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Ubuntu 14.04 LTS USN-3070-4 Critical: Kernel Access Control Issues

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Calendar Grey August 30, 2016
Scroller Ubuntu
Multiple vulnerabilities resolved in the Linux core for Ubuntu, targeting potential exploitation threats and enhancing system efficiency.
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-3070-1 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.

A missing permission check when settings ACLs was discovered in nfsd. A

local user could exploit this flaw to gain access to any file by setting an

ACL. (CVE-2016-1237)

Kangjie Lu discovered an information leak in the Reliable Datagram Sockets

(RDS) implementation in the Linux kernel. A local attacker could use this

to obtain potentially sensitive information from kernel memory.

(CVE-2016-5244)

James Patrick-Evans discovered that the airspy USB device driver in the

Linux kernel did not properly handle certain error conditions. An attacker

with physical access could use this to cause a denial of service (memory

co...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical access control Ubuntu kernel

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-36-generic    4.4.0-36.55~14.04.1
  linux-image-4.4.0-36-generic-lpae  4.4.0-36.55~14.04.1
  linux-image-4.4.0-36-lowlatency  4.4.0-36.55~14.04.1
  linux-image-4.4.0-36-powerpc-e500mc  4.4.0-36.55~14.04.1
  linux-image-4.4.0-36-powerpc-smp  4.4.0-36.55~14.04.1
  linux-image-4.4.0-36-powerpc64-emb  4.4.0-36.55~14.04.1
  linux-image-4.4.0-36-powerpc64-smp  4.4.0-36.55~14.04.1

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-3070-4

https://ubuntu.com/security/notices/USN-3070-1

CVE-2016-1237, CVE-2016-5244, CVE-2016-5400, CVE-2016-5696,

CVE-2016-5728, CVE-2016-5828, CVE-2016-5829, CVE-2016-6197

Severity
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Critical

August 30, 2016

Topics%20covered

Topics Covered

security advisory denial of service critical access control Ubuntu kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-36.55~14.04.1

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