USN-3381-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3381-1

7th August, 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 version:

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2016-8405, CVE-2017-1000365, CVE-2017-2618, CVE-2017-7482