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Test ID:1.3.6.1.4.1.25623.1.0.844235
Category:Ubuntu Local Security Checks
Title:Ubuntu Update for linux USN-4184-2
Summary:The remote host is missing an update for the 'linux'; package(s) announced via the USN-4184-2 advisory.
Description:Summary:
The remote host is missing an update for the 'linux'
package(s) announced via the USN-4184-2 advisory.

Vulnerability Insight:
USN-4184-1 fixed vulnerabilities in the Linux kernel. It was discovered
that the kernel fix for CVE-2019-0155 (i915 missing Blitter Command
Streamer check) was incomplete on 64-bit Intel x86 systems. Also, the
update introduced a regression that broke KVM guests where extended
page tables (EPT) are disabled or not supported. This update addresses
both issues.

We apologize for the inconvenience.

Original advisory details:

Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo,
Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz
Lipp, Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel
processors using Transactional Synchronization Extensions (TSX) could
expose memory contents previously stored in microarchitectural buffers to a
malicious process that is executing on the same CPU core. A local attacker
could use this to expose sensitive information. (CVE-2019-11135)

It was discovered that the Intel i915 graphics chipsets allowed userspace
to modify page table entries via writes to MMIO from the Blitter Command
Streamer and expose kernel memory information. A local attacker could use
this to expose sensitive information or possibly elevate privileges.
(CVE-2019-0155)

Deepak Gupta discovered that on certain Intel processors, the Linux kernel
did not properly perform invalidation on page table updates by virtual
guest operating systems. A local attacker in a guest VM could use this to
cause a denial of service (host system crash). (CVE-2018-12207)

It was discovered that the Intel i915 graphics chipsets could cause a
system hang when userspace performed a read from GT memory mapped input
output (MMIO) when the product is in certain low power states. A local
attacker could use this to cause a denial of service. (CVE-2019-0154)

Hui Peng discovered that the Atheros AR6004 USB Wi-Fi device driver for the
Linux kernel did not properly validate endpoint descriptors returned by the
device. A physically proximate attacker could use this to cause a denial of
service (system crash). (CVE-2019-15098)

Jann Horn discovered a reference count underflow in the shiftfs
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-2019-15791)

Jann Horn discovered a type confusion vulnerability in the shiftfs
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-2019-15792)

Jann Horn discovered that the shiftfs implementation in the Linux kernel
did ...

Description truncated. Please see the references for more information.

Affected Software/OS:
'linux' package(s) on Ubuntu 19.04, Ubuntu 18.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
8.3

CVSS Vector:
AV:A/AC:L/Au:N/C:C/I:C/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-0155
Bugtraq: 20191118 [slackware-security] Slackware 14.2 kernel (SSA:2019-320-01) (Google Search)
https://seclists.org/bugtraq/2019/Nov/26
http://packetstormsecurity.com/files/155375/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00242.html
RedHat Security Advisories: RHSA-2019:3841
https://access.redhat.com/errata/RHSA-2019:3841
RedHat Security Advisories: RHSA-2019:3887
https://access.redhat.com/errata/RHSA-2019:3887
RedHat Security Advisories: RHSA-2019:3889
https://access.redhat.com/errata/RHSA-2019:3889
RedHat Security Advisories: RHSA-2019:3908
https://access.redhat.com/errata/RHSA-2019:3908
RedHat Security Advisories: RHSA-2020:0204
https://access.redhat.com/errata/RHSA-2020:0204
https://usn.ubuntu.com/4186-2/
Common Vulnerability Exposure (CVE) ID: CVE-2019-0154
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00260.html
CopyrightCopyright (C) 2019 Greenbone Networks GmbH

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