[USN-3381-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3381-1
August 07, 2017

linux vulnerabilities
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

Peter Pi discovered that the colormap handling for frame buffer devices in
the Linux kernel contained an integer overflow. A local attacker could use
this to disclose sensitive information (kernel memory). (CVE-2016-8405)

It was discovered that the Linux kernel did not properly restrict
RLIMIT_STACK size. A local attacker could use this in conjunction with
another vulnerability to possibly execute arbitrary code.
(CVE-2017-1000365)

It was discovered that SELinux in the Linux kernel did not properly handle
empty writes to /proc/pid/attr. A local attacker could use this to cause a
denial of service (system crash). (CVE-2017-2618)

石磊 discovered that the RxRPC Kerberos 5 ticket handling code in the
Linux kernel did not properly verify metadata. A remote attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-7482)

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-126-generic  3.13.0-126.175
  linux-image-3.13.0-126-generic-lpae  3.13.0-126.175
  linux-image-3.13.0-126-lowlatency  3.13.0-126.175
  linux-image-3.13.0-126-powerpc-e500  3.13.0-126.175
  linux-image-3.13.0-126-powerpc-e500mc  3.13.0-126.175
  linux-image-3.13.0-126-powerpc-smp  3.13.0-126.175
  linux-image-3.13.0-126-powerpc64-emb  3.13.0-126.175
  linux-image-3.13.0-126-powerpc64-smp  3.13.0-126.175
  linux-image-generic             3.13.0.126.136
  linux-image-generic-lpae        3.13.0.126.136
  linux-image-lowlatency          3.13.0.126.136
  linux-image-powerpc-e500        3.13.0.126.136
  linux-image-powerpc-e500mc      3.13.0.126.136
  linux-image-powerpc-smp         3.13.0.126.136
  linux-image-powerpc64-emb       3.13.0.126.136
  linux-image-powerpc64-smp       3.13.0.126.136

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://www.ubuntu.com/usn/usn-3381-1
  CVE-2016-8405, CVE-2017-1000365, CVE-2017-2618, CVE-2017-7482

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.13.0-126.175

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