.ubuntu.com/usn/usn-3933-1
  CVE-2017-1000410, CVE-2017-18360, CVE-2018-19824, CVE-2019-3459,
  CVE-2019-3460, CVE-2019-6974, CVE-2019-7222, CVE-2019-9213

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