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Ubuntu 14.04 LTS USN-3234-2: Moderate Level Kernel Denial Of Service

ubuntu
Calendar Grey March 15, 2017
Dist Ubuntu Esm H88
Patch released for Ubuntu 14.04 LTS targeting kernel vulnerabilities linked to denial of service and privilege escalation threats.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3234-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu

14.04 LTS.

Ralf Spenneberg discovered that the ext4 implementation in the Linux kernel

did not properly validate meta block groups. An attacker with physical

access could use this to specially craft an ext4 image that causes a denial

of service (system crash). (CVE-2016-10208)

It was discovered that the Linux kernel did not clear the setgid bit during

a setxattr call on a tmpfs filesystem. A local attacker could use this to

gain elevated group privileges. (CVE-2017-5551)

Topics%20covered

Topics Covered

security advisory denial of service privilege escalation kernel ubuntu linux patch

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-67-generic    4.4.0-67.88~14.04.1
  linux-image-4.4.0-67-generic-lpae  4.4.0-67.88~14.04.1
  linux-image-4.4.0-67-lowlatency  4.4.0-67.88~14.04.1
  linux-image-4.4.0-67-powerpc-e500mc  4.4.0-67.88~14.04.1
  linux-image-4.4.0-67-powerpc-smp  4.4.0-67.88~14.04.1
  linux-image-4.4.0-67-powerpc64-emb  4.4.0-67.88~14.04.1
  linux-image-4.4.0-67-powerpc64-smp  4.4.0-67.88~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.67.54
  linux-image-generic-lts-xenial  4.4.0.67.54
  linux-image-lowlatency-lts-xenial  4.4.0.67.54
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.67.54
  linux-image-powerpc-smp-lts-xenial  4.4.0.67.54
  linux-image-powerpc64-emb-lts-xenial  4.4.0.67.54
  linux-image-powerpc64-smp-lts-xenial  4.4.0.67.54

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://ubuntu.com/security/notices/USN-3234-2

https://ubuntu.com/security/notices/USN-3234-1

CVE-2016-10208, CVE-2017-5551

March 15, 2017

Topics%20covered

Topics Covered

security advisory denial of service privilege escalation kernel ubuntu linux patch

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-67.88~14.04.1

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