what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

Ubuntu Security Notice USN-3777-3

Ubuntu Security Notice USN-3777-3
Posted Oct 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3777-3 - USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 %LTS. This update provides the corresponding updates for the Linux kernel for Azure Cloud systems. Jann Horn discovered that the vmacache subsystem did not properly handle sequence number overflows, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594, CVE-2018-17182, CVE-2018-3639, CVE-2018-6554, CVE-2018-6555
SHA-256 | 769cc3a35204cab453698f34a6b0570d79e3ff0a88450698a2577c0e6fc6a664

Ubuntu Security Notice USN-3777-3

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3777-3
October 23, 2018

linux-azure vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
%LTS. This update provides the corresponding updates for the
Linux kernel for Azure Cloud systems.

Jann Horn discovered that the vmacache subsystem did not properly handle
sequence number overflows, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

Jann Horn discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory. (CVE-2017-5715)

It was discovered that a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory reads
via a sidechannel attack. This flaw is known as Spectre Variant 4. A local
attacker could use this to expose sensitive information, including kernel
memory. (CVE-2018-3639)

It was discovered that a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1025-azure 4.15.0-1025.26
linux-image-azure 4.15.0.1025.25

Ubuntu 16.04 LTS:
linux-image-4.15.0-1025-azure 4.15.0-1025.26~16.04.1
linux-image-azure 4.15.0.1025.31

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-3777-3
https://usn.ubuntu.com/usn/usn-3777-1
CVE-2017-5715, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,
CVE-2018-17182, CVE-2018-3639, CVE-2018-6554, CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1025.26
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1025.26~16.04.1

Login or Register to add favorites

File Archive:

February 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    16 Files
  • 2
    Feb 2nd
    19 Files
  • 3
    Feb 3rd
    0 Files
  • 4
    Feb 4th
    0 Files
  • 5
    Feb 5th
    24 Files
  • 6
    Feb 6th
    2 Files
  • 7
    Feb 7th
    10 Files
  • 8
    Feb 8th
    25 Files
  • 9
    Feb 9th
    37 Files
  • 10
    Feb 10th
    0 Files
  • 11
    Feb 11th
    0 Files
  • 12
    Feb 12th
    17 Files
  • 13
    Feb 13th
    20 Files
  • 14
    Feb 14th
    25 Files
  • 15
    Feb 15th
    15 Files
  • 16
    Feb 16th
    6 Files
  • 17
    Feb 17th
    0 Files
  • 18
    Feb 18th
    0 Files
  • 19
    Feb 19th
    35 Files
  • 20
    Feb 20th
    25 Files
  • 21
    Feb 21st
    18 Files
  • 22
    Feb 22nd
    0 Files
  • 23
    Feb 23rd
    0 Files
  • 24
    Feb 24th
    0 Files
  • 25
    Feb 25th
    0 Files
  • 26
    Feb 26th
    0 Files
  • 27
    Feb 27th
    0 Files
  • 28
    Feb 28th
    0 Files
  • 29
    Feb 29th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close